questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
What is the process in which cells break down glucose, release the stored energy, and use it to make atp
Here are the choices:
A. reproduction
B. cellular respiration
C. electromagnetic respiration
D. photosynthesis | 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. | B: cellular respiration. |
Dew point is the temperature at which what occurs?
Here are the choices:
A. combustion
B. condensation
C. fermentation
D. precipitation | When air is very humid, it doesn’t have to cool very much for water vapor in the air to start condensing. The temperature at which condensation occurs is called the dew point. The dew point varies depending on air temperature and moisture content. It is always less than or equal to the actual air temperature, but warme... | B: condensation. |
In what type of diabetes can the pancreas still make insulin, but the cells of the body cannot use it efficiently?
Here are the choices:
A. type 1 diabetes
B. type 3 diabetes
C. type A diabetes
D. type 2 diabetes | Type 2 diabetes occurs when body cells are no longer sensitive to insulin. The pancreas may still make insulin, but the cells of the body cannot use it efficiently. Being overweight and having high blood pressure increase the chances of developing type 2 diabetes. Type 2 diabetes usually develops in adulthood, but it i... | D: type 2 diabetes. |
What are the two classifications of factors in the environment that affect organisms?
Here are the choices:
A. biotic and abiotic
B. rotational and abiotic
C. Antibiotick and abiotic
D. shear and abiotic | Organisms depend on their environment to meet their needs, so they are greatly influenced by it. There are many factors in the environment that affect organisms. The factors can be classified as either biotic or abiotic. | A: biotic and abiotic. |
What do increasing greenhouse gas concentrations in the air do to the earth's temperature?
Here are the choices:
A. raise it
B. stable it
C. Lower it
D. Pollute | A: raise it. | |
What is the name of a microorganism that is considered important for living resources in all ecosystem?
Here are the choices:
A. pathogens
B. archaea
C. bacteria
D. protozoa | Microorganisms such as bacteria are important living resources in all ecosystems. They recycle nutrients and other matter. | C: bacteria. |
What bone cell is responsible for forming new bone and is found in the growing portions of bone, including the periosteum and endosteum?
Here are the choices:
A. epithelial
B. fibroblasts
C. congenial
D. osteoblast | The osteoblast is the bone cell responsible for forming new bone and is found in the growing portions of bone, including the periosteum and endosteum. Osteoblasts, which do not divide, synthesize and secrete the collagen matrix and calcium salts. As the secreted matrix surrounding the osteoblast calcifies, the osteobla... | D: osteoblast. |
Individuals with what condition experience depigmentation that results in lighter colored patches of skin?
Here are the choices:
A. eczema
B. dementia
C. vitiligo
D. psoriasis | Figure 5.10 Vitiligo Individuals with vitiligo experience depigmentation that results in lighter colored patches of skin. The condition is especially noticeable on darker skin. (credit: Klaus D. Peter). | C: vitiligo. |
What do decomposers release back to the environment after they break down the remains and other wastes?
Here are the choices:
A. unrefined waste
B. carbon monoxide
C. simple inorganic molecules
D. nematodes | When organisms die, they leave behind energy and matter in their remains. Decomposers break down the remains and other wastes and release simple inorganic molecules back to the environment. Producers can then use the molecules to make new organic compounds. The stability of decomposers is essential to every ecosystem. ... | C: simple inorganic molecules. |
What are the areas between cells that either allow or prevent the movement of materials called?
Here are the choices:
A. corners
B. junctions
C. receptors
D. sections | Junctions are areas between cells that either allow or prevent the movement of materials. Junctions are usually composed of numerous proteins, forming a large molecular complex. Gap junctions, desmosomes and tight junctions are three examples of junctions. | B: junctions. |
Arguably the most important ingredient in saliva for digestion is a type of what, which initiates the breakdown of carbohydrates?
Here are the choices:
A. genes
B. fatty
C. enzyme
D. amino | Saliva Saliva is essentially (95.5 percent) water. The remaining 4.5 percent is a complex mixture of ions, glycoproteins, enzymes, growth factors, and waste products. Perhaps the most important ingredient in salvia from the perspective of digestion is the enzyme salivary amylase, which initiates the breakdown of carboh... | C: enzyme. |
What element can form two different compounds with oxygen?
Here are the choices:
A. carbon
B. H20
C. hydrogen
D. dioxide | Carbon can form two different compounds with oxygen. | A: carbon. |
Each protein has its own unique sequence and shape held together by chemical interactions. if the protein is subject to changes in temperature, ph, or exposure to chemicals, the protein structure may change, losing its shape in what is known as this?
Here are the choices:
A. fermentation
B. gastrulation
C. extraction
D... | Each protein has its own unique sequence and shape held together by chemical interactions. If the protein is subject to changes in temperature, pH, or exposure to chemicals, the protein structure may change, losing its shape in what is known as denaturation as discussed earlier. Denaturation is often reversible because... | D: denaturation. |
Because they can cause diseases in plants, some parasitic fungi are considered what?
Here are the choices:
A. viral
B. pathogenic
C. toxic
D. bacterial | B: pathogenic. | |
What is another common term for single-unit smooth muscle?
Here are the choices:
A. abnormal muscle
B. energies muscle
C. lateral muscle
D. visceral muscle | Smooth muscle is organized in two ways: as single-unit smooth muscle, which is much more common; and as multiunit smooth muscle. The two types have different locations in the body and have different characteristics. Single-unit muscle has its muscle fibers joined by gap junctions so that the muscle contracts as a singl... | D: visceral muscle. |
What is the term for the horizontal displacement of a projectile from its starting point?
Here are the choices:
A. Distance
B. type
C. produce
D. range | In projectile motion, the horizontal displacement of an object from its starting point is called its range. | D: range. |
What types of stimuli control endocrine activity?
Here are the choices:
A. light and pressure
B. pressure and chemical
C. chemical and neural
D. temperature and light | Role of Endocrine Gland Stimuli Reflexes triggered by both chemical and neural stimuli control endocrine activity. These reflexes may be simple, involving only one hormone response, or they may be more complex and involve many hormones, as is the case with the hypothalamic control of various anterior pituitary–controll... | C: chemical and neural. |
What events, resulting in death of over half of animal species, have occurred on earth at least five times in the past 540 million years?
Here are the choices:
A. mass extinctions
B. microevolutions
C. mass migrations
D. spontaneous mutations | Since life began on Earth, there have been several major mass extinctions. If you look closely at the geological time scale, you will find that at least five major mass extinctions have occurred in the past 540 million years. In each mass extinction, over 50% of animal species died. The total number of mass extinctions... | A: mass extinctions. |
What is most of the water used in agriculture used for?
Here are the choices:
A. construction
B. sowing
C. cleaning
D. irrigation | Many crops are grown where there isn’t enough rainfall for plants to thrive. For example, crops are grown in deserts of the American southwest. How is this possible? The answer is irrigation. Irrigation is any way of providing extra water to plants. Most of the water used in agriculture is used for irrigation. Livestoc... | D: irrigation. |
What is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel called?
Here are the choices:
A. embolus
B. clots
C. atherosclerosis
D. thrombus | thrombosis, can be caused by excessive numbers of platelets. A thrombus is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel, whereas an embolus is a thrombus that has broken free from the vessel wall and is circulating in the bloodstream. | D: thrombus. |
Acidity is measured on what kind of scale?
Here are the choices:
A. pneumatic scale
B. ph scale
C. caloric scale
D. electromagnetic scale | Acidity is measured on a pH scale. Rain that is 5.0 or less on that scale is considered acid rain. | B: ph scale. |
What is the enclosed, fluid-filled membrane that surrounds and protects the fetus and is attached to the placenta?
Here are the choices:
A. epithelial sac
B. womb
C. amniotic sac
D. umbilical sac | Attached to the placenta is the amniotic sac , an enclosed membrane that surrounds and protects the fetus. It contains amniotic fluid , which consists of water and dissolved substances. The fluid allows the fetus to move freely until it grows to fill most of the available space. The fluid also cushions the fetus and he... | C: amniotic sac. |
Alzheimer’s disease is a disease that occurs mainly in what population?
Here are the choices:
A. older adults
B. younger adults
C. white adults
D. female adults | Alzheimer’s disease is another disease that occurs mainly in older adults. In Alzheimer’s disease, a person gradually loses most normal mental functions. The patient typically suffers from increasing memory loss, confusion, and mood swings. The cause of Alzheimer’s isn’t known for certain, but it appears to be associat... | A: older adults. |
What do sudoriferous glands secrete?
Here are the choices:
A. moving
B. tissue
C. sweat
D. water | Sweat Glands When the body becomes warm, sudoriferous glands produce sweat to cool the body. Sweat glands develop from epidermal projections into the dermis and are classified as merocrine glands; that is, the secretions are excreted by exocytosis through a duct without affecting the cells of the gland. There are two t... | C: sweat. |
Group 15 of the periodic table is also called which group?
Here are the choices:
A. oxygen
B. hydrogen
C. nitrogen
D. potassium | Group 15 of the periodic table is also called the nitrogen group. The first element in the group is the nonmetal nitrogen (N), followed by phosphorus (P), another nonmetal. Arsenic (As) ( Figure below ) and antimony (Sb) are the metalloids in this group, and bismuth (Bi) is a metal. All group 15 elements have five vale... | C: nitrogen. |
Humans need lipids for many vital functions such as storing energy and forming what?
Here are the choices:
A. enzymes
B. ionic bonds
C. cell membranes
D. zygotes | Humans need lipids for many vital functions such as storing energy and forming cell membranes. Lipids can also supply cells with energy. In fact, a gram of lipids supplies more than twice as much energy as a gram of carbohydrates or proteins. Lipids are necessary in the diet for most of these functions. Although the hu... | C: cell membranes. |
What bond is a force of attraction between ions and atoms?
Here are the choices:
A. chemical bond
B. Ionic bond
C. radiation bond
D. carbon bond | A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. | A: chemical bond. |
What type of cells are the smallest of all human cells?
Here are the choices:
A. meristematic
B. dna
C. egg
D. sperm | Sperm are tiny cells. In fact, they are the smallest of all human cells. They have a structure that suits them well to perform their function. | D: sperm. |
Vertebrates also require relatively large quantities of calcium and phosphorus for building and maintaining what?
Here are the choices:
A. brain cells
B. bone
C. metabolism
D. blood | B: bone. | |
What contains most of the structures found in skin?
Here are the choices:
A. dermis
B. subcutaneous layer
C. epidermis
D. basal layer | Structures of the Dermis. The dermis contains most of the structures found in skin. | A: dermis. |
What is the study of matter and energy referred to as?
Here are the choices:
A. physical science
B. biology
C. cosmology
D. geology | Physical science is the study of matter and energy. It includes chemistry, which focuses on matter, and physics, which focuses on energy. | A: physical science. |
What do you call the ability of a particular electrochemical cell to generate an electric current?
Here are the choices:
A. kinetic energy
B. electromagnetism
C. electrical potential
D. momentum | The ability of a particular electrochemical cell to generate an electric current is called its electrical potential. Reduction potentials measure the tendency of a substance to be reduced in a redox reaction. | C: electrical potential. |
What is a controlled scientific study of specific variables called?
Here are the choices:
A. variation
B. experiment
C. example
D. practicum | An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. | B: experiment. |
What happened to earth's species during the permian period?
Here are the choices:
A. mass extinction
B. duplication
C. evolution
D. division | The Permian Period ended with Earth’s second mass extinction. During this event, most of Earth’s species went extinct. It was the most massive extinction ever recorded. It’s not clear why it happened. One possible reason is that a very large meteorite struck Earth. Another possibility is the eruption of enormous volcan... | A: mass extinction. |
Which organ in the body controls the amount of water loss in urine in response to maintaining homeostasis?
Here are the choices:
A. kidneys
B. liver
C. lungs
D. spleen | The boy in Figure below is working out on a hot day. He’s losing a lot of water in sweat. To maintain homeostasis, his body can balance the water lost in sweat by excreting less water in urine. The amount of water lost in urine is controlled by the kidneys. The kidneys are organs of excretion. | A: kidneys. |
What is corrosive mixture is formulated by the combination of water, air and sulfur?
Here are the choices:
A. hydrochloric acid
B. nitric acid
C. sulfuric water
D. sulfuric acid | Surface mining exposes minerals that were underground to air and water at the surface. These minerals contain the chemical element sulfur. Sulfur mixes with air and water to make sulfuric acid. This acid is a highly corrosive chemical. Sulfuric acid gets into nearby streams and can kill fish, plants, and animals. Surfa... | D: sulfuric acid. |
What type of pollutants enter the air directly?
Here are the choices:
A. secondary
B. liquid
C. primary
D. carbon | Primary pollutants enter the air directly. Some are released by natural processes, like ash from volcanoes. Most are released by human activities. Carbon oxides are released when fossil fuels burn. | C: primary. |
What type of reaction is a process in which some substances, called reactants, change into different substances, called products?
Here are the choices:
A. physical reaction
B. toxic reaction
C. reversible reaction
D. chemical reaction | A chemical reaction is a process in which some substances, called reactants, change into different substances, called products. During the reaction, chemical bonds break in the reactants and new chemical bonds form in the products. | D: chemical reaction. |
What is the number placed in front of a chemical symbol or formula that shows how many atoms or molecules of the substance are involved in the reaction?
Here are the choices:
A. frequency
B. coefficient
C. note
D. requirement | Coefficients are used to balance chemical equations. A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. | B: coefficient. |
Through what does urine enter the bladder?
Here are the choices:
A. the ureters
B. the tubules
C. the vas deferens
D. the enterocytes | Nephrons filter about ¼ cup of body fluid per minute. In a 24-hour period, nephrons filter 180 liters of fluid, and 1.5 liters of the fluid is released as urine. Urine enters the bladder through the ureters. Similar to a balloon, the walls of the bladder are stretchy. The stretchy walls allow the bladder to hold a larg... | A: the ureters. |
The male and female reproductive system is regulated by follicle-stimulating hormone (fsh) and luteinizing hormone (lh) produced by what gland?
Here are the choices:
A. pituitary
B. adrenal
C. testes
D. thyroid | 17.8 Gonadal and Placental Hormones The male and female reproductive system is regulated by follicle-stimulating hormone (FSH) and luteinizing hormone (LH) produced by the anterior lobe of the pituitary gland in response to gonadotropin-releasing hormone (GnRH) from the hypothalamus. In males, FSH stimulates sperm matu... | A: pituitary. |
How do plants grow?
Here are the choices:
A. through cell growth and cell division
B. through pollination and cell division
C. through cell growth and sexual reproduction
D. through mitosis and cell division | Most plants continue to grow throughout their lives. Like other multicellular organisms, plants grow through a combination of cell growth and cell division. Cell growth increases cell size. Cell division increases the number of cells. | A: through cell growth and cell division. |
What part of the brain is attached to the brain stem but considered a separate region of the adult brain?
Here are the choices:
A. parietal lobe
B. frontal lobe
C. temporal lobe
D. cerebellum | Brain Stem The midbrain and hindbrain (composed of the pons and the medulla) are collectively referred to as the brain stem (Figure 13.12). The structure emerges from the ventral surface of the forebrain as a tapering cone that connects the brain to the spinal cord. Attached to the brain stem, but considered a separate... | D: cerebellum. |
Plants are described by what term, meaning their cells have a nucleus and membrane-bound organelles?
Here are the choices:
A. complex
B. eukaryotic
C. prokaryotic
D. walled | Plants are multicellular and eukaryotic, meaning their cells have a nucleus and membrane-bound organelles. | B: eukaryotic. |
What is a primary source of the hormone melatonin?
Here are the choices:
A. thyroid gland
B. pineal gland
C. thymus
D. pituitary gland | B: pineal gland. | |
How many more times likely are men to suffer from iron overload?
Here are the choices:
A. two times
B. twenty times
C. ten times
D. eight times | C: ten times. | |
Misfolding of polypeptides is a serious problem in what?
Here are the choices:
A. lipids
B. cells
C. muscles
D. blood | B: cells. | |
What does the inner membrane divide into two internal compartments?
Here are the choices:
A. chitin
B. epidermis
C. golgi apparatus
D. mitochondrion | D: mitochondrion. | |
Defined as total distance traveled divided by elapsed speed, average speed is a scalar quantity that does not include what?
Here are the choices:
A. pressure
B. shift
C. size
D. direction | • Average speed is the total distance traveled divided by the elapsed time. (Average speed is not the magnitude of the average velocity. ) Speed is a scalar quantity; it has no direction associated with it. | D: direction. |
Lymph capillaries collect fluid that leaks out of what?
Here are the choices:
A. blood capillaries
B. lymph nodes
C. bladder
D. alveoli | Lymph capillaries collect fluid that leaks out from blood capillaries. The lymphatic vessels return the fluid to the cardiovascular system. | A: blood capillaries. |
Action potentials occur whenever a depolarization increases the membrane voltage to a particular value called what?
Here are the choices:
A. threshold
B. fraction
C. ohms
D. velocity | A: threshold. | |
Programmed cell death is also known as?
Here are the choices:
A. sepsis
B. necrosis
C. apoptosis
D. suicide | C: apoptosis. | |
What happens to the mass number during a nuclear decay process by positron emission?
Here are the choices:
A. it rises
B. remains unchanged
C. it increases
D. it decreases | During a nuclear decay process that occurs by positron emission, a proton is converted into a neutron and a positron. The neutron remains in the nucleus, and the positron is expelled. Overall, the atomic number of the parent nucleus increases by one, and the mass number is unchanged. For example, carbon-11 emits a posi... | B: remains unchanged. |
Embryos usually don't survive if they have extra or too few of these genetic units?
Here are the choices:
A. chromosomes
B. genes
C. ribosomes
D. phenotypes | Outside of chromosome 21 and the sex chromosomes, most embryos with extra chromosomes do not usually survive. Because chromosomes carry many, many genes, a disruption of a chromosome can cause severe problems with the development of a fetus. Individuals with one (or more) fewer chromosome usually don't survive either. ... | A: chromosomes. |
Like the other outer planets, neptune has rings of ice and what?
Here are the choices:
A. mercury
B. dust
C. glass
D. gas | Like the other outer planets, Neptune has rings of ice and dust. These rings are much thinner and fainter than Saturn's. Neptune's rings may be unstable. They may change or disappear in a relatively short time. | B: dust. |
In an electromagnetic wave, what do the crests and troughs represent?
Here are the choices:
A. vibrating fields
B. oscillating fields
C. ocean waves
D. particles fields | The black line represents the straight path of the light itself. Along this path, there exists an electric field that will reach a maximum positive charge, slowly collapse to zero charge, and then expand to a maximum negative charge. Similarly, there is an changing magnetic field that oscillates from maximum north pole... | B: oscillating fields. |
What biome is located between the temperate and tropical biomes?
Here are the choices:
A. Desert
B. mountainous
C. Tropical
D. subtropical | Latitude means how far a biome is from the equator. Moving from the poles to the equator, you will find (in order) Arctic, boreal, temperate, subtropical, and tropical biomes. | D: subtropical. |
Metabolism is the sum of all catabolic and which other reactions in the body?
Here are the choices:
A. abolic
B. systic
C. inbolic
D. anabolic | CHAPTER REVIEW 24.1 Overview of Metabolic Reactions Metabolism is the sum of all catabolic (break down) and anabolic (synthesis) reactions in the body. The metabolic rate measures the amount of energy used to maintain life. An organism must ingest a sufficient amount of food to maintain its metabolic rate if the organi... | D: anabolic. |
Diarrhea due to food poisoning is an example of a problem involving what organ system?
Here are the choices:
A. muscular system
B. digestive system
C. skeletal system
D. lung system | Much of the time, you probably aren’t aware of your digestive system. It works well without causing any problems. But most people have problems with their digestive system at least once in a while. Did you ever eat something that didn’t “agree” with you? Maybe you had a stomachache or felt sick to your stomach. Perhaps... | B: digestive system. |
White light is a mixture of all wavelengths of what?
Here are the choices:
A. visible light
B. x-rays
C. gamma radiation
D. infrared radiation | A: visible light. | |
What prevents solutes that have accumulated in the xylem from leaking back into the soil solution?
Here are the choices:
A. the exoskeleton
B. the exodermis
C. the endodermis
D. the altostratus | C: the endodermis. | |
Hydrogen chloride contains one atom of hydrogen and one atom of what?
Here are the choices:
A. nitrogen
B. calcium
C. magnesium
D. chlorine | Hydrogen chloride contains one atom of hydrogen and one atom of chlorine. Because the. | D: chlorine. |
What property of toluene and xylene makes them important in the chemical industry?
Here are the choices:
A. solvent property
B. excess property
C. corrosive property
D. isolate property | Toluene and xylene are important solvents and raw materials in the chemical industry. Styrene is used to produce the polymer polystyrene. | A: solvent property. |
The earliest cells were prokaryotes, surrounded by a cell membrane but lacking which key structure?
Here are the choices:
A. ribosomes
B. mitochondria
C. nucleus
D. lysosomes | The first organisms were made of only one cell ( Figure below ). The earliest cells were prokaryotes . Prokaryotic cells are surrounded by a cell membrane. They do not have a nucleus. Their organelles are free in the cell. The cells get their nutrients directly from the water they live in. The cells need to use these n... | C: nucleus. |
When is the rate of the forward reaction equal to the rate of the reverse reaction?
Here are the choices:
A. at equilibrium
B. at conduction
C. before equilibrium
D. after equilibrium | At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. | A: at equilibrium. |
In which process do signaling molecules from embryonic cells cause transcriptional changes in nearby target cells?
Here are the choices:
A. maturation
B. replication
C. orientation
D. induction | D: induction. | |
Every species has a characteristic number of what?
Here are the choices:
A. ribosomes
B. DNA
C. chromosomes
D. receptors | C: chromosomes. | |
Ecologists already use the abilities of many prokaryotes to carry out bioremediation of soils and what else?
Here are the choices:
A. plasma
B. air
C. gas
D. water | D: water. | |
How is most evidence gathered in science?
Here are the choices:
A. hypothesis
B. field research
C. lab experiments
D. observation | Lab experiments are the main method of gathering evidence in some branches of science. Why might lab experiments not be the best way to study living things, such as wild animals?. | C: lab experiments. |
Phosphate groups are found within phospholipids and what else?
Here are the choices:
A. nucleotides
B. hydrocarbon chains
C. carotenoids
D. amino acids | Phosphate groups are found within phospholipids and nucleotides. | A: nucleotides. |
Yogurt is made with milk fermented with what?
Here are the choices:
A. disease
B. pathogens
C. bacteria
D. viruses | Describe hurricane formation and the damage they cause. | C: bacteria. |
What is energy from the sun called?
Here are the choices:
A. thermodynamic energy
B. potential energy
C. kinetic energy
D. solar energy | D: solar energy. | |
What is the term for when gravity pulls soil, mud, and rocks down cliffs and hillsides?
Here are the choices:
A. avalanche
B. mass momentum
C. mass movement
D. mass pressure | Gravity can pull soil, mud, and rocks down cliffs and hillsides. This is called mass movement. The most destructive types of mass movement are landslides and mudslides. They occur suddenly and without warming. They engulf everything in their path. | C: mass movement. |
Metals are good conductors of what?
Here are the choices:
A. light
B. sound
C. electricity
D. metabolism | Metals are elements that are good conductors of electricity. They are the largest of the three classes of elements. In fact, most elements are metals. Look back at the modern periodic table ( Figure above ) in this chapter’s lesson "How Elements Are Organized. " Find the metals in the table. They are all the elements t... | C: electricity. |
What plant hormone allows plants to curve in a specific direction?
Here are the choices:
A. peptides
B. auxin
C. pheremone
D. apoptosis | Plants may not be able to move to another location, but they are able to change how they grow in response to their environment. Growth toward or away from a stimulus is known as a tropism ( Table below ). Auxins, a class of plant hormones, allow plants to curve in specific directions as they grow. The auxin moves to on... | B: auxin. |
What is the most common type of organic compound?
Here are the choices:
A. carbohydrates
B. vitamins
C. proteins
D. fats | Carbohydrates are the most common type of organic compound. A carbohydrate is an organic compound such as sugar or starch, and is used to store energy. Like most organic compounds, carbohydrates are built of small, repeating units that form bonds with each other to make a larger molecule. In the case of carbohydrates, ... | A: carbohydrates. |
Dissolved oxygen in seawater is critical for sea creatures, but as the oceans warm, oxygen becomes less what?
Here are the choices:
A. abundant
B. soluble
C. insoluble
D. saturated | Introduction Coral reefs are home to about 25% of all marine species. They are being threatened by climate change, oceanic acidification, and water pollution, all of which change the composition of the solution we know as seawater. Dissolved oxygen in seawater is critical for sea creatures, but as the oceans warm, oxyg... | B: soluble. |
Light waves differ based on their frequency and what else?
Here are the choices:
A. amplitude
B. density
C. weight
D. voltage | 36.5 Vision Vision is the only photo responsive sense. Visible light travels in waves and is a very small slice of the electromagnetic radiation spectrum. Light waves differ based on their frequency (wavelength = hue) and amplitude (intensity = brightness). In the vertebrate retina, there are two types of light recepto... | A: amplitude. |
What kind of diseases can be difficult to treat because they live inside the host's cells, making it hard to destroy them without killing host cells?
Here are the choices:
A. viral diseases
B. cancerous diseases
C. nucleus diseases
D. superfluous diseases | Viral diseases can be difficult to treat. They live inside the cells of their host, so it is hard to destroy them without killing host cells. Antibiotics also have no effect on viruses. Antiviral drugs are available, but only for a limited number of viruses. | A: viral diseases. |
What type of cellular respiration occurs in the presence of oxygen?
Here are the choices:
A. anaerobic
B. extracellular
C. hyperbaric
D. aerobic | There are two types of cellular respiration (see Cellular Respiration concept): aerobic and anaerobic. 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. | D: aerobic. |
Stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen that take place during what process?
Here are the choices:
A. glycolysis
B. fertilization
C. photosynthesis
D. spermatogenesis | For photosynthesis, stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen. Stomata are flanked by guard cells that swell or shrink by taking in or losing water through osmosis. When they do, they open or close the stomata. | C: photosynthesis. |
If pollination and fertilization occur, a diploid zygote forms within an ovule, located where
Here are the choices:
A. ovary
B. bladder
C. uterus
D. testicle | If pollination and fertilization occur, a diploid zygote forms within an ovule in the ovary. The zygote develops into an embryo inside a seed, which forms from the ovule and also contains food to nourish the embryo. The ovary surrounding the seed may develop into a fruit. Fruits attract animals that may disperse the se... | A: ovary. |
What makes up 99 percent of air?
Here are the choices:
A. dioxide and nitrogen
B. phosphorus and oxygen
C. oxygen and dioxide
D. nitrogen and oxygen | Figure below shows the main gases in air. Nitrogen and oxygen make up 99 percent of air. Argon and carbon dioxide make up much of the rest. These percentages are the same just about everywhere in the atmosphere. | D: nitrogen and oxygen. |
What is the process in which producers get their energy from sources other than the sun?
Here are the choices:
A. electrolysis
B. biosynthesis
C. chemosynthesis
D. phototropism | There are also bacteria that use chemical processes to produce food. They get their energy from sources other than the sun, but they are still called producers. This process is known as chemosynthesis , and is common in ecosystems without sunlight, such as certain marine ecosystems. | C: chemosynthesis. |
Parasitism, mutualism, and commensalism are instances of what type of interaction?
Here are the choices:
A. enzymatic
B. antibiotic
C. symbiotic
D. semantic | C: symbiotic. | |
The cell wall of plants is made up of a complex carbohydrate that is a polymer of what sugar?
Here are the choices:
A. glucose
B. fructose
C. sucrose
D. insulin | complex carbohydrate that is a polymer of glucose and that makes up the cell wall of plants. | A: glucose. |
Which metal is not a solid even at room temperature?
Here are the choices:
A. mercury
B. iron
C. aluminum
D. copper | A metal is an element that is a good conductor of heat and electricity. Metals are also malleable, which means that they can be hammered into very thin sheets without breaking, and ductile, which means that they can be drawn into wires. When a fresh surface of any metal is exposed, it will be very shiny, because it ref... | A: mercury. |
How do molecules react when a gas is heated?
Here are the choices:
A. they move slower
B. they disintegrate
C. they explode
D. they move faster | Gases are compressible, meaning that when put under high pressure, the particles are forced closer to one another. This decreases the amount of empty space and reduces the volume of the gas. Gas volume is also affected by temperature. When a gas is heated, its molecules move faster and the gas expands. Because of the v... | D: they move faster. |
Mountain building and earthquakes are some of the responses of rocks when subected to what?
Here are the choices:
A. time
B. weather
C. stress
D. erosion | When plates are pushed or pulled, the rock is subjected to stress. Stress can cause a rock to change shape or to break. When a rock bends without breaking, it folds. When the rock breaks, it fractures. Mountain building and earthquakes are some of the responses rocks have to stress. | C: stress. |
What is defined as maintaining a stable internal environment?
Here are the choices:
A. homeostasis
B. peristalsis
C. consciousness
D. ketosis | Lenses are made of transparent material such as glass or plastic with an index of refraction greater than that of air. At least one of the faces is a part of a sphere; a convex lens is thicker at the center than the edges, and a concave lens is thicker at the edges than the center. Convex lenses are called converging l... | A: homeostasis. |
What element chemically weathers rock by combining with a metal?
Here are the choices:
A. hydrogen
B. nitrogen
C. carbon
D. oxygen | Oxygen chemically weathers rock by combining with a metal. | D: oxygen. |
Porifera are parazoans that exhibit simple organization and lack true what?
Here are the choices:
A. cell membranes
B. nuclei
C. molecules
D. tissues | 15.2 Sponges and Cnidarians Animals included in phylum Porifera are parazoans and do not possess true tissues. These organisms show a simple organization. Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellula... | D: tissues. |
The values of which factors are controlled by the experimenter over the course of an experiment?
Here are the choices:
A. independent approaches
B. independent variables
C. other variables
D. independent elements | A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). Dependent variables change in response to the independent variable. | B: independent variables. |
What are the most common causes of brain injuries?
Here are the choices:
A. alcohol poisoning
B. excessive shaking
C. falls
D. lightning strikes | Brain injuries can range from mild to extremely severe, but even mild injuries need medical attention. Brain injuries can result from falls, car accidents, violence, sports injuries, and war and combat. Falls are the most common cause of brain injuries, particularly in older adults and young children. | C: falls. |
Electrons are located at fixed distances from the nucleus, what are they called?
Here are the choices:
A. Positive levels
B. energy levels
C. energy concentrations
D. Energy layers | Electrons are located at fixed distances from the nucleus, called energy levels. You can see the first three energy levels in the Figure below . The diagram also shows the maximum possible number of electrons at each energy level. | B: energy levels. |
Which factor has a big impact on coastal climates?
Here are the choices:
A. large ocean currents
B. tsunami
C. tide
D. ocean waves | Large ocean currents can have a big impact on the climate of nearby coasts. The Gulf Stream, for example, carries warm water from near the equator up the eastern coast of North America. Look at the map in Figure below . It shows how the Gulf Stream warms both the water and land along the coast. | A: large ocean currents. |
What occurs when light bends as it passes from one type of matter to another?
Here are the choices:
A. vibration
B. resonance
C. refraction
D. reflection | Light may be refracted by matter. The light is bent when it passes from one type of matter to another. Refraction of light is similar to refraction of sound waves. You can also read more about refraction of light in the lesson “Optics. ”. | C: refraction. |
What is a polymer formed by chain addition reactions between monomers that contain a double bond called?
Here are the choices:
A. a linear polymer
B. a branched polymer
C. an addition monolayer
D. an addition polymer | An addition polymer is a polymer formed by chain addition reactions between monomers that contain a double bond. Molecules of ethene can polymerize with each other under the right conditions to form the polymer called polyethylene. | D: an addition polymer. |
What do you call resources that can be replaced at the rate they are being used?
Here are the choices:
A. innovative
B. viable
C. renewable
D. abundant | Renewable resources can be replaced at the rate they are being used. | C: renewable. |
The type of vesicle transport that moves a substance out of the cell is called?
Here are the choices:
A. morphogenesis
B. metabolism
C. endocytosis
D. exocytosis | Exocytosis is the type of vesicle transport that moves a substance out of the cell. A vesicle containing the substance moves through the cytoplasm to the cell membrane. Then, the vesicle membrane fuses with the cell membrane, and the substance is released outside the cell. You can watch an animation of exocytosis at th... | D: exocytosis. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.