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Around 97% of all water on earth is what type of water? | rivers water | excess water | fresh water | salt water | The Water Cycle Water is essential for all living processes. The human body is more than one-half water and human cells are more than 70 percent water. Thus, most land animals need a supply of fresh water to survive. Of the stores of water on Earth, 97.5 percent is salt water (Figure 20.9). Of the remaining water, 99 p... |
Which type of diabetes is more common? | type 1 | gestational diabetes | juvenile diabetes | type 2 | Type 2 diabetes is much more common than type 1 diabetes. Type 2 diabetes occurs when body cells no longer respond normally to insulin. The pancreas still makes insulin, but the cells of the body can’t use it. Being overweight and having high blood pressure increase the chances of developing type 2 diabetes. This type ... |
All waves are the way energy travels through what? | space | time | vacuums | matter | All waves are the way energy travels through matter. Ocean waves are energy traveling through water. They form when wind blows over the surface of the ocean. Wind energy is transferred to the sea surface. Then, the energy is carried through the water by the waves. Figure below shows ocean waves crashing against rocks o... |
What is the cause of behavioral difference between populations? | genetic wavelengths | environmental factors | electromagnetic differences | genetic differences | |
What is the term for the process in which glucose is made using light energy? | compress | glycolysis | hydration | photosynthesis | Most living things use glucose for energy. The process in which glucose is made using light energy is photosynthesis. Water and carbon dioxide are needed for this process, and oxygen is produced as a byproduct. Photosynthetic organisms include plants, algae, and some bacteria. |
Skeletal muscle tissue is arranged in bundles surrounded by this? | soft tissue | cartilage | epithelial tissue | connective tissue | develops from myoblasts derived from the mesoderm. Myocytes and their numbers remain relatively constant throughout life. Skeletal muscle tissue is arranged in bundles surrounded by connective tissue. Under the light microscope, muscle cells appear striated with many nuclei squeezed along the membranes. The striation i... |
What element on the periodic table forms the most diverse compounds? | hydrogen | helium | oxygen | carbon | Life on Earth is based on carbon. A possible explanation is that no other element in the periodic table forms compounds that are so diverse in their chemistry and physical properties. Discuss the chemistry of carbon with regard to. |
As the number of unpaired electrons increases, what happens to the magnetic moment? | gets smaller | is destroyed | remains the same | gets larger | Magnetic Moments of Molecules and Ions Experimental evidence of magnetic measurements supports the theory of high- and low-spin complexes. Remember that molecules such as O2 that contain unpaired electrons are paramagnetic. Paramagnetic substances are attracted to magnetic fields. Many transition metal complexes have u... |
What kind of container is used to measure heat changes during a chemical reaction or physical process? | graduated cylinder | hydrostatic | thermal flask | calorimeter | Calorimetry is the measurement of the transfer of heat into or out of a system during a chemical reaction or physical process. A calorimeter is an insulated container that is used to measure heat changes. The majority of reactions that can be analyzed in a calorimetry experiment are either liquids or aqueous solutions.... |
In the mammal family, what is the name for hoofed animals, such as deer, sheep, goats, pigs, buffalo, elephants and giraffes? | rodents | primates | bovines | ungulates | Ungulates include hoofed animals, such as deer, sheep, goats, pigs, buffalo, elephants and giraffes ( Figure below ). These mammals use their hoofs to sustain their whole body weight while moving. Hoofs are formed by a thick nail rolled around the tip of the toe. |
In the nematic phase, only the long axes of the molecules are parallel, and the ends are staggered at random intervals. in the smectic phase, the long axes of the molecules are parallel, and the molecules are also arranged in planes. finally, in thecholesteric phase, the molecules are arranged in layers; each layer is ... | symmetry | layer structure | kinetic energy | spiral structure | In the nematic phase, only the long axes of the molecules are parallel, and the ends are staggered at random intervals. In the smectic phase, the long axes of the molecules are parallel, and the molecules are also arranged in planes. Finally, in thecholesteric phase, the molecules are arranged in layers; each layer is ... |
What term means the force of attraction that holds together oppositely charged ions? | solvent bond | electron bond | magnetic bond | ionic bond | An ionic bond is the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals instead of molecules. Table salt contains ionic bonds. |
In single-celled organisms, plasma membrane extensions, such as whip-like flagella or brush-like cilia, aid in what? | pressure | sensation | sound | movement | The plasma membrane may have extensions, such as whip-like flagella or brush-like cilia. In single-celled organisms, like those shown in Figure below , the membrane extensions may help the organisms move. In multicellular organisms, the extensions have other functions. For example, the cilia on human lung cells sweep f... |
What is defined as male gametes that form in the testes and mature in the epididymis? | stereocilia | plasma | mucus | sperm | Sperm are male gametes that form in the testes and mature in the epididymis. |
All planets exhibit the same or nearly the same direction and shape of what path around the sun? | nucleus | revolution | ellipse | orbit | To figure out how the solar system formed, we need to put together what we have learned. There are two other important features to consider. First, all the planets orbit in nearly the same flat, disk-like region. Second, all the planets orbit in the same direction around the Sun. These two features are clues to how the... |
What do you call a change in the dna or rna sequence? | infection | degradation | adaptation | mutation | Mutations, a change in the DNA or RNA sequence, may have no effect, may be beneficial or may be harmful. There are numerous ways that the genetic information can be changed. Some of these changes can be inherited. In multicellular organisms, mutations can be subdivided into germline mutations , which can be passed on t... |
What is produced when hydrogen gas and oxygen gas are ignited? | air | liquid | Fire | water | Hydrogen gas and oxygen gas are ignited to produce water. |
What is the term for the buildup of electric charge on an object, which can be transferred to another when touched? | static cling | electromagnetic electricity | electric potential | static electricity | Static electricity is a buildup of electric charges on objects. It occurs when electrons are transferred from one object to another. |
What is the basis of the classification of protists? | tails shared | conditions shared | mutations shared | traits shared | Protists are classified based on traits they share with other eukaryotes. There are animal-like, plant-like, and fungus-like protists. The three groups differ mainly in how they get carbon and energy. |
What is the movement of animals from one place to another called? | extinction | evacuation | hibernation | migration | Migration is the movement of animals from one place to another. Migration is most common in birds, fish, and insects. In the Northern Hemisphere, many species of birds, such as finches and swallows, travel south for the winter. They migrate to areas where it is warmer and where more food is available. They return north... |
What does the respiratory system exchange between the body and the outside air? | nutrients | fluids | blood | gases | The job of the respiratory system is the exchange of gases between the body and the outside air. This process, called respiration , actually consists of two parts. In the first part, oxygen in the air is drawn into the body and carbon dioxide is released from the body through the respiratory tract. In the second part, ... |
In the body, second in volume to intracellular fluid is what type of fluid, which surrounds cells that are not blood cells? | watery fluid | circuitry fluid | concomitant fluid | interstitial fluid | Figure 26.4 A Pie Graph Showing the Proportion of Total Body Fluid in Each of the Body’s Fluid Compartments Most of the water in the body is intracellular fluid. The second largest volume is the interstitial fluid, which surrounds cells that are not blood cells. |
How many sperm does it take to fertilize an egg? | 4 | 3 | 2 | 1 | It might only take one sperm to fertilize an egg, but that sperm is not alone. Hundreds of millions of sperm can be released during sexual intercourse. |
The volume of a regularly shaped solid can be calculated from its what? | mass | layers | density | dimensions | The volume of a regularly shaped solid can be calculated from its dimensions. For example, the volume of a rectangular solid is the product of its length, width, and height. |
What is approximately the average stroke volume in humans? | 75 ml | 80 ml | 65 ml | 70 ml | |
Systemic communication through the phloem helps integrate the functions of the whole what? | insect | bird | animal | plant | |
What structure shows the bonding between atoms, with dots representing available electrons? | string theory | Mendelian model | Pascal model | lewis structure | Draw the Lewis electron dot diagram for each substance. Double or triple bonds may be needed. |
What is a thick, dark brown or black liquid found in rock layers of the earth's crust? | coal | propane | fossil fuel | oil | Oil is a thick, dark brown or black liquid. It is found in rock layers of Earth's crust. Oil is currently the most commonly used source of energy in the world. |
What are indestructible and constantly in motion? | ions | viruses | crystals | atoms | Atoms are indestructible and constantly in motion. |
What kind of reaction do you see when the concentration of reactants is higher? | constant reaction rate | regular reaction rate | slow reaction rate | faster reaction rate | Concentration is the number of particles of a substance in a given volume. When the concentration of reactants is higher, the reaction rate is faster. At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react. Did you ever see a sign like the one in the F... |
What part of a plant protects the plant cell, maintains its shape, and prevents excessive uptake of water? | root | chloroplasm | stem | wall | |
The process of splitting atoms creates what kind of waste? | safe | recyclable | inert | radioactive | Nuclear power is clean. It does not pollute the air. However, the use of nuclear energy does create other environmental problems. Uranium must be mined ( Figure below ). The process of splitting atoms creates radioactive waste. This waste may be dangerous for thousands or hundreds of thousands of years. As yet, there i... |
Chromosomal alterations are mutations that change what? | discovery structure | Skeleton Structure | detected structure | chromosome structure | Chromosomal alterations are mutations that change chromosome structure. They occur when a section of a chromosome breaks off and rejoins incorrectly or does not rejoin at all. Possible ways these mutations can occur are illustrated in Figure below . Go to this link for a video about chromosomal alterations: http://www.... |
When an atom gains or loses an electron it becames an? | neutron | electron | photon | ion | Sometimes atoms lose or gain electrons. Then they become ions . Ions have a positive or negative charge. That’s because they do not have the same number of electrons as protons. If atoms lose electrons, they become positive ions, or cations. If atoms gain electrons, they become negative ions, or anions. |
What is a type of cell that supports neurons and maintains their environment? | interneuron cell | axon cell | neurofilament cell | glial cell | Figure 35.7 Glial cells support neurons and maintain their environment. Glial cells of the (a) central nervous system include oligodendrocytes, astrocytes, ependymal cells, and microglial cells. Oligodendrocytes form the myelin sheath around axons. Astrocytes provide nutrients to neurons, maintain their extracellular e... |
The coordinated activities of the legume and the rhizobium bacteria depend on what between the partners? | fertilizer signals | electric signals | sight signals | chemical signals | |
The purpose of scientific investigations generally is to test a what? | suggestion | theory | question | hypothesis | Although this cartoon pokes fun at scientific hypotheses, the concept of hypothesis is one of the most important in science. Scientific investigations discover evidence that helps science advance, and the purpose of scientific investigations generally is to test hypotheses. Finding evidence to support or disprove hypot... |
The most common curved mirrors are what? | convex | solid | concave | spherical | Reflecting surfaces do not have to be flat. The most common curved mirrors are spherical. A spherical mirror is called a concave mirror if the center of the mirror is further from the viewer than the edges are. A spherical mirror is called a convex mirror if the center of the mirror is closer to the viewer than the edg... |
What type of tissue covers the outside of a plant in a single layer of cells called the epidermis? | anterior | dorsal | mucous | dermal | The three types of plant cells are found in each of the major types of plant tissues: dermal, ground, and vascular tissues. Dermal tissue covers the outside of a plant in a single layer of cells called the epidermis. It mediates most of the interactions between a plant and its environment. Ground tissue makes up most o... |
In a molecular compound, electrons are shared between atoms in which type of bond? | corrosion | Ionic | deformation | covalent | The electron loss and gain is easy to see in a reaction in which ions are formed. However, in many reactions, no such electron transfer occurs. In a molecular compound, electrons are shared between atoms in a type of bond called a covalent bond. Yet it is still common for reactions involving molecular compounds to stil... |
What process does water undergo to leave behind dissolved substances? | ascension | accumulation | oxidation | evaporation | Minerals form from dissolved substances when water evaporates. |
What type of proteins bind to foreign substances and attempt destruction? | antigens | membranes | ribosomes | antibodies | Proteins play many important roles in living things. Some proteins help cells keep their shape, and some make up muscle tissues. Many proteins speed up chemical reactions in cells. Other proteins are antibodies, which bind to foreign substances such as bacteria and target them for destruction. Still other proteins carr... |
Photosynthesis involves reactions that are dependent on what? | food | air | water | light | 8.2 | The Light-Dependent Reactions of Photosynthesis By the end of this section, you will be able to: • Explain how plants absorb energy from sunlight • Describe short and long wavelengths of light • Describe how and where photosynthesis takes place within a plant How can light be used to make food? When a person turn... |
Like simple hormone pathways, hormone cascade pathways typically involve what kind of feedback? | neutral | effective | positive | negative | |
The ocean basin begins where the ocean meets what? | river | sea | bay | land | The ocean basin begins where the ocean meets the land. The continental margin begins at the shore and goes down to the ocean floor. It includes the continental shelf, slope, and rise. The continental shelf is part of the continent, but it is underwater today. It is about 100-200 meters deep, much shallower than the res... |
What causes cobalt chloride to turn pink? | h20 + ions | discussed 2 + ions | show 2 + ions | co 2+ ions | A solution of cobalt chloride in water is pink due to the presence of the solvated Co 2+ ion. If sufficient HCl is added, the solution turns blue as the CoCl 4 2- ion forms. The reaction can be shifted back to the pink form if more water is added to the solution. |
What bodily defense can be acquired in an active or passive way, and can be natural or artificial? | nerves | skin | membrane | immunity | Immunity can be acquired in an active or passive way, and it can be natural or artificial. Watch this video (http://openstaxcollege. org/l/immunity) to see an animated discussion of passive and active immunity. What is an example of natural immunity acquired passively?. |
Like the stem, what basic plant structure contains vascular bundles composed of xylem and phloem? | bark | root | flower | leaf | Like the stem, the leaf contains vascular bundles composed of xylem and phloem (Figure 30.27). The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. The phloem transports the photosynthetic products from the leaf to the other parts of the plant. A single vascular bundle, no matt... |
What kind of symmetry do echinoderm larvae have? | spherical | internal | radial | bilateral | |
Reducing waste, as well as reusing and recycling resources, can help save what? | coral resources | eletrical resources | artificial resources | natural resources | Reducing waste, as well as reusing and recycling resources, can help save natural resources. |
What is a person who studies the frequency and distribution of disease within human populations and environments called? | anthropologist | biologist | entymologist | epidemiologist | Epidemiologist Epidemiology is the study of the occurrence, distribution, and determinants of health and disease in a population. It is, therefore, part of public health. An epidemiologist studies the frequency and distribution of diseases within human populations and environments. Epidemiologists collect data about a ... |
In adaptive radiation, what is the name of the initial species that then subsequently becomes multiple other ones? | Mother | pioneer | father | founder | In some cases, a population of one species disperses throughout an area, and each finds a distinct niche or isolated habitat. Over time, the varied demands of their new lifestyles lead to multiple speciation events originating from a single species, which is called adaptive radiation. From one point of origin, many ada... |
The structures of both trifluoramine and hydroxylamine are similar to that of what? | nitrogen | hydrogen | magnesium | ammonia | The structures of both trifluoramine and hydroxylamine are similar to that of ammonia. |
What protects reptiles from drying out? | hairs | sweat | skin | scales | Reptiles also have several adaptations for living on land. They have a skin covered in scales to protect them from drying out. All reptiles have lungs to breathe air. Reptiles are also amniotes , which means their embryos are surrounded by a thin membrane. This membrane protects the embryo from the harsh conditions of ... |
How many chromosomes do bacterial dna have? | one simple chromosome | one rectangular chromosome | one triangular chromosome | one circular chromosome | Bacteria lack many of the structures that eukaryotic cells contain. For example, they don't have a nucleus. They also lack membrane-bound organelles, such as mitochondria or chloroplasts. The DNA of a bacterial cell is also different from a eukaryotic cell. Bacterial DNA is contained in one circular chromosome, located... |
What makes blue cheese blue? | rennit | mites | rot | fungus | Have you ever eaten blue cheese? Do you know what makes it blue? You guessed it. A fungus. For certain types of cheeses, producers add fungal spores to milk curds to promote the growth of mold, which makes the cheese blue. Molds used in cheese production are safe for humans to eat. |
What type of evolution often happens in species that have symbiotic relationships? | spontaneous evolution | retrogression | succession | coevolution | Coevolution often happens in species that have symbiotic relationships. Examples include flowering plants and their pollinators. |
Helicopter pilots can recover from piloting errors by decreasing altitude, turning some of their potential energy into what kind of energy? | active | electrical | free | kinetic | Helicopter pilots are quite familiar with rotational kinetic energy. They know, for example, that a point of no return will be reached if they allow their blades to slow below a critical angular velocity during flight. The blades lose lift, and it is impossible to immediately get the blades spinning fast enough to rega... |
Rise divided by run is called what? | mound | hill | steep | slope | Carrying this one step further, we note that the slope of a velocity versus time graph is acceleration. Slope is rise divided by run; on a v vs. t graph, rise = change in velocity Δv and run = change in time Δt . The Slope of v vs. t The slope of a graph of velocity. |
Where did west nile first appear? | Southeast Asia | Central America | North Africa | north america | The first case of West Nile virus in North America occurred in 1999. Within just a few years, the virus had spread throughout most of the United States. Birds as well as humans can be infected with the virus. Birds often fly long distances. This is one reason why West Nile virus spread so quickly. |
How do cancer cells typically spread from one part of the body to another? | liver | plasma | kidneys | bloodstream | Sometimes cancer cells break away from a tumor. If they enter the bloodstream, they are carried throughout the body. Then, the cells may start growing in other tissues. This is usually how cancer spreads from one part of the body to another. Once this happens, cancer is very hard to stop or control. |
The rate of the accumulation of neutral what serves as a type of population-based biological clock? | eukaryotes | prokaryotic | enzymes | polymorphisms | would not be surprised if the surviving populations experienced serious bottlenecks. The subsequent diversification of the surviving organisms, such as the Dinosauria (which includes the extinct dinosaurs and modern birds) and the Cynodontia, which includes the ancestors of modern mammals, including us, could be due in... |
The transmitted light strikes a photoelectric tube, which converts the light energy to? | gas | heat | color | electricity | |
About how many grams of carbohydrates are in a typical apple? | 25 | 30 | 35 | 20 | An apple contains about 20 grams of carbohydrates. How much energy does it provide?. |
What is the smallest unit of a chemical element called? | nucleus | cell | droplet | atom | An atom is the smallest unit of a chemical element . That is, an atom has all the properties of that element. All atoms of the same element have the same number of protons. |
What is the term for a scalar measure of how quickly an object is moving along this line? | force | velocity | motion | speed | One dimensional motion describes objects moving in straight lines. Speed is a scalar measure of how quickly an object is moving along this line. Velocity is speed with a direction, making it a vector. If an object’s velocity changes with time, the object is said to be accelerating. When restricted to one dimension, the... |
A redox reaction rearranges what subatomic particles? | protons | neutrons | water molecules | electrons | A combination reaction makes a new substance from more than one reactant; a redox reaction rearranges electrons. Not all combination reactions are redox reactions, and not all redox reactions are combination reactions. |
What substances digest the food in the vacuole of an ingestive protist? | hormones | carbohydrates | lipids | enzymes | Ingestive protists ingest, or engulf, bacteria and other small particles. They extend their cell wall and cell membrane around the food item, forming a food vacuole. Then enzymes digest the food in the vacuole. |
What type of force allows non-polar molecules to interact? | graviitational force | experienced dispersion | centrifigal dispersion | london dispersion | Non-polar molecules can interact by way of London dispersion forces. |
What is a thin layer of bacteria that sticks to a surface? | a monofilm | a choanocyte | a spicule | a biolfilm | A biofilm is a thin layer of bacteria that sticks to a surface. Cells in a biofilm are all alike, but they may play different roles, such as taking in nutrients or making the “glue” that sticks the biofilm to the surface. The sticky plaque that forms on teeth is a biofilm of bacterial cells. |
The amount of water vapor in the air and the temperature of the medium affects how fast what travels? | traffic | colour | light | sound | The speed of sound also depends on the temperature of the medium. For a given medium such as air, sound has a slower speed at lower temperatures. You can compare the speed of sound in air at different temperatures in Table below . A lower temperature means that particles of the medium are moving more slowly, so it take... |
An rna codon reading guu encodes for what? | arginine | glycine | carbon | valine | This chart shows the genetic code used by all organisms. For example, an RNA codon reading GUU would encode for a valine (Val) according to this chart. Start at the center for the first base of the three base codon, and work your way out. Notice that more than one codon may encode for a single amino acid. For example, ... |
Scanning acoustic microscopes use what kind of waves to scan a specimen? | gamma waves | radio waves | heat waves | sound waves | Scanning acoustic microscopes use sound waves to scan a specimen. These microscopes are useful in biology and medical research. |
The contents of which organ are mixed every 20 seconds? | kidney | the metabolism | pancreas | the stomach | |
How many chambers are in a reptiles heart? | five | ten | two | three | Reptiles are a class of ectothermic, tetrapod vertebrates. They have several adaptations for living on dry land, such as tough keratin scales and efficient lungs for breathing air. They also have a three-chambered heart and relatively well-developed brain. |
What is the opening in the front of the eye called? | iris | lens | cornea | pupil | The pupil is an opening in the front of the eye. It looks black because it doesn’t reflect any light. All the light passes through it instead. The pupil controls the amount of light that enters the eye. It automatically gets bigger or smaller to let more or less light in as needed. |
When salinity and pressure increase, or when temperature decreases, what happens to water density? | stays the same | fluctuates | drops | increases | Water density increases as salinity and pressure increase, or as temperature decreases. |
The bending of a wave around the edges of an opening or an obstacle is called this? | absorption | reflection | sputtering | diffraction | contain the carbonyl functional group (C=O; part (a) in Figure 24.14 "The Oxidation State of Carbon in Oxygen- and Nitrogen-Containing Functional Groups"). Alcohols are classified as primary, secondary, or tertiary, depending on whether the –OH group is bonded to a primary, secondary, or tertiary carbon. For example, t... |
What controls the shape of a developing zygote early in its development? | DNA | chromosomes | storage genes | gap genes | Gap genes control the shape of a developing zygote early in its development. Gap mutants are missing segments in their embryos. These genes are highly regulated. |
What happens to structural genes in the presence of tryptophan? | they are exterminated | they are not oxidised | they are transcribed | they are not transcribed | Structure of the trp operon. The trp operon is composed of 5 structural genes, 1 regulatory gene and other regulatory sequences, including the promoter, operator and leader sequence. Within the leader sequence is the attenuator region. In the presence of tryptophan, the structural genes are not transcribed. |
What type of pressure may build up inside the cell when water moves into a cell by osmosis? | transverse pressure | pleasurable pressure | impervious pressure | osmotic pressure | When water moves into a cell by osmosis, osmotic pressure may build up inside the cell. If a cell has a cell wall, the wall helps maintain the cell’s water balance. Osmotic pressure is the main cause of support in many plants. When a plant cell is in a hypotonic environment, the osmotic entry of water raises the turgor... |
What is the process by which plants make their own food called? | fission | fusion | atherosclerosis | photosynthesis | |
Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals? | organisms | atoms | phases | elements | Strategy: A Based on the conductivity of the elements, determine whether each is a metal, a nonmetal, or a semimetal. Confirm your prediction from its physical appearance. B From the compounds each element forms, determine its common oxidation states. C If the element is a nonmetal, it must be located in the p block of... |
What specific part of the brain regulates the endocrine system? | frontal lobe | parietal lobe | hippocampus | hypothalamus | The endocrine system consists of glands that secrete hormones into the bloodstream. It is regulated by a part of the brain called the hypothalamus, which also secretes hormones. The hypothalamus controls the pituitary gland, which is called the “master gland” of the endocrine system because its hormones regulate other ... |
Chemical reactions follow which laws? | Archie's law | Physics Analysis | Chemical kinetics | thermodynamics | Chemical reactions follow the laws of thermodynamics. The First Law of Thermodynamics states that energy can be changed from one form to another, but it cannot be created or destroyed. This law is also known as the Law of Conservation of Energy. The Second Law of Thermodynamics states the energy available after a chemi... |
There are three basic types of hormones: lipid-derived, amino acid-derived, and what? | acidic | manipulated | secreted | peptide | CHAPTER SUMMARY 37.1 Types of Hormones There are three basic types of hormones: lipid-derived, amino acid-derived, and peptide. Lipid-derived hormones are structurally similar to cholesterol and include steroid hormones such as estradiol and testosterone. Amino acid-derived hormones are relatively small molecules and i... |
Fertilization occurs when an egg and sperm come together to form a what? | eukaryote | cell | infant | zygote | Fertilization occurs when an egg and sperm come together to form a zygote. |
The explosion of nitroglycerin, which releases large volumes of gases, is what type of reaction? | endothermic | energetic | exponential | exothermic | The explosion of nitroglycerin releases large volumes of gases and is very exothermic. |
What done ozone help protect against? | helium rays | gamma rays | x-rays | ultraviolet rays | Ozone (O 3 ) depletion in the atmosphere is of significant concern. This gas serves as a protection against the ultraviolet rays of the sun. Ozone is naturally depleted in addition to the depletion caused by human-made chemicals. The depletion reaction is a two-step process:. |
What category of food includes sugars, starches and fibers? | alcohols | enzymes | proteins | carbohydrates | Carbohydrates include sugars, starches, and fiber. Sugars and starches are used by the body for energy. One gram of carbohydrates provides 4 Calories of energy. Fiber, which is found in plant foods, cannot be digested but is needed for good health. Simple carbohydrates are small carbohydrates found in foods such as fru... |
What are substances that the body needs for energy, building materials, and control of body processes? | acids | molecules | carbons | nutrients | Nutrients are substances that the body needs for energy, building materials, and control of body processes. Carbohydrates, proteins, lipids, and water are nutrients needed in relatively large amounts. Vitamins and minerals are nutrients needed in much smaller amounts. |
What law shows the relationships among temperature, volume, and pressure? | Law of Conservation | Newton's law | Murphy's Law | combined gas | The combined gas law shows the relationships among temperature, volume, and pressure. |
What 2 things keep polar bears warm in their arctic ecosystem? | camouflage, blubber | hibernation, thick fur | colourful fur , blubber | thick fur, blubber | Thick fur and a layer of blubber keep polar bears warm in their Arctic ecosystem. Why do you think their fur is white? Why might it be an adaptation in an Arctic biome?. |
What two things are a phospholipid molecules composed of? | hemophillic head, and substrate tails | hydrophillic head , and adhesion tails | hydrophillic head , and substrate tails | hydrophillic head , and hydrophobic tails | Figure 5.3 This phospholipid molecule is composed of a hydrophilic head and two hydrophobic tails. The hydrophilic head group consists of a phosphate-containing group attached to a glycerol molecule. The hydrophobic tails, each containing either a saturated or an unsaturated fatty acid, are long hydrocarbon chains. |
When plants reproduce, the offspring has characteristics similar to the? | siblings | grandparents | cousins | parents | |
Algae are like plants mainly because they contain what? | cell wall | organelles | cells | chloroplasts | Algae are like plants mainly because they contain chloroplasts. This allows them to make food by photosynthesis. Algae are important producers in water-based ecosystems such as the ocean. On the other hand, algae lack other plant structures. For example, they don’t have roots, stems, or leaves. Also unlike plants, some... |
The radius of an atom is defined as one-half the distance between the nuclei in a molecule consisting of two identical atoms joined by what? | hydrogen bond | metallic bond | ionic bond | covalent bond | Figure 6.31 (a) The radius of an atom is defined as one-half the distance between the nuclei in a molecule consisting of two identical atoms joined by a covalent bond. The atomic radius for the halogens increases down the group as n increases. (b) Covalent radii of the elements are shown to scale. The general trend is ... |
What is it called when a mistake occurs in dna replication. | radiation | adaptation | degradation | mutation | Mutations have many possible causes. Some mutations occur when a mistake is made during DNA replication or transcription. Other mutations occur because of environmental factors. Anything in the environment that causes a mutation is known as a mutagen . Examples of mutagens are shown in Figure below . They include ultra... |
Birds are thought to have evolved around 150 million years ago from what? | parrot dinosaurs | teradactils | raptor dinosaurs | theropod dinosaurs | Birds are thought to have evolved from theropod dinosaurs around 150 million years ago. |
The mostly subterranean lifestyle of stone plants reduces water loss from evaporation and inhibits what? | tissues | reactions | chlorophyll | photosynthesis |
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