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} | 1,694 | Cellular respiration Essays
• Cellular Respiration
664 Words | 3 Pages
Demonstration of Cellular Respiration of a celery cell in vivo. Purpose Cellular respiration is a metabolic process consisting of a series of oxidation reactions in which oxygen is utilized and therefore is called an aerobic reaction. The process of cellular respiration takes place in the mitochondria, located in the cell of an organism and which converts biochemical energy from nutrients into adenosine triphosphate (ATP), and then releases waste products. The mitochondria is surrounded by two
• Cellular Respiration Lab
478 Words | 2 Pages
Cellular Respiration Lab Introduction In this lab, the primary investigation was to discover which factors affect cellular respiration. In this particular inquiry, the factor tested was the amount of time the lentil seeds were germinated. This study was performed in order to understand the process of cellular respiration as well as be able to measure and observe gas concentration as a result of impacting factors. Cellular respiration is necessary for life-processes, converting glucose and oxygen
• Photosynthesis And Cellular Respiration Relationship
455 Words | 2 Pages
relationship between Photosynthesis and Cellular Respiration is that the reactants on photosynthesis are the products to cellular respiration, and the products of photosynthesis are the reactant. Photosynthesis removes carbon dioxide from the atmosphere while cellular respiration puts it back into the atmosphere. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses that oxygen to release energy from food. Cellular respiration and photosynthesis differ because they occur
• Cellular Respiration And Photosynthesis Essay
1872 Words | 8 Pages
Photosynthesis and Respiration: Cellular respiration and photosynthesis are the two main processes carry out by most living organisms to attain energy. Whereas photosynthesis is performed by most plants that can make their own food, most animals achieve their energy necessities through cellular respiration. Photosynthesis: Light-dependent Reactions and Light-independent Reactions or dark reactions or Calvin Cycle are the stages of chemical reactions during the process of photosynthesis. Light Reactions:
• Three Stages In Cellular Respiration
744 Words | 3 Pages
Cellular respiration There are three stages in cellular respiration: Glycolysis, the Krebs cycle and the electron transport chain. The equation for cellular respiration is: C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP Glycolysis Glycolysis is multiple reactions that gain energy from glucose by splitting the glucose into 3 carbon molecules (Pyruvates). (Mason et al., 2016) Glycolysis is anaerobic meaning it doesn’t require any oxygen to be carried out. This is because energy can be made through
• Cellular Respiration Essay Examples
742 Words | 3 Pages
Cellular Respiration: The Soul of Energy On a warm summer day in England, a boy named Ciel was writing letters. After the letters were finished, Ciel went to the kitchen to get a drink of tea. Little did he know, that when he drank the tea a three-staged process called Cellular Respiration was taking place in his body. Cellular Respiration is a process that converts energy, like glucose, into carbon dioxide and water, that is necessary for the functions of life. Cellular Respiration also includes
• Breathing And Cellular Respiration Essay
808 Words | 4 Pages
cells (erythrocytes) which pass on the oxygen onto cells which require and utilise the oxygen, during aerobic respiration, to produce energy in the form of ATP. This biochemical reaction produces carbon dioxide as a waste product, and it is transported, using the red blood cells (RBCs), back to the lungs and exhaled. Figure 1 shows the relationship between breathing and cellular respiration, with the two connected by the gas carrying red blood cells. Notice the requirement for oxygen by the cells
• Compare And Contrast Cellular Respiration And Photosynthesis
420 Words | 2 Pages
photosynthesis and cellular respiration are extremely important in the cycle of energy to sustain life simply because nutrients would not metabolize in a productive manner. Both have numerous stages in which the process of energy occurs, and relationships with organelles located in the eukaryotic cell. Photosynthesis is a process by which green plant and other organism manufacture their food using sunlight to synthesize foods from carbon dioxide and water while cellular respiration is the oxidation
• Cellular Respiration In Yeast Lab Report
780 Words | 4 Pages
Production by Cellular Respiration in Yeast Introduction In this lab, our main focus was to find how sugar concentration affect yeast respiration rates. This was to simulate the process of cellular respiration. Cellular respiration is the process that cells use to transfer energy from the organic molecules in food to ATP (Adenosine Tri-Phosphate). Glucose, CO2, and yeast (used as a catalyst in this experiment) are a few of the many vital components that contribute to cellular respiration. Sugar/ glucose
• Similarities Between Photosynthesis And Cellular Respiration
520 Words | 3 Pages
Photosynthesis and cellular respiration are processes that help human beings live. The reactants in photosynthesis are carbon dioxide, water, and the sunlight’s energy. The products of these reactants are glucose and oxygen. Photosynthesis takes place in the chloroplasts in only plant cells. This is when plants convert carbon dioxide and water into glucose by using the sun’s energy. The two reactants in cellular respiration are glucose and oxygen. Cellular respiration has three products as a result
• Similarities Between Cellular Respiration And Photosynthesis
429 Words | 2 Pages
What are the similarities and difference between cellular respiration, fermentation, and photosynthesis? Well, cellular respiration is a series of chemical reactions that convert into energy in food molecules into a usable form of energy called ATP. Fermentation is a reaction that eukaryotic and prokaryotic cells can use to obtain energy from food when oxygen levels are low. Photosynthesis is a series of chemical reactions that convert light energy, water, and CO2 into the food-energy molecule glucose
• Four Stages Of Cellular Respiration Essay
568 Words | 3 Pages
Four Stages of Cellular Respiration Cellular respiration is one of the metabolic pathways most elegant, solemn and magnificent on the ground. At the same time, it 's also one of the most complicated. When I learned about it for the first time, I felt like I had stumbled and fell tray alphabet soup flavored organic chemistry! Fortunately, cellular respiration is not so scary once you get to know it. In this paper I will look at the cellular respiration to a high standard, and a walk through four
• Cellular Respiration In Yeast Research Paper
732 Words | 3 Pages
Figure4 - the chemical structure of sucrose. Figure5 - the chemical structure of lactose. Cellular respiration is when food molecules like glucose are oxidised to form carbon dioxide and water. Adenosine triphosphate is created by a catabolic pathway to be used by the cell. Cellular respiration happens in both eukaryotic and prokaryotic cells. The three main stages of cellular respiration: 1.Glycolysis - this is the splitting of sugars. It has glucose, a 6 carbon sugar is separated into
• Essay On Cellular Respiration
2003 Words | 9 Pages
Cellular Respiration Aerobic Cellular Respiration is the process by which the cells in our body get energy to carry out their functions. Cellular respiration is necessary for all living things due to the fact that living things are made up of cells and all cells need energy to carry out their functions. It takes place in the mitochondria of mainly eukaryotic cells. Mitochondria are considered the powerhouses of cells due to their high folds of energy. During aerobic respiration, oxygen is always
• Cellular Respiration Essay
897 Words | 4 Pages
Cellular respiration is how heterotrophs turn food consumed into useable energy. Cellular respiration is broken down into four phases, the first one being Glycolysis. Glycolysis takes place in the cytoplasm and is the only anaerobic process in cellular respiration. Glycolysis starts with a 6 carbon molecule called glucose. Two ATP are then added to the reaction which forms two ADP to be recycled, and two phosphate molecules added onto your 6 carbon glucose. The energy added also splits the 6 carbon
• Cellular Respiration Experiment
968 Words | 4 Pages
Exercise Intensity on Cellular Respiration measured through Heart Rate and CO2 Production Background Research Cellular Respiration: C6H12O6 + 6O2 >>> 6H2O + 6CO2 + 36 ATP When examining the effects of exercise on cellular respiration, we can assess three main bodily functions: carbon dioxide production, heart rate and breathing rate, all telling us of an increase in cellular respiration. We can only directly measure the CO2 output that is a direct result of cellular respiration, we can use all of
• Cellular Respiration Research Paper
1393 Words | 6 Pages
Cellular Respiration One of the main essentials of life that all organisms need in order to function in our world is, energy. We receive that energy from the food that we eat. Cellular respiration is the most efficient way for a cell to receive the energy stored in food. In cellular respiration, a catabolic pathway, which breaks down the molecules into smaller units, in order to produce adenosine triphosphate, also known as, ATP. ATP, is used by cells in the act of regular cellular operations, it
• Cellular Respiration Lab Report
1079 Words | 5 Pages
Cell Respiration Lab Research Question What is the optimal temperature for germinating pea-seeds where the rate of respiration is the greatest? Background Information Cell Respiration refers to the biochemical process conducted by the cells of an organism that combines glucose and oxygen to produce energy in the form of ATP, along with two by-products, water and carbon dioxide. The equation representing this chemical reaction is shown below. C6H12O6 + 6 O2 6 CO2 + 6 H2O + ATP Although plants and
• Tc Cycle Essay
1788 Words | 8 Pages
citric acids. However series of reactions known as tricarboxylic acids (TCA) cycles, for three carboxyl groups on its primary 2 intermediates or the kreb cycles, after its discoverer Hans Krebs. Whatever citric cycles is a central driver of cellular respirations, it obtains acetyl co-A produced by the oxidation of pyruvate and originally derived from glucose as its starting material and in a series of redox reactions. Gather a large amount of it is bond energy in form of NADH,
• Essay On Aerobic Cellular Photosynthesis
902 Words | 4 Pages
Aerobic cellular respiration and oxygenic photosynthesis are the main pathways of energy flowing in living things. Photosynthesis is known as a process that is used by plants, algae and bacteria get energy from sunlight into chemical energy. Aerobic cellular respiration makes ATP, finalizes e- acceptor is oxygen. Aerobic cellular respiration involves the products of photosynthesis, which are glucose and oxygen, while photosynthesis uses the products in aerobic cellular, which are carbon dioxide and | https://www.ipl.org/topics/cellular-respiration | isPartOf: CC-MAIN-2022-05
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Cellular Respiration
Researchers link digestive tract Researchers link digestive tract cancer to cell oxygen deficiency The enzyme succinate dehydrogenase processes oxygen to supply energy to the cell. It is embedded in the outer membrane of mitochondria, cellular structures which supply energy to the cell. The researchers found that some patients with GIST (Gastrointestinal stromal tumor) had mutations in the genes for the B and C subunits of the enzyme. Cancer of the digestive tract is linked to a shutdown in an enzyme – succinate dehydrogenase, that helps supply oxygen to cells. Let's explore more about cellular respiration and its importance.
Learning Objectives
After completing the topic, the student will be able to:
• Predict what happens if cell does not undergo cellular respiration and appreciate the importance of this phenomenon.
• Define cellular respiration and understand the basic principles of it.
• Understand how catabolic pathways yield energy by oxidizing organic fuels.
• Define and describe the terms – glycolysis, citric acid cycle and electron transport chain.
• Understand and explore the basic principles of oxidation and reduction (redox reactions).
• Examine how glycolysis harvests chemical energy by oxidizing glucose to pyruvate.
• Evaluate how citric acid cycle completes the energy‐yielding oxidation of organic molecules.
• Examine how during oxidative phosphorylation, chemiosmosis couples electron transport to ATP synthesis.
Living cells Living cells require energy from outside sources The giant panda in this figure obtains energy for its cells by eating plants
Cellular Respiration
Cellular respiration is the set of the metabolic reactions and processes that occurs in the cells of living organisms for conversion of biochemical energy from nutrients into adenosine triphosphate (ATP), and then release of waste products.
The reactions of respiration include catabolic reactions, which break large molecules into smaller ones, releasing energy. Respiration is one of the key ways where a cell gains useful energy for its cellular activity. Cellular respiration is considered an exothermic redox reaction chemically, but technically, cellular respiration is a combustion reaction.
We all need energy to function and we get this energy from food we eat. The most efficient way for cells to harvest energy stored in food is through cellular respiration, a catabolic pathway for the production of adenosine triphosphate (ATP).
ATP, a high energy molecule, is expended by working cells. Cellular respiration occurs both in prokaryotic cells and eukaryotic cells. Living cells require transfusions of energy from outside sources to perform their many tasks– for example, assembling polymers, pumping substances across membranes, moving and reproducing.
Cellular respiration- Citric acid cycle One of the key pathways in Cellular respiration- Citric acid cycle Citric acid cycle – The biochemical hub of the cell
Mechanism of cellular respiration
The energy stored in the organic molecules of food ultimately comes from the sun. During process of respiration, the whole of energy contained in respiratory substrates is not released all at the time. It is released slowly in several steps of reactions controlled by different enzymes.
As we know, important life processes, such as synthesis of proteins, fats and carbohydrates, require a certain expenditure of energy. Where does this energy come from, how is it stored, and how is it made available to the living cell, are some of the questions, which are to be answered by process of respiration. The reaction that occurs in common respiration of glucose may be summed up as follows:
Glucose + Oxygen Carbon Dioxide + Water + Energy
C6H12O6+6O2 6CO2+6H2O+Energy
In this chapter, we consider how cells harvest the chemical energy stored in organic molecules and use it to generate ATP, the molecule that drives most cellular work. After presenting some basics about respiration, we will focus on the three key pathways of respiration: Glycolysis, the Citric acid cycle, and oxidative phosphorylation.
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Many organisms perform cellular respiration, including animals, bacteria, fungi and protozoa, according to CliffsNotes. These organisms use carbohydrates derived from plants to acquire the energy they need to carry out metabolic processes.
In organisms that perform cellular respiration, the cells store carbohydrates in their cytoplasm and disintegrate the carbohydrates to obtain energy, explains CliffsNotes. This energy is essential in combining adenosine diphosphate and phosphate ions to create adenosine triphosphate molecules, which serve as a power source for cellular processes that require energy.
Cellular respiration involves glycolysis, which is the process that breaks down glucose molecules to produce pyruvic acid molecules, states CliffsNotes. Another part of cellular respiration is the Krebs cycle, wherein the energy derived from the molecule of pyruvic acid is used to create high-energy compounds. The electron transport system delivers electrons through coenzymes and cytochromes, leading to the release of the energy in electrons. Cellular respiration also involves chemiosmosis, wherein electrons provide energy for ATP synthesis.
Cellular respiration and photosynthesis are interrelated, because cellular respiration requires oxygen to receive electrons, and photosynthesis produces oxygen, notes CliffsNotes. Plants acquire energy from sunlight and provide energy in the form of adenosine triphosphate for cellular processes. Cellular respiration produces carbon dioxide, which is a metabolic waste product that plants need for photosynthesis. Through photosynthesis, plants create carbohydrates, thus repeating the cycle. | https://www.reference.com/science/organisms-perform-cellular-respiration-f3c3062d03f494de | isPartOf: CC-MAIN-2019-47
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Ap Bio Cellular Respiration Answer AP Bio Questions On Cellular Energetics. Please Help?
AP Bio questions on Cellular Energetics. Please help? - ap bio cellular respiration answer
I need help with some questions that I for HW. It would be great if some of you can help me to serve some of these reactions.
What is the role of ATP in coupling of anabolic and catabolic processes of the cell?
How Chemiosmosis in bioenergetics?
As organic molecules are broken down by catabolic pathways?
What is the role of oxygen in the process of energy production?
How cells create ATP without oxygen?
How does photosynthesis convert light into chemical energy?
What is the difference between absorption spectra and action?
Compare and C4, C3 and CAM photosynthesis.
As the chemical reactions that case, the light on the synthesis of carbohydrates are linked?
What kind of photosYNTHETIC adjustments in response to different environmental conditions develop?
What interactions exist between photosynthesis and cellular respiration?
Describe the process of anaerobic and aerobic respiration.
What affects rates of respiration and photosynthesis?
Erebos said...
catabolic process of releasing energy, which can ATP, which can be used as energy for the propelling energy demanding anabolic processes that are recognized
be broken, enzymatically ... Not sure what is the question
Oxygen acts as a final electron acceptor
Alcohol fermentation, yeast, for example, and the formation of lactic acid in humans. Both processes are necessary to glycolysis drive, do not need the oxygen
Light energy is used to promote electrons to higher energy levels. the electrons fall back on the ground is the state, with the pumping of protons across a membrane electrochemical gradient used by ATP synthase, ATP-production to create the
specific absorption spectrumPhotons absorbed by a compound to promote electrons to higher energy levels. Not sure what you mean by action spectra
There are too many things to say about plants C4/C3. I suggest you read about yourself
NADPH produced by the reactions of light (and ATP) is used for the synthesis of carbohydrates in the Calvin cycle
Well, if you see more C3/C4/cam plants, as everyone has adapted its own environment. The biggest problem we face is that they open their pores so that oxygen does not enter but at the same time, the water from the leaves need. each approaches the problem differently
Carbohydrates can be produced by photosynthesis are used by the respiration
aerobic oxidative phosphorylation requires oxygen, either in orand transporting the chain of electrons. Anaerobic not: namely, glycolysis
In general, the amount of funding: carbohydrates, a source of light, oxygen. In addition to regulating various hormones in the body. Regulate, for example, in mammals and glucagon inuslin respiratory rate
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Photosynthesis and aerobic respiration are both part of a cyclic process of biochemical reactions. Photosynthesis requires the products of aerobic respiration (carbon dioxide and water), while aerobic respiration requires the products of photosynthesis (glucose and oxygen). Together, these reactions are involved in how cells make and store energy. The energy transfers in both processes and in how the gas exchange between oxygen and carbon dioxide occurs and the end products that result from each process are somewhat opposite processes, thus aerobic respiration and photosynthesis are in some ways complete opposites of each other. Photosynthetic organisms such as plants use solar energy to reduce carbon dioxide into carbohydrates. During respiration glucose is oxidised back to carbon dioxide, in the process, releasing energy that is captured in the bonds of ATP. Although these two energy producing processes differ in their uses and also their goals, they do have several similarities.
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Photosynthesis can be summed up by the following equation
Cellular respiration is the process of oxidising food molecules or breaking down chemical bonds of glucose into carbon dioxide and water. The energy released in the process is trapped in the form of ATP and used by different energy consuming activities of the cell. It is a set of metabolic reactions that unlike photosynthesis which occurs in the chloroplast, cellular respiration occurs in the mitochondria. The complete breakdown of glucose into carbon dioxide and water involves two major steps: glycolysis and aerobic respiration. Glycolysis is the anaerobic catabolism of glucose that occurs in all the cells and produces two molecules of ATP.Aerobic respiration is the process in which the pyruvate molecules produced by glycolysis undergoes further breakdown in the presence of oxygen and generates thirty four molecules of ATP.
This reaction can be described as follows:
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Outlined above are the main differences between the two processes. However, photosynthesis and cellular respiration are two processes that both involve electron transport chains and they both affect concentrations of carbon dioxide and oxygen in the atmosphere. Both photosynthesis and cellular respiration provide energy to the organism's cells.
It is interesting to note the structural similarities between Chlorophyll, that plays an important role in photosynthesis and Haemoglobin that is involved in cellular respiration. Both structures are practically identical except for the fact that haemoglobin has a central Iron atom and chlorophyll possesses a central Magnesium atom. Haemoglobin is a protein that carries oxygen in the blood. Where chlorophyll is known for its green pigment, haemoglobin is known for its deep red pigment. (Fig3 illustrates structural
To conclude from this, photosynthesis and cellular respiration are the most vital biochemical pathways to life. They both include cycles, stages and many enzymes to function. Although their similarities can be easily recognised, it is their differences that make them stand apart as opposite processes. Photosynthesis requiring light in order to produce its end product, carbohydrate, and cellular respiration requiring carbohydrate in order to produce its end product energy. | https://www.ukessays.com/essays/biology/photosynthesis-and-aerobic-respiration.php | robots: classic
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} | 310 | 10 Difference between Cellular Respiration and Photosynthesis
Respiration is a complex process which includes absorption of oxygen, conversion of complex substance like carbohydrates to carbon dioxide and water with release of energy as ATP to drive all cellular activities and as a result there is loss of weight. Where as in photosynthesis complex carbohydrates are built up from simpler substances like carbon dioxide and water with the release of oxygen. Thus respiration is altogether is a reverse process of photosynthesis.
Respiration vs Photosynthesis
Respiration vs Photosynthesis
It takes place only in chlorophyllous cells
It occurs in light and dark, both conditions
It occurs only in light
• Glycolysis: in cytoplasm
• Citric acid cycle or Krebs cycle: mitochondrial matrix
• Electron transport chain and oxidative phosphorylation: in inner mitochondrial membrane
• Light reaction: grana of chloroplast
• Water splitting complex or photolysis: thylakoid lumen
Oxygen is utilized and carbon dioxide and water are formed.
C6H12O6 + 6O2-> 6CO2 + 6 H2O+ energy
Carbon dioxide and water are used while oxygen is evolved.
6CO2 + 12H2O -> C6H12O6 + 6H2O+ 6O2
It is a catabolic process and includes the destruction of stored food
It is an anabolic process and includes the manufacture food
Oxygen is absorbed in the process
Oxygen is liberated
Carbohydrates are oxidised
Carbohydrates are synthesised
Energy is liberated in the form of ATP.
Dry weight of plants decreases
Dry weight of plants increases
Oxidative phosphorylation occurs
Photophosphorylation occurs
During the process, potential energy is converted to kinetic energy.
Light energy is converted into potential energy | https://www.majordifferences.com/2013/03/difference-between-respiration-and.html | isPartOf: CC-MAIN-2020-29
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Chemistry LibreTexts
9.2: Introduction to Photosynthesis
• Page ID
• In biology, energy is needed in order to drive all sorts of biochemical processes. Energy is needed to stay alive. There are plenty of energy sources on earth. Tectonic forces release massive amounts of heat and drive the conversion of some minerals into gaseous products; for example, metal sulfides such as zincblende can be converted to gaseous hydrogen sulfide, H2S. Sometimes, all that heat and gas finds its way to the earth's surface in the form of volcanoes. In the oceans, some marine organisms get their energy from gases released from volcanic vents, such as methane and hydrogen sulfide. However, sunlight is an even more abundant source of energy over most of the earth's surface. In photosynthesis, light energy is absorbed and used to make ATP. Remember, ATP is like a portable battery pack in biology; it can travel to different parts of a cell where it can be used to power uphill steps in biochemical reactions.
Figure \(\PageIndex{1}\): Absorption of photons from the sun is coupled to production of ATP, the biological battery pack.
Plants, algae, and some bacteria are capable of carrying out photosynthesis. They could get the immediate benefit of portable ATP molecules to drive biochemical reactions. However, the production of ATP in photosynthesis is also connected to carbon capture. Carbon dioxide from the air is incorporated into carbohydrate molecules. This conversion happens in a series of reactions called "dark reactions", because they keep happening even without sunlight. The carbohydrates can be stored, long-term, and later they can be used as energy sources via glycolysis and the citric acid cycle.
Figure \(\PageIndex{2}\): In photosynthesis, the ATP is diverted to carbohydrate production for long-term energy storage.
Animals, of course, benefit from this process indirectly because they can also use carbohydrates as a source of energy. The breakdown of carbohydrates releases energy through the usual trade-off: slightly weaker C-H and C-C bonds are broken and slightly stronger O-H and C-O bonds are made, meaning there is an overall release of energy. By eating plants, we can immediately access these carbohydrates without all the fuss of standing in the sun all day making them ourselves.
If you remember some basic plant biology, you may be familar with another aspect of photosynthesis. The "balanced reaction" for photosynthesis also involves the conversion of water to molecular oxygen, as follows:
\(\ce{6CO_{2 \: (g)} + 6H2O_{(l)} -> C6H12O6_{(s)} + 6O2_{(g)}}\)
Oxygen is a key player in oxidative phosphorylation, in which glycolysis and the TCA cycle are made even more efficient by boosting the amount of ATP produced for every glucose molecule broken down. Most organisms (including us) just can't survive without that extra ATP; we depend on plants for our survival in more ways than one.
But in contrast to what is suggested by the balanced reaction, the production of oxygen by plants is actually carried out separately from carbohydrate synthesis. Production of oxygen is actually part of the "light reaction", along with ATP synthesis.
Figure \(\PageIndex{3}\): Photosynthesis is also associated with the production of molecular oxygen.
In photosynthesis, water is oxidised to produce molecular oxygen. Plants take the electrons that they have stripped from the water molecules and divert them into an electron transport chain. Energy harnessed by that electron transport chain is used to convert ADP to ATP. In oxidative phosphorylation, organisms (including plants) take electrons from NADH and succinate and divert them into an electron transport chain, eventually depositing them onto an oxygen molecule to make water. Energy harnessed by that electron transport chain is used to convert ADP to ATP.
That means we have two opposite processes that both are harnessed to produce ATP. In one process, the electrons run downhill energetically and are deposited on dioxygen to make water. That's oxidative phosphorylation. Photosynthesis is really oxidative phosphorylation running in reverse: the electrons start on water and proceed through an electron chain from there. But if oxidative phosphorylation runs downhill, then photosynthesis must run uphill.
That's where the light comes in. The light absorbed in photosynthesis is used to lift the electrons uphill in energy; from there, they can start rolling downhill through the electron transport chain, releasing energy along the way that can be harnessed for ATP formation.
All of these events take place in a special organelle in the plant called the chloroplast. Chloroplasts are a little bit like mitochondria, where the important metabolic processes such the TCA cycle and oxidative phosphorylation take place. Like mitochondria, chloroplasts contain their own DNA and ribosomes for protein production and they are passed on directly from mother cell to daughter cell. Chloroplasts have a double membrane and are filled with an aqueous medium called the stroma.
Figure \(\PageIndex{4}\): Simplified diagram of a chloroplast.
Within the chloroplast there are structures called thylakoids. A thylakoid is like a complex water balloon; it has a membrane and is filled with an aqueous medium called the lumen. Unlike a simple water balloon, though, the thylakoid has portions that are deeply folded, so that they look like discs stacked in layers. These portions of the thylakoid are called the grana. The regular, non-folded portions are called the lamellae.
Figure \(\PageIndex{5}\): Simplified diagram of thylakoid structure.
The thylakoid plays a very important role in phtosynthesis. A group of protein complexes bound to the thylakoid membrane carry out the absorption of light energy, the conversion of water to dioxygen, and the production of ATP, as well as an electron carrier, NADPH. The ATP and NADPH are released into the surrounding stroma. A soluble protein in the stroma, called ribulose bisphosphate carboxylase (RuBisCo) captures carbon dioxide and covalently attaches it to a carbohydrate molecule. Other proteins then use the ATP and NADPH to reduce the carboxylate group (from the CO2) into a regular part of the carbohydrate chain. In this way, rather than trying to knit six carbon dioxide molecules together into a glucose, the problem is simplified into just taking up one carbon dioxide at a time, adding it into a pre-existing sugar.
The ATP is produced by an ATP synthase, which is very similar to the complex used for the same purpose during oxidative phosphorylation. Just like the ATP synthase in the mitochondria, this one is driven by a proton gradient. The proton gradient is created through an electron transport pathway, just like the one in the mitochondria. In fact, many of the features of photosynthesis are pretty similar to oxidative phosphorylation. A crucial difference is that the electron transport chain in oxidative phosphorylation starts with NADH and ends with water, whereas in photosynthesis it is the reverse: the chain starts with water and ends with NADPH. The electron transport chain in oxidative phosphorylation is exothermic, running downhill in energy. The electron transport chain in photosynthesis would be endothermic, but can be sustained by the input of energy in the form of light.
PSoverview 2.png
Figure \(\PageIndex{6}\): Simplified diagram of the major participants in photosynthesis.
See the section on photosynthesis at Henry Jakubowski's Biochemistry Online. | https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_Structure_and_Reactivity_in_Organic_Biological_and_Inorganic_Chemistry_(Schaller)/V%3A__Reactivity_in_Organic_Biological_and_Inorganic_Chemistry_3/09%3A_Photosynthesis/9.02%3A_Introduction_to_Photosynthesis | isPartOf: CC-MAIN-2021-17
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Photosynthesis and Cellular Respiration
• Submitted By: hooks
• Date Submitted: 03/17/2009 8:28 AM
• Category: Science
• Words: 451
• Page: 2
• Views: 1216
Here are 2 conditions for life:
1.) All matter must be continually recycled
2.) We need and energy source
Plants are example of Autotrophs they use energy from the sun to convert CO2 and water into carbohydrates, (specifically Glucose). This process is called Photosynthesis and occurs in the chloroplasts.
6CO2 + 12H2O + Sunlight => C6H12O6 + 6O2 + 6H2O
Carbon Dioxide + Water + Sunlight => Glucose + Oxygen + Water
People and animals are an example of Heterotrophs they are not capable of making their own food, so they must take in food already made.
For example, we eat vegetables, or we eat animals that have eaten plats to get carbohydrates. This original plant eats requited the sun to grow.
Heterotrophs break the chemical bonds and return CO2 and water back to the environment. This takes place in the Mitochondria and is called Cellular Respiration.
C6H12O6 + 6O2 => 6CO2 + 6H2O + Energy
Glucose + Water => Carbon Dioxide + Water + Energy
At certain steps of the process, inorganic phosphate (P2) combine with adenosine diphosphate (ADP) to form adenosine triphosphate (ATP). This process is called Phosphorylation. CO2 is released as a waste product.
Why do we need ATP?
It is important for cellular functions such as active transport and cell division.
Endergonic Reaction Process that requires (consumes energy)
Exergonic Reaction Process that gives off (releases energy)
ADP + P1 = ATP
When energy is released in an exergonic reaction (to form ADP), it must be released in a controlled manner to minimize pH and temperature changes, otherwise, combining oxygen with hydrogen can cause a heat explosion.
The phosphorylation of ATP allows for the slow oxidation of food and release of energy in small packets that can be capture by ATP.
This gradual release is accomplished by the Electron Transport System which takes energy rich ions removed during the breakdown of glucose and then passes these electrons...
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30 Cards in this Set
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organisms, such as plants, that make their own food
Autotrophs or producers
uses the sun’s energy to convert water and carbon dioxide into sugars
organisms and animals that obtain energy from the foods they consume
Heterotrophs or consumers
chemical process that uses oxygen to convert the chemical energy stored in organic molecules (glucose) into ATP (energy currency
Cellular respiration
potential energy in food or organic molecules
Chemical energy
the amount of energy required to raise the temperature of 1g of water by 1°Celsius
one of the principal chemical compounds that living things use to store energy
ATP (adenosine triphosphate)
electron carriers pass electrons on to other carriers in a series of transfers
Electron transport chain
name that refers to all of a cells chemical processes
protein structures in mitochondria that act like miniature turbines and convert ADP into ATP
ATP synthases
used by cells to release energy in the absence of oxygen
What are the three parts of an ATP molecule?
adenine, ribose, and a triphosphate tail
Describe the ATP cycle
ATP is continuously converted to ADP as your cells do work. ADP is recycled back into ATP by adding a third phosphate group
What is the chemical equation for cellular respiration in words?
oxygen + glucose yields carbon dioxide + water
What are the three steps to cellular respiration?
glycolysis, Krebs cycle, and electron transport / ATP synthase
energy of motion
Kinetic energy
energy that is stored due to an object's position or arangement
Potential energy
type of kinetic energy in which there is random molecular motion
Thermal energy
During cellular respiration, what three molecules are produced?
ATP, carbon dioxide, and water
Explain the role of food (glucose) in both photosynthesis and cellular respiration.
Glucose is a product of photosynthesis and a reactant in cellular respiration
What is released when ATP is involved in a chemical reaction that breaks a phosphate bond?
energy (potential)
ATP provides the energy for what three main types of cellular work?
chemical work, mechanical work, and transport work
What is the source of energy for regenerating ATP from ADP?
Chemical energy from organic molecules in food.
Why does the process of cellular respiration release energy?
An atom’s positively charged nucleus exerts an electrical “pull” on the negatively charged electrons.
When an electron “falls” toward the nucleus, potential energy is released.
How does an electron transport chain result in the gradual release of energy stored in glucose?
As high-energy electrons from glucose are transferred from one electron carrier to another, a small amount of energy is released at each step.
With oxygen
Without oxygen
Where does glycolysis occur and how much energy is produced in the process?
Glycolysis occurs in the cytoplasm of the cell. A net gain of two ATP molecules are produced during glycolysis.
During exercise, what causes muscle soreness and fatigue?
The build up of lactic acid, which is the product of fermentation in the cells.
Describe at least one example of how fermentation in microorganisms produces human foods.
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114 Cards in this Set
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What do some organisms convert to make chemical energy in food
What part of foods is used for chemical energy
Sugars and other organic molecules
A plant that makes its own food
What does autotroph mean in Greek
What do plants use the sun's energy to convert into sugars
Water and carbon dioxide
What is the process called when plants use the sun's energy to convert water and carbon dioxide into sugars
What does photosynthesis mean in Greek
Photo = light
Synthesis = making something
Are autotrophs "producers" or "consumers"
Because they produce the organic molecules for food
What are the major "producers" on land and in water
Land = plants
In water = algae and photosynthetic bacteria
Organisms that cannot make their own food are called
Heterotrophs = other eaters
Are humans autotrophs or heterotrops
Are heterotrophs producers or consumers
What do most producers depend on to make energy
Chemical process that uses oxygen to convert the chemical energy stored in organic molecules to ATP
Cellular respiration
What does ATP stand for
Adenosine TriPhosphate
What do cells in plants and animals use for their main energy supply
Photosynthesis and cellular respiration use what set of chemicals
Carbon dioxide
What chemicals are used for photosynthesis
Carbon dioxide
What do plants use for energy to change water and carbon dioxide
Photosynthesis uses sunlight to change water and carbon dioxide into what
Glucose and oxygen
Oxygen is used during cellular respiration to release what
Oxygen releases the energy stored in Glucose
When energy is released during cellular respiration, what do the cells produce
Chemical energy stored in ATP
What kind of energy is used for photosynthesis
Light energy from the sun
What are the products of photosynthesis
Glucose and oxygen
What are the products of cellular respiration
Carbon dioxide and water
What is the ability to perform work
Two basic forms of energy
Kinetic and potential
Energy of motion
Kinetic energy
Kinetic is Greek for "motion"
Energy that is stored due to an object's position or arrangement
Potential energy
Does climbing higher increase or decrease your potential energy
Because you have more force of gravity the higher up you are
What kind of energy is random molecular motion
Thermal energy
Thermal energy that is transferred from a warmer object to a cooler one
What kind of energy comes from organic compounds in food
Chemical energy
What kinds of organic molecules are high in chemical energy
During cellular respiration, what percent of food do cells convert into useful energy
What does the body do with the 60% of energy from food that it doesn't use
60% is converted to thermal energy and lost by body heat, sweating
When you just sit in class, you radiate how much heat
Like a 100 watt lightbulb
The amount of energy required to raise the temperature of 1 gm of water by 1 degree Celsius
A calorie
How is the energy content in food usually expressed
1 kilocalorie (kcal)=1000 cal
Which activity uses the most energy?
Biking, walking, running
In ATP, what is the adenosine made of
Adenosine =
Adenine + Ribose
In ATP, what is the triphosphate made of
3 phosphate groups in a tail
* Source of energy for most cellular work
An ATP molecule contains "potential energy". How is energy released?
When a phosphate group is pulled away.
ATP changes when a phosphate group is lost during a chemical reaction - what is the molecule then called
Adenosine DiPhosphate
The cells perform what 3 main kinds of work
What is an example of cellular chemical work
Building large molecules like proteins
What is an example of cellular mechanical work
Moving a muscle by changing protein shapes
What is an example of cellular transport work
Pumping solutes across a membrane
As cells do work, ATP is continuously converted to what
How is ADP restored to be ATP
Add the third phosphate group
ADP + Phosphate =
How many ATP molecules are used and recreated per second
10 million
ATP cycle uses energy from food to make what
Energy for working cells
The cells are like automobile engines. What process do the cells use for energy that is like a car's internal combusion process
Cellular respiration
Is cellular respiration anaerobic or aerobic
Aerobic = requires oxygen
During cellular respiration, what 2 gases are released
Oxygen and carbon dioxide
How is cellular respiration like breathing
Cell Resp: Cell takes in oxygen and releases carbon dioxide
Breathing: Lungs take in oxygen from the air into blood and blows off Carbon dioxide
How does breathing support cellular respiration
Breathing provides the body with oxygen and removes carbon dioxide
What is a common fuel for cellular respiration
In cellular respiration, atoms in glucose and oxygen are rearranged to form
Carbon dioxide and water
The main function of cellular respiration
Make ATP for cellular work
One glucose molecule can produce how many ATP molecules
About 38
Cellular respiration tranfers hydrogen and carbon from glucose to oxygen to form what
Carbon dioxide and water
Heterotrophs are called:
What are the waste products of cellular respiration
Carbon dioxide and water
What is the "net gain" of ATP molecules produced directly by glycolysis
Glycolysis produces 4 ATP, but 2 are used for the process, leaving only 2
Which molecule accepts electrons from the final carrier in the electron transport chain
What are the 3 main stages of cellular respiration
Glycolyis (breakdown glucose)
Krebs cycle
Electron transport and ATP synthesis
How many ATP molecules are used to break down glucose
What molecules are the products of glycolysis
2 pyruvic acid
Which molecule is the "carrier" in glycolysis
Takes on hydrogen to become NADH
What process finishes the breakdown of pyruvic acid to carbon dioxide and releases more energy
Krebs cycle
Where are the enzymes used for the Krebs cycle
Dissolved in the fluid matrix in a mitochondrion inner membrane
How many times does the Krebs cycle turn for each glucose molecule
Has to turn twice because glycolysis splits glucose into 2 pyruvic acids
Where does glycolysis take place
Outside the mitochondria in the cytoplasm
Pyruvic acid is not part of Kreb cycle. It loses a carbon dioxide molecule and becomes
acetyl CoA
What is the total carbon dioxide and ATP molecules produced by the Kreb cycle
4 carbon dioxide
The final stage of cellular respiration takes place in the inner membrane of the mitochondria. What are the 2 parts of this stage
Electron transport chain and
ATP production by ATP synthase
NADH carrier molecule transfers electrons from sugar to the end of the chain where they are "grabbed" by what molecule
Electron transport chain releases energy to do what
Pump hydrogen ions across the inner membrane
Oxygen combines with electrons and hydrogen ions to form
What part of the mitochondria have protein structures that act like miniature turbine engines
ATP synthases
The ATP synthase generates what
ATP from ADP
The 3 stages of cellular respiration can produce a maximum of how many ATP per glucose molecule
Glycolysis = 2 ATP
Krebs cycle = 2 ATP
ATP synthase = 34
Total = 38
What is the function of cellular respiration
Generate ATP for cellular work
Most ATP production occurs after glycolysis and so the body must always have a fresh supply of what
If your body is using ATP faster than you have oxygen, can the cells produce ATP without oxygen
Yes, for a short time
What is the process by which cells make ATP without oxygen
How does the body use the chemical energey stored from food
ATP cycle converts the energy
Why does the ATP "tail" have more potential stored energy
The phosphate groups are negatively charged and each negative group repels the other - causing energy
Cells perform what 3 kinds of work
Chemical work
Mechanical work
Transport work
What is an example of cellular chemcical work
Building a large molecule
What is an example of cellular mechanical work
Moving a muscle protein so the muscle can contract
What is an example of cellular transport work
Pumping solutes across a membrane
Is APT recyclable?
Yes. ATP can be restored from ADP by adding a 3rd phosphate group
How fast does the cell recycle all of its APT
Every minute or
10 million ATP molecules per second
How is cellular respiration related to breathing
Both processes exchange 2 gasses.
Cell or lungs take in oxygen and release carbon dioxide in each process
A process that require oxygen is called
Cellular respiration is aerobic
What is the common fuel for cellular respiration
What is the main function of cellular respiration
Generate ATP for cellular work
What part of the cell is the key to cellular respiration
What between the two layers or envelope around the mitochondria
There is a space between the layers filled with thick fluid called the matrix
Are most enzymes needed for cellular respiration in the inner or outer membrane of the mitochondria
Most enzymes are in the folded inner layer so there are many sites for ATP reactions to occur
A cell's chemical processes
What are the 3 main stages of cellular respiration
Krebs cycle
Electron transport and ATP synthase
Process of breaking down a glucose molecule is called
"splitting of sugar"
How many ATP molecules are needed to start glycolysis
What are the products of gylcolysis
2 pyruvic acid molecules
2 NADH molecules
4 ATP molecules
Fermentation in yeast produces
Ethyl alcohol
Fermentation in muscle cells produces what waste product
Lactic acid
What microscopic fungus is capable of both cellular respiration and fermentation
Fermentation produces ethyl alcohol and releases what
Carbon dioxide
How is the carbon dioxide released during fermentation used?
To make champagne and beer bubbles
To make air bubbles so bread rises
What foods are made by the lactic acid produced by fungi and bacteria during fermentation
Change milk into cheese and yogurt
Soybeans - soy sauce
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} | 291 | What molecule temporarily stores energy in cells?
What molecule temporarily stores energy in cells?
adenosine triphosphate
What molecule do cells use to store energy?
What are the temporary energy storage molecules in cellular respiration?
When glucose is broken down during cellular respiration energy is stored temporarily in molecules of ATP. ATP can be used to power chemical reactions, such as those that build molecules.
What is the energy carrying molecule used to capture and store energy called?
Adenosine triphosphate (ATP)
What is the main purpose of glucose catabolism?
Carbohydrate catabolism. Digestion is the breakdown of carbohydrates to yield an energy rich compound called ATP. The production of ATP is achieved through the oxidation of glucose molecules. In oxidation, the electrons are stripped from a glucose molecule to reduce NAD+ and FAD.
What is the correct order of phases in the release of energy from glucose?
Cellular respiration is the process in which cells break down glucose, release the stored energy, and use it to make ATP. The process begins in the cytoplasm and is completed in a mitochondrion. Cellular respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport
What is the correct order of the steps in aerobic respiration?
Aerobic respiration involves four stages:
• glycolysis,
• a transition reaction that forms acetyl coenzyme A,
• the citric acid (Krebs) cycle, and an electron transport chain and.
• chemiosmosis.
Which type of process requires oxygen?
What process does not require sunlight?
Cellular respiration, on the other hand, is the process by which living things convert oxygen and glucose to carbon dioxide and water, thereby yielding energy. It does not require the presence of sunlight and is always occurring in living organisms. Cellular respiration takes place in the mitochondria of cells. | https://rehabilitationrobotics.net/what-molecule-temporarily-stores-energy-in-cells/ | isPartOf: CC-MAIN-2021-39
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} | 620 | • Created by: bubblyobo
• Created on: 10-01-13 12:47
All living cells require energy, and this energy isprovided by the oxidation of glucose – respiration.
glucose + oxygen → carbon dioxide + water
• The oxidation of glucose is strongly exothermic, but in respiration the energy is released not as heat, but in the form of chemical energy in a compound called ATP(adenosine triphosphate).
• ATP is built up from ADP and phosphate (PO3-4, abbreviated to Pi).
• So all respiration really does is convert chemical energy stored in glucose into chemical energy stored in ATP.
• ATP is a nucleotide (one of the four found in DNA),but it also has this other function as an energy storage molecule.
• So ATP is actually a bigger molecule than glucose, but it is very soluble and the energy it contains can be released very quickly and easily.
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Respiration 2
• ATP stores a much smaller amount of energy than glucose.
• This is a good thing, as these small packets of easily-released energy are more useful to cells and can be used to do simple common jobs.
2 of 5
What is the energy in ATP used for?
The processes in a cell that require energy can be put into three groups:
• Muscle contraction and other forms of movement, such as cilia, flagella, cytoplasmic streaming, etc. Each step of the muscle crossbridge cycle costs one ATP molecule.
• Active transport. Each shape change in an active transport protein pump costs one ATP molecule.
• Biosynthesis– building up large molecules from smaller ones, e.g. protein synthesis, DNA replication, starch synthesis, etc. Each monomer added to a growing polymer chain costs one ATP molecule.
Since these processes use ATP, they all involve ATPase enzymes. ATPases catalyse the hydrolysis of ATP to ADP + Pi, and do work with the energy released.
All the thousands of chemical reactions taking place in a cell are referred to as Metabolism.
To make the reactions easier to understand, biochemists arrange them into metabolic pathways.The intermediates in these metabolic pathways are called metabolites.
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• Much of respiration takes place in the mitochondria.
• Mitochondria have a double membrane: the outer membrane contains many protein channels called porins, which let almost any small molecule through; while the inner membrane is more normal and is selectively permeable to solutes.
• The inner membrane is highly folded into projections called cristae, giving a larger surface area.
• The electron microscope reveals blobs on the inner membrane, called stalked particles.
• These blobs have now been identified as enzyme complexes that synthesise ATP, and are more correctly called ATP synthase enzymes (more later).
• The space inside the inner membrane is called the matrix, and is where the Krebs cycle takes place.
• The matrix also contains DNA, tRNA and ribosomes, and some genes are replicated and expressed here.
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Details of Respiration
The equation for cellular respiration is usually simplified to:
glucose + oxygen →carbon dioxide + water (+ energy)
• The different stages of respiration take place in different parts of the cell. This compartmentation allows the cell to keep the various metabolites separate, and to control the stages more easily.
• The energy released by respiration is in the form of ATP.
• Since this summarises so many separate steps (often involving H+ and OH-ions from the solvent water), it is meaningless to try to balance the summary equation.
• The release of carbon dioxide takes place before oxygen is involved. It is therefore not true to say that respiration turns oxygen into carbon dioxide; it is more correct to say that respiration turns glucose into carbon dioxide, and oxygen into water.
• Stage 1 (glycolysis) is anaerobic respiration, while stages 2 and 3 are the aerobic stages.
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} | 1,545 | << Chapter < Page Chapter >> Page >
• Explain how ATP is used by the cell as an energy source
• Describe the overall result in terms of molecules produced of the breakdown of glucose by glycolysis
Even exergonic, energy-releasing reactions require a small amount of activation energy to proceed. However, consider endergonic reactions, which require much more energy input because their products have more free energy than their reactants. Within the cell, where does energy to power such reactions come from? The answer lies with an energy-supplying molecule called adenosine triphosphate, or ATP . ATP is a small, relatively simple molecule, but within its bonds contains the potential for a quick burst of energy that can be harnessed to perform cellular work. This molecule can be thought of as the primary energy currency of cells in the same way that money is the currency that people exchange for things they need. ATP is used to power the majority of energy-requiring cellular reactions.
Atp in living systems
A living cell cannot store significant amounts of free energy. Excess free energy would result in an increase of heat in the cell, which would denature enzymes and other proteins, and thus destroy the cell. Rather, a cell must be able to store energy safely and release it for use only as needed. Living cells accomplish this using ATP, which can be used to fill any energy need of the cell. How? It functions as a rechargeable battery.
When ATP is broken down, usually by the removal of its terminal phosphate group, energy is released. This energy is used to do work by the cell, usually by the binding of the released phosphate to another molecule, thus activating it. For example, in the mechanical work of muscle contraction, ATP supplies energy to move the contractile muscle proteins.
Atp structure and function
At the heart of ATP is a molecule of adenosine monophosphate (AMP), which is composed of an adenine molecule bonded to both a ribose molecule and a single phosphate group ( [link] ). Ribose is a five-carbon sugar found in RNA and AMP is one of the nucleotides in RNA. The addition of a second phosphate group to this core molecule results in adenosine di phosphate (ADP); the addition of a third phosphate group forms adenosine tri phosphate (ATP).
This illustration shows the molecular structure of ATP. This molecule is an adenine nucleotide with ribose and a string of three phosphate groups attached to it. The phosphate groups are named alpha, beta, and gamma in order of increasing distance from the ribose sugar to which they are attached.
The addition of a phosphate group to a molecule requires a high amount of energy and results in a high-energy bond. Phosphate groups are negatively charged and thus repel one another when they are arranged in series, as they are in ADP and ATP. This repulsion makes the ADP and ATP molecules inherently unstable. The release of one or two phosphate groups from ATP, a process called hydrolysis, releases energy. Hydrolysis occurs when water is added to break the chemical bond and is the opposite of dehydration synthesis reactions discussed previously.
Glycolysis begins with the six-carbon, ring-shaped structure of a single glucose molecule and ends with two molecules of a three-carbon sugar called pyruvate. Glycolysis consists of two distinct phases. In the first part of the glycolysis pathway, energy is used to make adjustments so that the six-carbon sugar molecule can be split evenly into two three-carbon pyruvate molecules. In the second part of glycolysis, ATP and nicotinamide-adenine dinucleotide (NADH) are produced ( [link] ). NAD+ is the form of the coenzyme that is able to accept electrons and hydrogen from the glucose. NADH carries the electrons to a later stage in metabolism to be used to provide energy (indirectly) to catalyze the endergonic reaction of adding a phosphate group to ADP to make ATP.
If the cell cannot catabolize the pyruvate molecules further, it will harvest only two ATP molecules from one molecule of glucose. For example, mature mammalian red blood cells are only capable of glycolysis, which is their sole source of ATP. If glycolysis is interrupted, these cells would eventually die.
A graphic shows glucose at the top with an arrow pointing down to fructose diphosphate, which then splits into two glyceraldehyde 3-phosphate molecules. Each of these forms one NADH and two ATP molecules in the process of each becoming a pyruvate molecule.
In glycolysis, a glucose molecule is converted into two pyruvate molecules. Notice that each of the two molecules has three carbon atoms, representing the six carbons that were present in the glucose that started the process. This means that no carbon dioxide is released in glycolysis, as the carbon to make it comes from the glucose molecule.
Section summary
ATP functions as the energy currency for cells. It allows cells to store energy briefly and transport it within itself to support endergonic chemical reactions. The structure of ATP is that of an RNA nucleotide with three phosphate groups attached. As ATP is used for energy, a phosphate group is detached, and ADP is produced. Energy derived from glucose catabolism is used to recharge ADP into ATP.
Glycolysis is the first pathway used in the breakdown of glucose to extract energy. Because it is used by nearly all organisms on earth, it must have evolved early in the history of life. Glycolysis consists of two parts: The first part prepares the six-carbon ring of glucose for separation into two three-carbon sugars. Energy from ATP is invested into the molecule during this step to energize the separation. The second half of glycolysis extracts ATP and high-energy electrons from hydrogen atoms and attaches them to NAD + . Two ATP molecules are invested in the first half and four ATP molecules are formed during the second half. This produces a net gain of two ATP molecules per molecule of glucose for the cell.
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biology is the study of life.
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} | 1,531 | ATP in Living Systems
What you’ll learn to do: Describe how cells store and transfer free energy using ATP
All living things require energy to function. While different organisms acquire this energy in different ways, they store (and use it) in the same way. In this section, we’ll learn about ATP—the energy of life. ATP is how cells store energy. These storage molecules are produced in the mitochondria, tiny organelles found in eukaryotic cells sometimes called the “powerhouse” of the cell.
Mitochondrial Disease Physician
What happens when the critical reactions of cellular respiration do not proceed correctly? Mitochondrial diseases are genetic disorders of metabolism. Mitochondrial disorders can arise from mutations in nuclear or mitochondrial DNA, and they result in the production of less energy than is normal in body cells.
In type 2 diabetes, for instance, the oxidation efficiency of NADH is reduced, impacting oxidative phosphorylation but not the other steps of respiration. Symptoms of mitochondrial diseases can include muscle weakness, lack of coordination, stroke-like episodes, and loss of vision and hearing. Most affected people are diagnosed in childhood, although there are some adult-onset diseases.
Identifying and treating mitochondrial disorders is a specialized medical field. The educational preparation for this profession requires a college education, followed by medical school with a specialization in medical genetics. Medical geneticists can be board certified by the American Board of Medical Genetics and go on to become associated with professional organizations devoted to the study of mitochondrial diseases, such as the Mitochondrial Medicine Society and the Society for Inherited Metabolic Disease.
Learning Outcomes
Describe how cells store and transfer free energy using ATP
A living cell cannot store significant amounts of free energy. Excess free energy would result in an increase of heat in the cell, which would result in excessive thermal motion that could damage and then destroy the cell. Rather, a cell must be able to handle that energy in a way that enables the cell to store energy safely and release it for use only as needed. Living cells accomplish this by using the compound adenosine triphosphate (ATP). ATP is often called the “energy currency” of the cell, and, like currency, this versatile compound can be used to fill any energy need of the cell. How? It functions similarly to a rechargeable battery.
When ATP is broken down, usually by the removal of its terminal phosphate group, energy is released. The energy is used to do work by the cell, usually by the released phosphate binding to another molecule, activating it. For example, in the mechanical work of muscle contraction, ATP supplies the energy to move the contractile muscle proteins. Recall the active transport work of the sodium-potassium pump in cell membranes. ATP alters the structure of the integral protein that functions as the pump, changing its affinity for sodium and potassium. In this way, the cell performs work, pumping ions against their electrochemical gradients.
ATP Structure and Function
This illustration shows the molecular structure of ATP. This molecule is an adenine nucleotide with a string of three phosphate groups attached to it. The phosphate groups are named alpha, beta, and gamma in order of increasing distance from the ribose sugar to which they are attached.
Figure 1. ATP (adenosine triphosphate) has three phosphate groups that can be removed by hydrolysis to form ADP (adenosine diphosphate) or AMP (adenosine monophosphate).The negative charges on the phosphate group naturally repel each other, requiring energy to bond them together and releasing energy when these bonds are broken.
At the heart of ATP is a molecule of adenosine monophosphate (AMP), which is composed of an adenine molecule bonded to a ribose molecule and to a single phosphate group (Figure 1). Ribose is a five-carbon sugar found in RNA, and AMP is one of the nucleotides in RNA. The addition of a second phosphate group to this core molecule results in the formation of adenosine diphosphate (ADP); the addition of a third phosphate group forms adenosine triphosphate (ATP).
The addition of a phosphate group to a molecule requires energy. Phosphate groups are negatively charged and thus repel one another when they are arranged in series, as they are in ADP and ATP. This repulsion makes the ADP and ATP molecules inherently unstable. The release of one or two phosphate groups from ATP, a process called dephosphorylation, releases energy.
Energy from ATP
Hydrolysis is the process of breaking complex macromolecules apart. During hydrolysis, water is split, or lysed, and the resulting hydrogen atom (H+) and a hydroxyl group (OH) are added to the larger molecule. The hydrolysis of ATP produces ADP, together with an inorganic phosphate ion (Pi), and the release of free energy. To carry out life processes, ATP is continuously broken down into ADP, and like a rechargeable battery, ADP is continuously regenerated into ATP by the reattachment of a third phosphate group. Water, which was broken down into its hydrogen atom and hydroxyl group during ATP hydrolysis, is regenerated when a third phosphate is added to the ADP molecule, reforming ATP.
Obviously, energy must be infused into the system to regenerate ATP. Where does this energy come from? In nearly every living thing on earth, the energy comes from the metabolism of glucose. In this way, ATP is a direct link between the limited set of exergonic pathways of glucose catabolism and the multitude of endergonic pathways that power living cells.
Recall that, in some chemical reactions, enzymes may bind to several substrates that react with each other on the enzyme, forming an intermediate complex. An intermediate complex is a temporary structure, and it allows one of the substrates (such as ATP) and reactants to more readily react with each other; in reactions involving ATP, ATP is one of the substrates and ADP is a product. During an endergonic chemical reaction, ATP forms an intermediate complex with the substrate and enzyme in the reaction. This intermediate complex allows the ATP to transfer its third phosphate group, with its energy, to the substrate, a process called phosphorylation. Phosphorylation refers to the addition of the phosphate (~P). This is illustrated by the following generic reaction:
A + enzyme + ATP → [A − enzyme − ~P] → B + enzyme + ADP + phosphate ion
When the intermediate complex breaks apart, the energy is used to modify the substrate and convert it into a product of the reaction. The ADP molecule and a free phosphate ion are released into the medium and are available for recycling through cell metabolism.
This illustration shows a substrate-level phosphorylation reaction in which the gamma phosphate of ATP is attached to a protein.
Figure 2. In phosphorylation reactions, the gamma phosphate of ATP is attached to a protein.
Substrate Phosphorylation
ATP is generated through two mechanisms during the breakdown of glucose. A few ATP molecules are generated (that is, regenerated from ADP) as a direct result of the chemical reactions that occur in the catabolic pathways. A phosphate group is removed from an intermediate reactant in the pathway, and the free energy of the reaction is used to add the third phosphate to an available ADP molecule, producing ATP (Figure 2). This very direct method of phosphorylation is called substrate-level phosphorylation.
Oxidative Phosphorylation
Most of the ATP generated during glucose catabolism, however, is derived from a much more complex process, chemiosmosis, which takes place in mitochondria (Figure 3) within a eukaryotic cell or the plasma membrane of a prokaryotic cell.
This illustration shows the structure of a mitochondrion, which has an outer membrane and an inner membrane. The inner membrane has many folds, called cristae. The space between the outer membrane and the inner membrane is called the intermembrane space, and the central space of the mitochondrion is called the matrix. ATP synthase enzymes and the electron transport chain are located in the inner membrane
Figure 3. The mitochondria (Credit: modification of work by Mariana Ruiz Villareal)
Chemiosmosis, a process of ATP production in cellular metabolism, is used to generate 90 percent of the ATP made during glucose catabolism and is also the method used in the light reactions of photosynthesis to harness the energy of sunlight. The production of ATP using the process of chemiosmosis is called oxidative phosphorylation because of the involvement of oxygen in the process.
In Summary: ATP in Living Systems
ATP functions as the energy currency for cells. It allows the cell to store energy briefly and transport it within the cell to support endergonic chemical reactions. The structure of ATP is that of an RNA nucleotide with three phosphates attached. As ATP is used for energy, a phosphate group or two are detached, and either ADP or AMP is produced. Energy derived from glucose catabolism is used to convert ADP into ATP. When ATP is used in a reaction, the third phosphate is temporarily attached to a substrate in a process called phosphorylation. The two processes of ATP regeneration that are used in conjunction with glucose catabolism are substrate-level phosphorylation and oxidative phosphorylation through the process of chemiosmosis.
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ATP and Cellular Work
A cell must perform several kinds of work: mechanical work involved in movement of the cell or parts of the cell, transport work in pumping molecules across membranes, and chemical work in driving endergonic reactions to synthesize cellular molecules. The immediate source of the energy to perform this work most often comes from adenosine triphosphate, or ATP.
Structure and Hydrolysis of ATP
ATP is a nucleoside triphosphate, the purine base adenine bonded to the sugar ribose, which is connected to a chain of three phosphate groups.
The triphosphate tail of ATP is unstable and the bonds between the phosphate groups can be broken by hydrolysis. Thus, ATP can be hydrolyzed to ADP (adenosine diphosphate) and an inorganic phosphate molecule, releasing 7.3 kilocalories of energy per mole of ATP.
Although the phosphate bonds in ATP are called high-energy bonds, they are actually weak bonds, easily hydrolyzed to yield more products and release energy.
How ATP Performs Work
The transformation to a more stable state releases energy. In a cell, this energy can be used to transfer the phosphate group from ATP to another molecule, producing a phosphorylated intermediate that is more reactive. The phosphorylation of other molecules by ATP forms the basis for almost all cellular work.
Regeneration of ATP
A cell regenerates ATP at a phenomenal rate, approximately your body weight every day. The formation of ATP from ADP and inorganic phosphate is endergonic, with a G of +7.3 kcal/mol. Cellular respiration (the catabolic processing of glucose and other organic molecules) provides the energy for the regeneration of ATP. Plants can also produce ATP using light energy.
The cellular processes of generating ATP are discussed at the following sites:
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What is needed to remove a phosphate from ATP?
ATP Structure and Function ATP (adenosine triphosphate) has three phosphate groups that can be removed by hydrolysis to form ADP (adenosine diphosphate) or AMP (adenosine monophosphate). Phosphate groups are negatively charged and thus repel one another when they are arranged in series, as they are in ADP and ATP.
When a phosphate molecule is removed from ATP energy is?
When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP). Likewise, energy is also released when a phosphate is removed from ADP to form adenosine monophosphate (AMP).
What results from the removal of a phosphate group from ATP quizlet?
What happens when a phosphate group is removed from an ATP molecule? When a phosphate group is removed from ATP, energy is released and ADP results.
Which best describes what happens when a phosphate molecule is removed from an ATP compound?
A phosphate is removed from an ATP molecule in order to provide energy for the cell. Thus, the ATP molecule turns into an ADP molecule. We eat food which gives us energy to add another phosphate group to the ADP molecule, turning it into an ATP molecule.
Which phosphate is the one that is released from ATP?
Adenosine di-phosphate
When would the third phosphate be removed from ATP?
When would a 3rd phosphate be removed from ATP? When a cell needs to perform a job. You just studied 30 terms!
How does ATP store and release energy?
In a process called cellular respiration, chemical energy in food is converted into chemical energy that the cell can use, and stores it in molecules of ATP. When the cell needs energy to do work, ATP loses its 3rd phosphate group, releasing energy stored in the bond that the cell can use to do work.
What are some examples of cell processes that use ATP?
ATP hydrolysis provides the energy needed for many essential processes in organisms and cells. These include intracellular signaling, DNA and RNA synthesis, Purinergic signaling, synaptic signaling, active transport, and muscle contraction.
What process does not use ATP?
Cellular respiration is the process where energy gets made from glucose. If there’s no oxygen present, then anaerobic respiration occurs, and no additional ATP is produced. Cells in the human body use aerobic respiration to produce energy.
What are 3 ways we use ATP?
ATP (Adenosine Triphosphate)
• Energy Currency. The cells energy yielding reactions synthesise ATP, and ATP is used by the cell in all forms of work.
• Synthesis.
• Active Transport.
• Muscle Contraction.
What are 3 ways cells use energy?
Cells require chemical energy for three general types of tasks: to drive metabolic reactions that would not occur automatically; to transport needed substances across membranes; and to do mechanical work, such as moving muscles.
How is ATP used in cell division?
ATP is the main source of energy for most cellular processes. The removal of a second phosphate group from ATP results in further energy release and the formation of adenosine monophosphate (AMP). …
What plant process requires ATP?
There are countless processes in plants that require ATP. A few examples are the building of starch from glucose, active transport of ions across the membranes of cells, and production of sugars in the Calvin cycle of photosynthesis.
Does facilitated diffusion require ATP?
Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.
Does photosynthesis use ATP?
All organisms need energy. Life depends on the transfer of energy. ATP is an important source of energy for biological processes. In photosynthesis energy is transferred to ATP in the light-dependent stage and the ATP is utilised during synthesis in the light-independent stage.
What activities use ATP?
• Most anabolic reactions.
• active transport of molecules and ions.
• nerve impulses.
• maintenance of cell volume by osmosis.
• adding phosphate groups (phosphorylation) to many different proteins, e.g., to alter their activity in cell signaling.
What process regenerates ATP?
One of the ways that this ATP supply is regenerated is through the molecule creatine phosphate (or phosphocreatine). In the process of regeneration of ATP, creatine phosphate transfers a high-energy phosphate to ADP.
How do we use ATP?
ATP can be used to store energy for future reactions or be withdrawn to pay for reactions when energy is required by the cell. When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP).
What is the connection between food and ATP?
Glucose is called the body’s fuel. The digestible carbohydrates in an animal’s diet are converted to glucose molecules through a series of catabolic chemical reactions. Adenosine triphosphate, or ATP, is the primary energy currency in cells; ATP stores energy in phosphate ester bonds.
What is the relationship between energy stored in food and ATP?
Describe the relationship between energy stored in food and ATP. Food molecules store chemical energy in their bonds. Food is broken down into smaller molecules that are broken down further to transfer this energy to ATP.
Why does your body need ATP?
For your muscles—in fact, for every cell in your body—the source of energy that keeps everything going is called ATP. Adenosine triphosphate (ATP) is the biochemical way to store and use energy. ATP is required for the biochemical reactions involved in any muscle contraction.
Does caffeine increase ATP production?
What gives you energy fast?
What is a natural energy booster?
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What is the difference between ATP and ADP quizlet?
What is the difference between ATP and ADP? ATP has three phosphate molecules and therefore more energy than ADP, which only has two phosphate molecules.
How does ADP convert to ATP?
Does ATP store more energy than ADP?
Is ADP more stable than ATP?
The entropy, which is the level of disorder, of ADP is greater than that of ATP. This makes ATP a relatively unstable molecule because it will want to give away its phosphate groups, when given the chance, in order to become a more stable molecule. Resonance stabilization of ADP and of Pi is greater than that of ATP.
Where is energy stored in ATP diagram?
Adenosine Triphosphate
Energy is stored in the bonds joining the phosphate groups (yellow). The covalent bond holding the third phosphate group carries about 7,300 calories of energy. Food molecules are the $1,000 dollar bills of energy storage.
What are the 3 parts of ATP?
What is an example of ATP?
For example, both breathing and maintaining your heartbeat require ATP. In addition, ATP helps to synthesize fats, nerve impulses, as well as move certain molecules into or out of cells. Some organisms, such as bioluminescent jellyfish and fireflies, even use ATP to produce light!
What is the cycle of ATP?
The process of phosphorylating ADP to form ATP and removing a phosphate from ATP to form ADP in order to store and release energy respectively is known as the ATP cycle. The energy within an ATP molecule is stored in the phosphate bonds of the ATP. When a cell needs energy, a phosphate is removed from ATP.
What are the parts of ATP?
What subunits make up ATP?
It consists of three main subunits, a, b, and c. Six c subunits make up the rotor ring, and subunit b makes up a stalk connecting to F1 OSCP that prevents the αβ hexamer from rotating. Subunit a connects b to the c ring.
What does ATP look like?
Its Structure. The ATP molecule is composed of three components. These phosphates are the key to the activity of ATP. ATP consists of a base, in this case adenine (red), a ribose (magenta) and a phosphate chain (blue).
How ATP is formed?
ATP is also formed from the process of cellular respiration in the mitochondria of a cell. This can be through aerobic respiration, which requires oxygen, or anaerobic respiration, which does not. Aerobic respiration produces ATP (along with carbon dioxide and water) from glucose and oxygen.
What makes ATP so special?
ATP is an excellent energy storage molecule to use as “currency” due to the phosphate groups that link through phosphodiester bonds. These bonds are high energy because of the associated electronegative charges exerting a repelling force between the phosphate groups.
Does photosynthesis produce ATP?
What is meant by ATP?
Adenosine 5′-triphosphate, or ATP, is the principal molecule for storing and transferring energy in cells. It is often referred to as the energy currency of the cell and can be compared to storing money in a bank.
What is another word for ATP?
In science, ATP stands for adenosine triphosphate.
What are 3 things ATP is used for in cells?
Why do we use ATP?
ATP functions as the energy currency for cells. It allows the cell to store energy briefly and transport it within the cell to support endergonic chemical reactions. As ATP is used for energy, a phosphate group or two are detached, and either ADP or AMP is produced.
Does passive transport require ATP?
Passive transport is along the gradient and requires no energy, like gas spreading out from a corner of a room. Active transport is against the gradient and requires energy, in this case, in the form of ATP. | https://fourthandsycamore.com/difference-between-atp-and-adp/ | isPartOf: CC-MAIN-2022-49
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What materials are needed for ATP?
What materials are needed for ATP?
Since ATP is found in all living things it’s sometimes called the energy currency of cells, which goes well with this laundromat analogy. In order to make ATP, you need food (sugar) and oxygen. If you don’t have food, you can’t make ATP and you’re going to die.
Is ATP made from ADP?
Adenosine triphosphate is composed of the nitrogenous base adenine, the five-carbon sugar ribose, and three phosphate groups. ADP is combined with a phosphate to form ATP in the reaction ADP+Pi+free energy→ATP+H2O.
What are two ways to make ATP?
ATP production occurs in the mitochondria of the cell. There are two methods of producing ATP: aerobic and anaerobic. In aerobic respiration, oxygen is required. Oxygen as a high-energy molecule increases ATP production from 4 ATP molecules to about 30 ATP molecules.
What produces the most ATP?
The electron transport chain
Explanation: The electron transport chain generates the most ATP out of all three major phases of cellular respiration. Glycolysis produces a net of 2 ATP per molecule of glucose.
How ATP is created?
It is the creation of ATP from ADP using energy from sunlight, and occurs during photosynthesis. ATP is also formed from the process of cellular respiration in the mitochondria of a cell. Aerobic respiration produces ATP (along with carbon dioxide and water) from glucose and oxygen.
Is ADP to ATP Endergonic?
The reverse reaction combines ADP + Pi to regenerate ATP from ADP. Since ATP hydrolysis releases energy, ATP synthesis must require an input of free energy. The phosphorylation (or condensation of phosphate groups onto AMP) is an endergonic process.
What are the three ways to make ATP?
The three processes of ATP production include glycolysis, the tricarboxylic acid cycle, and oxidative phosphorylation. In eukaryotic cells the latter two processes occur within mitochondria.
What foods produce ATP?
27 Foods That Can Give You More Energy
• Bananas. Bananas may be one of the best foods for energy.
• Brown rice.
• Sweet potatoes.
• Coffee.
• Eggs.
• Apples.
• Water.
What produces the least amount of ATP?
One occurs in the presence of oxygen (aerobic), and one occurs in the absence of oxygen (anaerobic). Both begin with glycolysis – the splitting of glucose. Glycolysis (see “Glycolysis” concept) is an anaerobic process – it does not need oxygen to proceed. This process produces a minimal amount of ATP.
Where is the majority of ATP produced?
cellular respiration
The majority of ATP synthesis occurs in cellular respiration within the mitochondrial matrix: generating approximately thirty-two ATP molecules per molecule of glucose that is oxidized.
Where is the ATP made?
ATP is how cells store energy. These storage molecules are produced in the mitochondria, tiny organelles found in eukaryotic cells sometimes called the “powerhouse” of the cell.
Why is ADP more stable than ATP?
Resonance stabilization of ADP and of Pi is greater than that of ATP. The oxygen molecules of the ADP are sharing electrons. Those electrons are constantly being passed back and forth between the oxygens, creating an effect called resonance. This stables the ADP.
What are the four major methods of producing ATP?
Glycolysis. Glycolysis is one method of producing ATP and occurs in almost all cells.
• Oxidative Phosphorylation. Oxidative phosphorylation also produces ATP and is a major producer of ATP in organisms — 26 out of 30 molecules of ATP generated from glucose are produced through
• Beta Oxidation.
• Aerobic Respiration.
• What does ATP stand for and what is it made of?
ATP stands for adenosine tri phosphate it is a molecule made in every cell of your body. ATP is a molecule that has three phosphates attached to it, in the bonds of these phosphates is a large amount of chemical energy.
What process produces the most ATP?
Most of the ATP in cells is produced by the enzyme ATP synthase , which converts ADP and phosphate to ATP.
What does ATP stand for and what does it do?
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By Drew Lichtenstein
Adenosine triphosphate (ATP) is an essential aspect to life, as it is the basic source of energy for all known living cells. ATP serves a dual function: it is individually a source of energy, as well as being involved in processes that release more energy when it is broken down to form adenosine diphosphate (ADP).
Physical Characteristics
ATP is a nucleotide, which means it is part of the basic structure that makes up DNA and RNA. One individual unit of ATP is made up of one adenosine molecule with three phosphate connected to it. ATP is unstable in water, and forms ADP when in water; this formation releases energy and is an additional source of energy in cells (the process of converting ATP to ADP to release energy in cells is known as hydrolysis).
In addition to providing energy through hydrolysis, ATP molecules serve several practical purposes in the cell. ATP transfers energy within the cell, moving it from chemical bonds to actual energy reactions. ATP, thus, serves a dual role of providing energy when it is broken down, but also of transferring energy within the cell. Additionally, because it is a nucleotide, ATP is used in the formation of new RNA and DNA when cells split and make new cells through the process of mitosis.
In plants, ATP is created during photosynthesis. Photosynthesis is the process by which plants break down sunlight into energy, with carbon dioxide and water used to instigate the chemical reaction, and oxygen as a waste byproduct. ATP is also a byproduct of this reaction; however, unlike oxygen, it is an essential byproduct because it is in ATP molecules that the energy from the sun is contained. ATP is part of the first step of photosynthesis; in the second step, this energy is released. For every two molecules of water in photosynthesis, three molecules of ATP are produced.
In animals, ATPs are not produced through photosynthesis, but are instead produced through a process called glycolysis. Glycolysis literally means "breaking sugar," and it involves the break down of a glucose molecule (C6H12O6) into pyruvates. This occurs in the mitochondria of the cell, and is the first step of the process known as cellular respiration. Glycolysis ends up producing four ATP molecules; however, the process requires two ATP molecules to begin, thus it only nets two ATP. | http://sciencing.com/characteristics-atp-8343934.html | robots: classic
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Biochemistry, Cell Biology, Molecular Biology
Adenosine Triphosphate Definition
Adenosine triphosphate, also known as ATP, is a molecule that carries energy within cells. It is the main energy currency of the cell, and it is an end product of the processes of photophosphorylation (adding a phosphate group to a molecule using energy from light), cellular respiration, and fermentation. All living things use ATP. In addition to being used as an energy source, it is also used in signal transduction pathways for cell communication and is incorporated into deoxyribonucleic acid (DNA) during DNA synthesis.
Structure of ATP
ATP Structure
This is a structural diagram of ATP. It is made up of the molecule adenosine (which itself is made up of adenine and a ribose sugar) and three phosphate groups. It is soluble in water and has a high energy content due to having two phosphoanhydride bonds connecting the three phosphate groups.
Functions of ATP
Energy Source
ATP is the main carrier of energy that is used for all cellular activities. When ATP is hydrolyzed and converted to adenosine diphosphate (ADP), energy is released. The removal of one phosphate group releases 7.3 kilocalories per mole, or 30.6 kilojoules per mole, under standard conditions. This energy powers all reactions that take place inside the cell. ADP can also be converted back into ATP so that the energy is available for other cellular reactions.
ATP is produced through several different methods. Photophosphorylation is a method specific to plants and cyanobacteria. It is the creation of ATP from ADP using energy from sunlight, and occurs during photosynthesis. ATP is also formed from the process of cellular respiration in the mitochondria of a cell. This can be through aerobic respiration, which requires oxygen, or anaerobic respiration, which does not. Aerobic respiration produces ATP (along with carbon dioxide and water) from glucose and oxygen. Anaerobic respiration uses chemicals other than oxygen, and this process is primarily used by archaea and bacteria that live in anaerobic environments. Fermentation is another way of producing ATP that does not require oxygen; it is different from anaerobic respiration because it does not use an electron transport chain. Yeast and bacteria are examples of organisms that use fermentation to generate ATP.
Signal Transduction
ATP is a signaling molecule used for cell communication. Kinases, which are enzymes that phosphorylate molecules, use ATP as a source of phosphate groups. Kinases are important for signal transduction, which is how a physical or chemical signal is transmitted from receptors on the outside of the cell to the inside of the cell. Once the signal is inside the cell, the cell can respond appropriately. Cells may be given signals to grow, metabolize, differentiate into specific types, or even die.
DNA Synthesis
The nucleobase adenine is part of adenosine, a molecule that is formed from ATP and put directly into RNA. The other nucleobases in RNA, cytosine, guanine, and uracil, are similarly formed from CTP, GTP, and UTP. Adenine is also found in DNA, and its incorporation is very similar, except ATP is converted into the form deoxyadenosine triphosphate (dATP) before becoming part of a DNA strand.
Other molecules are related to ATP and have similar names, such as adenosine diphosphate (ADP), adenosine monophosphate (AMP), and cyclic AMP (cAMP). In order to avoid confusion, it is important to know some differences between these molecules.
Adenosine diphosphate (ADP), which is sometimes also known as adenosine pyrophosphate (APP), especially in chemistry, has already been mentioned in this article. It differs from ATP because it has two phosphate groups. ATP becomes ADP with the loss of a phosphate group, and this reaction releases energy. ADP itself is formed from AMP. Cycling between ADP and ATP during cellular respiration gives cells the energy needed to carry out cellular activities.
Adenosine monophosphate (AMP), also called 5’-adenylic acid, has only one phosphate group. This molecule is found in RNA and contains adenine, which is part of the genetic code. It can be produced along with ATP from two ADP molecules, or by hydrolysis of ATP. It is also formed when RNA is broken down. It can be converted into uric acid, which is a component of urine, and excreted via the bladder.
Cyclic adenosine monophosphate (cAMP) is derived from ATP and is another messenger used for signal transduction and activating certain protein kinases. It can be broken down into AMP. cAMP pathways may play a role in certain cancers such as carcinoma. In bacteria, it has a role in metabolism. When a bacterial cell is not producing enough energy (from insufficient glucose, for example), high cAMP levels occur, and this turns on genes that use energy sources other than glucose.
Related Biology Terms
• Cellular respiration – Energy from nutrients is converted into ATP.
• Signal transduction – The transmission of signals from a cell’s outside to its inside.
• Hydrolysis – Breaking a bond in a molecule and splitting it into smaller molecules through a reaction with water.
• Kinase – An enzyme that transfers a phosphate group from ATP to another molecule.
1. How can ATP be produced?
A. Fermentation
B. Cellular respiration
C. Photophosphorylation
D. All of the above
Answer to Question #1
2. Where is ATP made in the cell?
A. Mitochondria
B. Nucleus
C. Ribosomes
D. Endoplasmic reticulum
Answer to Question #2
3. Adenine is found in what type of genetic material?
C. Both DNA and RNA
D. Neither DNA nor RNA
Answer to Question #3
Leave A Reply
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Contact Gregg S. Fisher
Personal Finance 3,918 views
Think An All-Bonds Portfolio Is Safest? Think Again
The idea that stocks are riskier than bonds is widely accepted at face value in finance and investing. Stock prices tend to swing both higher and lower, and more frequently, than bond prices, and unlike with a bond, owning shares in a company doesn’t come with a commitment that your investment principal will be paid back at a future date.
As Modern Portfolio Theory holds, to compensate for this higher risk, an investor in equities should expect to earn a higher rate of return over time than an investor in fixed income. This concept is generally called the “equity risk premium” and historically, broad indices of stocks have outperformed their fixed income counterparts, while experiencing much higher volatility in returns, also known as standard deviation (see Exhibit 1 below).
However, a popular misconception among many investors is that a portfolio invested only in fixed income is the “least risky” possible portfolio. This view ignores two key issues. First, not all bonds are created equal in terms of minimizing volatility and risk – a long-duration bond with poor credit quality typically has substantially higher volatility than a short-duration treasury. Second, by virtue of being assets that do not move in tandem (and may even move inversely), a mix of stocks and bonds can actually result in an overall portfolio with lower volatility than bonds alone.
Adding Return (and Risk) With Fixed Income
Risk and return are fundamentally linked: in order for an investor to expect to see a higher return, she needs to be willing to assume a greater level of risk, in terms of price volatility, liquidity, or otherwise. One of the easiest and most common methods that investors use to try and improve the returns of their fixed income portfolios is investing in higher-yielding bonds, typically bonds that have a longer maturity or lower credit quality (or both).
Unfortunately, as with any other asset class that offers investors the promise of an increased return, higher yielding bonds have correspondingly higher risk, specifically in the form of higher volatility (see Exhibit 2 below). Indeed, while moving from short- to long-term US government bonds in a trailing 30-year period did improve returns by just over two percentage points annualized, it also more than doubled volatility.
The question, therefore, isn’t whether an investor with a fixed income portfolio can improve his expected return, but how he can do so in a manner that adds the least risk to his core bond positions and minimizes the expected fluctuations in their asset values.
The Value of Diversification
One of the most powerful tools in the arsenal of any investor is the ability to spread her portfolio across many different types of assets, from stocks to bonds to alternatives such as real estate and commodities. Diversification works because different asset classes do not move in perfect tandem with each other, thus they have a tendency to counteract each other’s individual volatility.
This behavior is at the core of Modern Portfolio Theory, which was introduced by Harry Markowitz in 1952. The basic premise of this theory was that a combination of dissimilar assets will tend to have a potentially better risk-return profile than any individual asset alone. In the context of managing a portfolio heavily or fully invested in fixed income, therefore, investors should consider the possibility of managing their risk through careful management of the bonds as well as strategic allocations into other asset classes.
Even small allocations of individually volatile assets, such as equities or commodities, can help to reduce the overall portfolio risk of a bond investor.
Adding Equities and the Efficient Frontier
While there are countless ways to construct portfolio allocations – both in terms of the asset classes used and the relative weights or amounts an investor buys of each selected asset class – we can examine certain relationships among portfolio components using historical returns. Exhibit 3 (below) illustrates the risk and return characteristics of a series of allocations of three different asset classes, rebalanced quarterly: fixed income (represented by 5-year Treasuries), equities (represented by the S&P 500 Index), and a blended index of commodities.
Historically, as one increases the equity component of the portfolio and reduces exposure to bonds, both the risk and the return of the portfolio increase, as we would expect. However, with the addition of just a small allocation to equities and commodities (5% of each), we actually see a portfolio with both higher return and lower volatility than one composed purely of bonds.
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} | 1,124 | Author: Michael Furla, CFA,CFP®
TMG Director of Investment Management
Does it make sense to own bonds when they are paying historically low interest rates? Short answer, yes. There are four main benefits of owning bonds even in a low interest rate environment.
Benefits of Owning Bonds:
1. Diversification (bonds tend to rise when stocks fall)
2. Rebalancing (from bonds to equities, and vice versa)
3. Reduce Risk & Volatility (bonds are higher on the capital structure & less volatile)
4. Liability Matching (pre-fund future spending)
Diversification Benefit
Bonds are inversely correlated to stocks, meaning, stocks and bonds usually move in opposite directions. You can think of bonds as a counterweight to equities. For example, when stocks fall in price, bonds tend to not only maintain their value, but can even appreciate. This diversification benefit is quite important for long-term investors as it can help stabilize account values during tumultuous selloffs. As you can see in the below chart bonds were up 2% while equities were down 23% during the 2020 COVID-19 March selloff.
For Illustrative Purposes Only
Source: YCharts
Additionally, high credit quality bonds such as U.S. Treasuries, tend to be a safe haven asset class. During market selloffs investors tend to allocate heavily into treasuries, driving up their price.
For example, while yields on long-term treasuries are currently near historic lows (below 2%) the total return (yield + change in price) for long-term treasuries this year is an impressive 21.7% as of September 30th.2 Even with low bond yields, this has been an excellent year to own fixed income. Thus, it is important to remember that there is more to a bond return than just yield, price appreciation plays an important factor, especially during market selloffs. This leads us to our next benefit, rebalancing.
Rebalancing Benefit
Stocks and bonds generally move in opposite directions, during an equity market selloff, stocks can fall below their desired target weighting, which can cause bonds to become overweight. This mismatch allows us to trim appreciated bond holdings and invest in equities at depressed prices. This means bonds allow investors the ability to generate capital in order to “buy the dip” (i.e. buying equities when they are perceived to be below their intrinsic value) without having to invest new capital. Rebalancing is a fundamental component of portfolio management. The most meaningful rebalances occur between asset classes, equities and bonds, in order to maintain an appropriate level of portfolio risk, given an investor’s ability and willingness to take on risk.
Reduce Risk & Volatility
An allocation to bonds reduces the volatility of a portfolio’s performance given that bonds naturally have lower standard deviations (i.e. dispersion of returns) when compared to equities.3 For example, a 60/40 portfolio can have a 10-year standard deviation around 7%, while a 100% equity portfolio’s standard deviation can be much higher at approximately 15%.2,4 Additionally, when it comes to investing in companies, bonds are higher up on the capital structure, which means if a company were to go under and be liquidated, bond holders would receive payment before equity holders. Given this, there is less downside risk to bonds when compared to equities. Managing investment risk is vital when it comes to financial planning and long-term investing.
Liability Matching
What is Liability Matching? Liability Matching is the process of structuring high quality bonds to mature at the same time your liabilities (spending needs) come due, therefore, the liability is pre-funded and essentially eliminated. This tool can be used for funding college tuition, gifting, or even funding the first few years of retirement. This allows your other investments (equities) to grow unencumbered. Having a liability matching ladder can help investors who are taking distributions come out of a market selloff relatively unscathed, as they are using bond proceeds to fund their living expenses, which allows their equities to recover in value before they need to sell those securities for spending needs. Liability matching is an important tool for financial planning and it is most commonly done with treasury bonds or high quality investment grade municipal bonds.
In conclusion, bonds play an essential role when it comes to having a well diversified investment portfolio. These benefits include: diversification, rebalancing, reducing risk & volatility, and liability matching. While some market pundits believe bonds are a thing of the past, recent empirical data suggest bonds are still a key component to an investment portfolio. We at The Mather Group are here for you during these uncertain times and are always happy to discuss these topics in greater detail. Feel free to reach out to us with any questions or concerns you may have. We hope you and your loved ones have a safe and enjoyable holiday season.
Sources & Definitions
1 YCharts
2 Morningstar
3 Standard Deviation - Standard Deviation of returns measures the average a return series deviates from its mean. It is often used as a measure of risk. When a portfolio has a high standard deviation, the predicted range of performance implies greater volatility.
4 60/40 Portfolio – A 60/40 portfolio is an industry standard moderate risk portfolio, which signifies 60% equity holdings and 40% fixed income holdings.
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The Mather Group, LLC Acquires Chicago-Based Trinity Financial Advisors. #themathergroup #tmgacquisition | https://www.themathergroup.com/bond-diversification | isPartOf: CC-MAIN-2021-31
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} | 602 | The case for fixed income in the core of a portfolio, despite low rates
Sep 19, 2017
By BlackRock
Bonds have long played an essential role as a foundational holding at the core of investors’ portfolios. Bonds and bond ETFs have the potential to offer income and stable returns that can offset volatility
from a portfolio’s stocks.
But, in recent years, investors have struggled to achieve their investment goals amid low bond yields, especially from government bonds. The main cause? In response to the 2008 financial crisis, the U.S. Federal Reserve (and other central banks around the world) slashed interest rates to encourage economic growth.
While the Fed has since started to raise interest rates, they are still below historical averages. A low yield environment could be with us for some time because of several factors, including demographics (aging baby boomers have greater demand for bonds, potentially keeping interest rates low).
Beyond providing income potential it is important to emphasize that bonds and bond ETFs can play multiple roles in a portfolio.
These roles may include:
Recurring Income Stream
No matter if an investor is looking to grow wealth or save for retirement, generating income in a portfolio can help get an individual closer to reaching an investment goal. Investors can receive interest payments at a regular cadence, typically monthly, quarterly or annually, potentially providing stable income and strengthening total return in their portfolio.
Stability of Principal
In addition to receiving an income stream, bond investors receive the bond’s principal at maturity, assuming the bond is held to maturity and does not default. Repayment of the bond’s principal (a fixed amount) at a fixed time helps provide an investor with stability in their portfolio.
Potential hedge against risk
Bonds and bond ETFs can offer a potential hedge against increased equity market volatility. Historically, bonds have been more likely to move in the opposite direction to stocks. For example, fixed income investors have increased their allocations to U.S. Treasuries during equity market sell-offs as a potential safe haven investment.1
Correlation of Bond and Equity Returns
Chart: Fixed income ETFs correlations
Source: Thomson Reuters Datastream, chart by BlackRock as of 6/30/2017. Chart shows the correlation of daily returns of U.S. 10yr Treasury returns and S&P 500 over a rolling 90 day period. Correlation measures how two securities move in relation to each other. Correlation ranges between +1 and -1. A correlation of +1 indicates returns moved in tandem, -1 indicates returns moved in opposite directions, and 0 indicates no correlation.
Despite challenges that bond and bond ETF investors may face with yield and income in the short term, it is important to remember that fixed income investments can play a vital role as a foundational, long term holding, at the core of a portfolio.
While there are similarities between bonds and bond ETFs, there are also differences between the two investments. Investors should be diligent when researching the best investment vehicles for their portfolios. For example, individual bonds have set maturity dates while traditional bond ETFs do not. Bonds and bond ETFs may have different distribution schedules, despite tracking the same asset class, this may result in different income streams for investors. Individual bonds trade over-the-counter while bond ETFs trade on an exchange. Additionally, bonds and bond ETFs may create different tax liabilities and therefore investors may be subject to a variety of federal, local and/or capital gains taxes. Cost of ownership is another area where individual bonds and bond ETFs differ, bond investors may face a transaction and brokerage cost at the time of purchase whereas a bond ETF investor will likely pay both an expense ratio and transaction cost. | https://www.blackrock.com/latamiberia/insights/fixed-income-etf-low-rates | isPartOf: CC-MAIN-2018-34
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Rising Interest Rates are Good for Long-Term Bond Investors
| March 24, 2017
Share |
Contrary to what we often hear and read, rising interest rates are actually good for long-term bond investors. The financial media has succeeded in recent years at creating anxiety among investors about the effect rising interest rates will have on bonds, causing some investors to question the role of bonds in their portfolios. While the old adage “when interest rates go up, the value of existing bonds go down” holds true, it is only part of the story.
The other part of the story is that as rates go up, so too do the yields on new bonds added to the portfolio. A bond fund is always reinvesting the interest payments from the bonds it holds, as well as reinvesting the proceeds of maturing bonds into new bonds. When interest rates rise, that money is being invested in new bonds with higher yields, which eventually boosts the fund's return. It is simply a matter of time before the increased yield earned more than makes up for the initial market value loss the higher rates caused.
Let’s look at a hypothetical example* using some simplified bond math. Say an investor has a $1,000,000 bond portfolio invested in a low-cost bond mutual fund with a duration of approximately six years and a current yield of approximately 2.5%. Duration is a gauge of a bond fund's sensitivity to changes in interest rates, and is the best way to estimate how much of a decrease a bond fund’s price may take when rates rise. The duration measure of six years means the fund's price would drop roughly 6% for each one-percentage-point rise in interest rates. The Federal Reserve’s long-run (post-2019) target for the Fed Funds rate is approximately 2.5% higher than the current rate. To magnify the effects for illustrative purposes, let’s assume the whole 2.5% rate increase happens at once. Following is the math and a chart summarizing the results:
Source: Chart and Graph: Portfolio Solutions®; Data: Morningstar
Even in this extreme example, the bond investor would be better off with the increased interest rate prior to year seven. The general rule is if the duration of your assets (the bond fund) is shorter than the duration of your liabilities (the completion of retirement funding for most), then you benefit from rising rates.
Some investors incorrectly believe they can time bond markets by selling bonds before the Federal Reserve raises rates, then buy them back when they think the Federal Reserve is done increasing rates. The problem with this logic is that the Federal Reserve controls the Fed Funds Rate - the overnight rate on bank funds - and it has little direct effect on the price of most bonds. The rates bond investors should be concerned with are Treasury rates. The market for U.S. Treasury securities is by many measures the largest, most active debt market in the world, with enormous amounts of Treasury bonds traded every business day. Treasury bond rates go up and down daily based on the activities and beliefs of many market participants. Market expectations for the current and future actions of the Federal Reserve represent one of hundreds of other factors already priced into this market on a real-time basis. Correctly forecasting treasury markets is as difficult as trying to forecast the stock market.
Regardless of whether rates rise or not, bonds will always play an important role in a portfolio. Bonds are unique in that they have historically exhibited negative correlation with stocks. This means that as stock values decrease, the value of bonds tend to increase, and vice versa. Because of this characteristic, bonds tend to dampen the volatility of the stock market. Rather than avoiding bonds, one should instead be thinking about how best to allocate their portfolio between stocks and bonds. Ideally, investors should own the right balance of stocks for their individual situation to get the optimal long-term growth historically provided by stocks AND enough bonds to attempt to provide some stability and income for their portfolio and to mitigate the downside when stocks periodically slump.
At Liberty Wealth Advisors, we work closely with our clients to determine the proper mix of stocks and bonds for their portfolio. We believe investors should take only the amount of tolerable risk that is necessary to achieve their goals, and no more.
If you have questions about your asset allocation, the role of bonds in your portfolio, your investment time horizon or any other topics please don’t hesitate to contact Mike Parry. It is our pleasure to serve you.
Investment advisory services offered through Liberty Wealth Advisors LLC.
Investors should consider the investment objectives, risks and charges, and expenses of the fund carefully before investing. The prospectus contains this and other important information about the fund. Contact your registered representative or the issuing company to obtain a prospectus, which should be read carefully before investing or sending money.
Share | | https://www.libertywealthadvisors.com/blog/rising-interest-rates-are-good-for-long-term-bond-investors | isPartOf: CC-MAIN-2019-39
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} | 838 | Bonds: Getting Kicked Off the Playground
June 15, 2013
Most financial advisors have typically recommended that investors allocate a certain percentage of their portfolio to bonds. Depending on your age, risk tolerance, and income needs, that percentage may range from 25-40% or even higher. Historically, bonds have not only supplied steady income to a portfolio, but have also reduced overall risk levels.
Those recommendations are now changing. Many advisors are suggesting limiting exposure to bonds, especially longer term ones, and some are advocating getting out of bonds altogether. Why the change in opinion?
It’s all about interest rates.
Bond prices have an inverse relationships to interest rates. That means as interest rates go down, bond prices go up. As you can see from the following chart, interest rates have been going down for over 30 years, ever since their peak in the 1980’s. This has created a golden age in bond investing.
Fed funds rate 1950-2013
But now interest rates appear to be about as low as they possibly can get. In fact, rates have been approaching zero. Why? Because when interest rates spiked up during the 2008 financial crisis, the Federal Reserve began its quantitative easing program. This meant the Fed bought up lots of Treasury bonds and mortgage-backed securities (MBS). Their purchases drove prices up, and interest rates down.
The market now feels the Fed is likely to taper off its bond purchases. This will decrease demand for bonds, pushing bond prices lower and interest rates higher.
Longer term bonds are more sensitive to interest rate changes.
Longer term bonds are more sensitive to interest rate changes than shorter term ones. This sensitivity is called duration. The concept can be illustrated in the seesaw below. Long term bonds sit at one end of the seesaw. Long term interest rates sit at the other end. As the seesaw moves, the ends move much more than the center.
This means that as interest rates go up, long term bond prices will go down the most. Medium and shorter term bonds, which are nearer the fulcrum of the seesaw, will go down less.
How do these changes impact your investments?
The chart below compares returns for three Vanguard bond exchange traded funds as of 5/30/2013, a long term bond fund BLV, an intermediate term bond fund BND, and a short term bond fund BSV. (These funds were chosen for illustrative purposes only. There are many bond funds and exchange traded funds available. I am not making a recommendation regarding any of them).
Vanguard bond returns
What does this chart tell you?
• That year to date, if you are invested in these funds, you are losing money.
• The longer term your bond fund, the more money you are losing. The long term BLV is down 3.7% year to date, while the intermediate term BND is down 1.01% and the short term BSV is down 0.02%.
So what should you do to generate income in your portfolio?
• If you want to invest in a bond fund, focus on short-to-intermediate duration funds. The shorter term bond funds will pay out a lower interest rate, but they will go down less as interest rates rise.
• Trim your exposure to long term bonds, but do not sell all your holdings. Bond prices have already moved down in consensus anticipation of higher interest rates. If the Fed goes against consensus and announces it does not plan to taper its bond purchases, then rates will soften and bond prices will go up. Delay new purchases of long term bonds until there is more clarity on the future direction of rates.
• Consider investing in individual bonds which you can hold until maturity, rather than in bond funds or ETFs. Consult your financial advisor to structure a bond ladder composed of various bonds of different maturities. Note that you will probably need to invest at least $200,000 to achieve a diversified bond portfolio.
• Seek income from other sources, such as dividend-paying stocks, preferred stocks and real estate investment trusts (REITs). The prices of these investments also have interest rate sensitivity, which I will discuss in future articles.
When is the best time to buy bonds?
Remember that the best time to buy bonds is when interest rates are high but headed lower. In that situation, buy longer term bonds, which will go up more as interest rates go down.
The worst time to buy bonds is when interest rates are low and headed higher, which appears to be where we are now. All bond prices will go down, but longer term bonds will go down the most. If you want to buy bonds in a rising interest rate environment, buy shorter term ones.
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} | 1,021 | Best Bond Funds for Rising Interest Rates
Bond Fund Types to Beat Interest Rates and Inflation
Document listing interest rates
Glow Images, Inc. / Getty Images
Finding the best bond funds for rising interest rates and inflation can be easy if you know what types of funds to look for. When interest rates are on the rise and seem destined to continue in that trend, learning how to invest for higher rates is a smart move.
For decades, bond prices were rising for the most part, which was positive for returns on bond mutual funds. But when interest rates climb, the bull market for bonds typically come to an end.
But this doesn't mean bond funds don't have a place in your portfolio. And it doesn't mean you should sell your bond funds just because the market is changing. You simply need to find the best bond funds when rates are rising. You also should learn which bond funds do best against inflation.
Learn the basics on which funds perform best and which funds perform worst before and during higher interest rates and inflation.
How Are Bonds Related to Interest Rates and Inflation?
The reasons that bonds are sensitive to interest rates and inflation are often explained in a way that's tough to understand. But it doesn't have to be that difficult. Here are the main points you need to know to help you build the best portfolio of mutual funds:
• The Federal Reserve Board raises interest rates when it fears inflation will result from a growing economy. It also lowers rates to fight deflation, a slowing economy, or both.
• These higher rates are called the federal funds rate. This is charged to banks by the Federal Reserve to increase the costs of borrowing for banks. This indirectly pushes them to pass on these costs to their customers. In other words, the interest charged on most loan types will increase after the Fed raises its rates.
• Bonds are essentially loans. If prevailing interest rates on loans, including bonds, are rising, bond investors tend to demand the higher-yielding bonds to make more money on their bond investments.
• When bond investors want newer bonds that pay higher interest, the older bonds that paid lower rates become less attractive to investors. Why buy a bond that pays 6% when you can get a similar bond that pays 6.5%? When bond investors want to sell their older bonds that pay lower rates, they are forced to sell the bond for a lower price than they bought it. That's because the investor buying it will want a discount for taking on the lower interest rate.
Bond prices move in the opposite direction of interest rates because of the impact that new rates have on the old bonds. When rates are rising, new bond yields are higher and more attractive to investors. On the other hand, the old bonds with lower yields are less attractive. This forces prices lower.
The main thing to remember is that rising interest rates equals lower bond prices.
How Do Rising Rates Affect Bonds?
There's one more key point to know about the relationship between bond prices and interest rates. Bonds with longer maturities are more sensitive to interest rates than bonds with shorter ones. For instance, if interest rates are rising, who wants to own the bonds paying lower rates for even longer periods of time? The longer the maturity, the greater the interest-rate risk.
Let's take a look at certificates of deposit (CDs). When the new CDs come out with higher yields, the CD investor wants to replace the old with the new. Savvy CD investors buy CDs with shorter maturities (one year or less) if they expect rates to keep rising over the next year. Bond investing when rates are rising follows the same logic.
Best Bond Funds for Rising Interest Rates and Inflation
Now you know the basics about bonds and interest rates. Here are some specific bond fund types that can do better than others when rates are rising.:
• Short-term bonds: Rising interest rates make prices of bonds go down. But the longer the maturity, the further prices will fall. And the opposite is also true: Bonds of shorter maturities do better than those with longer maturities when interest rates are rising because of their prices. Keep in mind that "doing better" may still mean falling prices; however, the decline is often less severe. A few bond funds that work well include PIMCO Low Duration D (PTLDX) and Vanguard Short-Term Bond Index (VBISX).
• Intermediate-term bonds: Although the maturities are longer with these funds, no one really knows what interest rates and inflation will do. Intermediate-term bond funds can provide a good option if you choose not to predict what the bond market will do in the short term. For instance, even the best fund managers thought inflation (and lower bond prices) would return in 2011. That would have brought on higher interest rates and made short-term bonds more attractive. But those fund managers were wrong. They lost to index funds, such as Vanguard Intermediate-Term Bond Index (VBIIX), which beat 99% of all other intermediate-term bond funds in 2011. Bond funds generally didn't fall in price for a full year until 2013. You can also try a more diversified approach with a total bond market index exchange-traded fund (ETF), such as iShares Barclay's Aggregate Bond (AGG).
• Inflation-protected bonds: These are also known as Treasury Inflation-Protected Securities (TIPS). These bond funds can do well just before and during inflationary environments, which often coincide with rising interest rates and growing economies. A standout fund for TIPS is Vanguard Inflation-Protected Securities Fund (VIPSX).
The best bond funds for rising rates are not guarantees of positive returns in that kind of economy. But these types of bond funds do have lower interest-rate risk than most other types of bond funds.
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Bond Fund Types to Beat Interest Rates and Inflation
interest rates
••• Getty Images
For decades, bond prices were generally rising, which was positive for returns on bond mutual funds. But in recent years, as interest rates began to climb from their historic lows, the bull market for bonds ended.
But this doesn't mean bond funds aren't an important part of a diversified portfolio and it certainly doesn't mean investors should sell their bond funds now. Investors simply need to find the best bond funds in a rising interest rate environment and to understand which bond funds do better against inflation.
Knowing the basics on which funds perform best and which funds perform worst before and during higher interest rates and inflation is a crucial skill for the bond mutual fund investor.
How Bonds Are Related to Interest Rates and Inflation
The reasons that bonds are sensitive to interest rates and inflation are often made too difficult to understand. To simplify the concepts you need to know for building the best portfolio of mutual funds, here are the main points:
• The Federal Reserve Board raises interest rates when it fears inflation will result from a growing economy. Conversely, it lowers interest rates to fight deflation, a slowing economy, or both. This article is about the best bond funds for rising interest rates...
• These higher rates, called the Federal Funds Rate, charged to banks by the Federal Reserve increase costs of borrowing (the cost of money) for banks, which indirectly pushes them to pass on these costs to their customers, such as individual consumers, corporations, and other banks. In different words, the interest charged on most loan types will increase after the Fed increases its rates.
• Bonds are essentially loans. If prevailing interest rates on loans, including bonds, are rising, bond investors tend to demand the higher yielding bonds to make more money on their bond investments.
• When bond investors are more attracted to the newer bonds that pay higher interest, the older bonds that paid lower interest become less attractive to investors. Why buy a bond that pays 6 percent when you can get a similar bond that pays 6.5 percent? Therefore, when bond investors want to sell their older bonds that pay lower interest rates, they are forced to sell the bond for a lower price than they bought it because the investor buying it will want a discount for accepting the lower interest rate.
In summary, bond prices move in the opposite direction of interest rates because of the effect that new rates have on the old bonds. When interest rates are rising, new bond yields are higher and more attractive to investors while the old bonds with lower yields are less attractive, thereby forcing prices lower.
If all of this is still difficult to understand, don't worry! You're normal! All you really need to remember is that rising interest rates equals lower bond prices.
Example of How Rising Interest Rates Affect Bonds
Another key point to understand about the relationship between bond prices and interest rates is that bonds with longer maturities are more sensitive to interest rates than bonds with shorter maturities. For example, if interest rates are rising, who wants to own the bonds paying lower interest for even longer periods of time? The longer the maturity, the greater the interest-rate risk.
A simple example here is with certificates of deposit (CDs). When the new CDs come out with higher yields, the CD investor wants to replace the old with the new. In addition, savvy CD investors buy CDs with shorter maturities (one year or less) if they expect rates to continue rising over the next year. Bond investing in a rising interest rate environment follows the same logic.
Best Bond Funds for Rising Interest Rates and Inflation
Now that you know the basics on bonds and interest rates, here are some specific bond fund types that can do better than others in an environment of rising interest rates and inflation:
• Short-term bonds: Rising interest rates make prices of bonds go down, but the longer the maturity, the further prices will fall. Therefore the opposite is true: bonds of shorter maturities do better than those with longer maturities in a rising interest rate environment because their prices. However, keep in mind that "doing better" may still mean falling prices, although the decline is generally less severe. A few bond funds that work well include PIMCO Low Duration D (PLDDX) and Vanguard Short-term Bond Index (VBISX).
• Intermediate-term bonds: Although the maturities are longer with these funds, no investor really knows what interest rates and inflation will do. Therefore, intermediate-term bond funds can provide a good middle-of-the-road option for investors who wisely choose not to predict what the bond market will do in the short term. For example, even the best fund managers thought inflation (and lower bond prices) would return in 2011, which would bring on higher interest rates and make short-term bonds more attractive. They were wrong and fund managers lost to index funds, such as Vanguard Intermdiate-term Bond Index (VBIIX), which beat 99% of all other intermediate-term bond funds in 2011. Bond funds generally didn't fall in price for a full calendar year until 2013. You can also try a more diversified approach with a total bond market index exchange-traded fund (ETF), such as iShares Barclay's Aggregate Bond (AGG).
• Inflation-protected bonds: Also known as Treasury Inflation-Protected Securities (TIPS), these bond funds can do well just before and during inflationary environments, which often coincide with rising interest rates and growing economies. A standout fund for TIPS is Vanguard Inflation Protected Securites Fund (VIPSX).
In summary, the best bond funds for rising interest rates are not guarantees of positive returns in that kind of economic environment, but these types of bond funds do have lower interest-rate risk than most other types of bond funds.
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Bond fund purchases require knowledge, strategy
NEW YORK - Bond funds are getting a higher profile after years of being outshone by their more glamorous stock counterparts.
While stock prices weaken, bonds have been among the few mutual fund categories to show higher returns this year. But most experts say the decision to buy bond funds should reflect a broader financial strategy and not just a desire to outsmart the market.
"I don't think a lot of people realize how much they need to know before investing in bonds," said Daniel Roe, a financial planner in Columbus, Ohio. "The swings in bonds generally won't be as great as stocks, but you can still lose money in them."
Bonds, seen as a more conservative investment than stocks, are IOUs issued by a government or corporation to raise money. Investors who buy bonds do so on the assumption they'll get their original investment plus interest back on a certain date. The interest level is set when a bond is purchased, but the actual return may vary depending on the issuer's performance.
What's tricky about bonds is understanding how their performance - which includes the fixed interest payments plus any changes in the underlying value of the bond - correlates with the direction of interest rates in the financial markets.
Bond prices fall as interest rates rise because people might be able to find a comparable or better payoff through a different investment such as money market funds. The lower price helps make bonds more competitive.
Conversely, as interest rates fall, bonds get more pricey.
Mr. Roe, the Ohio planner, prefers bond funds to individual bonds because they spread money across the sector, instead of focusing on a few issues.
Some bond funds are actively managed, while others merely index the market. They're usually recommended for people 10 to 15 years away from retirement or for investors looking for a place to stow cash they expect to use in two to five years.
"They are also good for people who can't tolerate the volatility you normally see in stocks, although in most cases, if you have the time, you should be in stocks not bonds," Mr. Roe said.
Investors should keep four key criteria in mind when selecting bond funds, which are also called fixed income funds:
Maturity. Bond funds, like bonds, come in short, intermediate and long-term varieties depending on when they come due. Performance can also be tied to maturity. Long-term bonds and bond funds usually offer higher yields to compensate investors for tying their money up for longer periods.
Credit quality. Knowing the credit rating of the bonds in a fund can help investors identify the true risk level of their investment - in other words, whether they're likely to get their money back when the bond matures.
For example, so-called "junk bonds," the lowest-rated corporate bonds, offer higher yields that pump up a fund's performance, but not all investors may be comfortable with the higher risk they carry. Standard & Poor's and Moody's are among the best known services that rate the creditworthiness of bonds.
Diversification. As with stocks, investors need to make sure their bonds are diversified in terms of type, industry and maturity among other factors. A broad index fund may suffice or investors may want to investigate more specialized offerings.
Costs. Beware of high management fees. "Once you get over about 0.6 percent fee for management, you should start getting a little nervous," Mr. Roe said.
Tax consequences also can be an issue.
Interest on municipal bond funds tends to be exempt from federal taxes and, if the holder lives in the municipality, also may be exempt from state and local taxes. There are some tradeoffs, however.
"The yields on them are lower because the market is adjusting for the tax rate," said Bob Auwaerter, a senior fixed income manager at the Vanguard Group. "But if you're in a high-income bracket, they may be a good choice."
Ultimately, investors need to approach buying a bond fund the same way they would purchase any other mutual fund. Experts say investors need to research and to learn bond terminology, which is different from the vocabulary used to talk about stocks. Also, they should ask questions of brokers, financial advisers or fund companies.
Above all, they stress, the decision to buy bonds should be part of specific financial goals, rather than just an impulse response to the weakness in the stock market.
"It's dangerous to time the markets. People who are fleeing stocks for bond funds are potentially making a mistake," said Eric Tyson, author of Mutual Funds for Dummies. | http://chronicle.augusta.com/stories/2001/04/08/bus_311526.shtml | robots: classic
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In Bonds, Funds Are The Volatile Option
August 04, 1996|By Jane Bryant Quinn, Washington Post Writers Group.
If you cheer when the economy fades, you're probably a bond investor. Slower growth means fewer fears that price inflation will increase. Interest rates probably will fall, which means that bond prices will rise.
You saw that happen late last month. The news about slower retail sales gave the bond market a lift.
When you think about buying bonds, you may have bond mutual funds at the top of your mind--especially if you own stock mutual funds. Owning a bond fund seems to be a logical extension.
But funds aren't always the best choice, especially for investors whose stomachs knot every time the market drops. Depending on your needs, you might be better off with individual bonds.
Bond prices can be volatile. In 1994 and '95, the market price of long-term bonds (maturities of 20 years or more) fluctuated, up and down, by more than 20 percent. When interest rates go up, prices fall. That has sometimes shocked inexperienced investors, who grabbed what was left of their money and ran.
They might not have done so had they owned individual bonds. If you can hold to maturity, it's safer than any bond fund can be.
A bond mutual fund is a mix of many different bonds. The fund is run by professionals, who troll for the best returns in the market consistent with their investment objective.
The price of a bond fund fluctuates daily. You can sell anytime and receive the published market price, which may be more or less than you originally paid. Minimum initial investment: typically $1,000 to $3,000. Dividends are paid monthly. You can reinvest them in the fund automatically.
Individual bonds work differently. You buy from a stockbroker, unless you're buying U.S. Treasury issues, in which case you have the option to buy directly from a Federal Reserve bank or branch. The bonds have fixed terms, running anywhere from one to 30 years, and typically pay interest semiannually. Minimum initial investment for new bonds: $1,000 or $5,000 for Treasuries (depending on term); $5,000 for corporates or tax-free municipals.
Individual bonds also fluctuate in price, but investors rarely pay attention. If you sell before maturity, you'll receive the current market price, which, as with bond funds, could either be more or less than you originally paid. If you hold to maturity, however, you're guaranteed your principal back--something bond funds never do.
Individual bonds are good choices for safety-minded investors, who can hold for the long term and want interest income with no risk to principal. Bond funds are good choices for people who want to be able to sell at any time.
There's one more thing to consider, however, before deciding between bonds and funds. Some types of bonds are better suited to one or the other type of investment. Here's a quick rundown from Sheldon Jacobs, editor of The No-Load Fund Investor in Irvington-on-Hudson, N.Y.:
U.S. Treasury bonds: In most cases, there's no point in buying Treasury-bond funds. You don't need professional management because all these bonds are sound. So why pay sales and management fees? You can buy, at no cost, through the government program known as Treasury Direct (for information, call 1-202-874-4000).
Ginnie Maes: These mortgage-backed bonds, insured by the federal government, yield slightly more than Treasuries. Here, a mutual fund makes sense. Ginnie Maes are complex and involve periodic returns of the capital you invested. You benefit from the automatic reinvestment of your money, and from the manager's choice of which bonds to buy.
High-yield (junk) bonds: A fund is a must. Junk bonds have paid excellent returns but there's a higher-than-average risk that they'll default. You want broad diversification, under the eye of an experienced manager.
Tax-free municipals: Long-term investors, who know they can hold to maturity, might buy individual bonds. But stick with the highest quality (AA and up) and try to invest at least $25,000 per issue.
To feel sure that you're getting a fair price, buy newly issued bonds, not older bonds whose price your broker can mark up. And stick with terms that you know you can hold to maturity. If you have to sell before maturity, you may not receive a very good price. Investors with small amounts of money, and those who might have to sell at any time, should stick with tax-free mutual funds. | http://articles.chicagotribune.com/1996-08-04/business/9608040336_1_bond-funds-individual-bonds-bond-prices | robots: classic
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June 8, 2011
Explore different options when purchasing bonds
So let's look at three popular ways of owning bonds.
Individual bonds: When you buy an individual bond, you will receive predictable interest payments. And when your bond matures, you'll get the original principal back, unless the issuer defaults, which is not common in cases of "investment grade" bonds.
However, the value of your bond — the price you could get for it if you sold it on the open market before it matures — will fluctuate over time, primarily in response to interest rates. (When market rates go up, the value of your bond drops, and vice versa.) In general, you'll pay at least $5,000 for an individual bond, though that amount may vary.
Consequently, while this approach gives you more control, it can be more time-consuming and require a larger investment in order to build a diverse fixed-income portfolio.
Bond funds: By investing in a bond-based mutual fund, which may own dozens of different types of bonds, you can efficiently increase your diversification, which is important, because diversification can help reduce credit risk (although it can't guarantee a profit or protect against a loss).
A bond fund does not pay you a fixed rate of return; instead, you receive dividends, which will fluctuate based on the underlying bonds' interest rates and capital appreciation. In addition, bond funds don't have a maturity date when principal is repaid. Keep in mind that when you purchase bond funds, you could be subject to capital gains taxes in two different ways: if you sell your fund shares for a profit or if the fund manager sells an underlying bond for more than it's worth.
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June 8, 2011
Explore different options when purchasing bonds
As an investor, you may find that bonds can be a valuable part of your holdings. But there's more than one way to own bonds, so you'll want to be familiar with the various investment vehicles available — because the more you know, the better the choices you'll be able to make.
So let's look at three popular ways of owning bonds.
Individual bonds: When you buy an individual bond, you will receive predictable interest payments. And when your bond matures, you'll get the original principal back, unless the issuer defaults, which is not common in cases of "investment grade" bonds.
However, the value of your bond — the price you could get for it if you sold it on the open market before it matures — will fluctuate over time, primarily in response to interest rates. (When market rates go up, the value of your bond drops, and vice versa.) In general, you'll pay at least $5,000 for an individual bond, though that amount may vary.
Consequently, while this approach gives you more control, it can be more time-consuming and require a larger investment in order to build a diverse fixed-income portfolio.
Bond funds: By investing in a bond-based mutual fund, which may own dozens of different types of bonds, you can efficiently increase your diversification, which is important, because diversification can help reduce credit risk (although it can't guarantee a profit or protect against a loss).
A bond fund does not pay you a fixed rate of return; instead, you receive dividends, which will fluctuate based on the underlying bonds' interest rates and capital appreciation. In addition, bond funds don't have a maturity date when principal is repaid. Keep in mind that when you purchase bond funds, you could be subject to capital gains taxes in two different ways: if you sell your fund shares for a profit or if the fund manager sells an underlying bond for more than it's worth.
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Photos of the Week | http://www.hgazette.com/business/x494184436/Explore-different-options-when-purchasing-bonds | robots: classic
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