questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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What blood component serves both structural and molecular functions in blood clotting?
Here are the choices:
A. plasma
B. proteins
C. platelets
D. molecules | C: platelets. | |
What type of reproduction begins when an egg and sperm combine?
Here are the choices:
A. natural reproduction
B. sexual reproduction
C. regular reproduction
D. asexual reproduction | 18.1 How Animals Reproduce Reproduction may be asexual when one individual produces genetically identical offspring, or sexual when the genetic material from two individuals is combined to produce genetically diverse offspring. Asexual reproduction in animals occurs through fission, budding, fragmentation, and partheno... | B: sexual reproduction. |
What are long chains of amino acids?
Here are the choices:
A. cells
B. Fatty Acid Chains
C. proteins
D. lipids | The reverse reaction (amide hydrolysis) is very useful in the study of protein structure. Proteins are long chains of amino acids (each amino acid contains an amine group and a carboxyl group, both attached to a central carbon atom). The amino acids are linked together by amide bonds to form the long protein chain. One... | C: proteins. |
What phase exists when all the water in a container has physical properties intermediate between those of the gaseous and liquid states?
Here are the choices:
A. impregnation fluid
B. hydrothermal fluid
C. supercritical fluid
D. stationary fluid | Supercritical Fluids If we place a sample of water in a sealed container at 25 °C, remove the air, and let the vaporization-condensation equilibrium establish itself, we are left with a mixture of liquid water and water vapor at a pressure of 0.03 atm. A distinct boundary between the more dense liquid and the less dens... | C: supercritical fluid. |
What do you call the movement of a substance from an area of a higher amount toward an area of lower amount?
Here are the choices:
A. precipitation
B. filtration
C. diffusion
D. extraction | Diffusion is the movement of a substance from an area of a higher amount toward an area of lower amount. A concentration gradient initially exists across the cell membrane. Equilibrium is reached when there is an equal amount of the substance on both sides of the membrane. | C: diffusion. |
Each myofibril is made up of two types of proteins, called actin and what?
Here are the choices:
A. dynein
B. elongation
C. Fatty Acid
D. myosin | Each myofibril is made up of two types of proteins, called actin and myosin. These proteins form thread-like filaments. | D: myosin. |
If the experimental value is less than the accepted value, the error is what?
Here are the choices:
A. caused
B. positive
C. negative
D. effective | If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive. Often, error is reported as the absolute value of the difference in order to avoid the confusion of a negative error. The percent error is the absolute va... | C: negative. |
According to which process, sublevels and orbitals are filled with electrons in order of increasing energy?
Here are the choices:
A. hausen
B. particle dynamics
C. aufbau
D. Schrodinger's cat | According to the Aufbau process, sublevels and orbitals are filled with electrons in order of increasing energy. Since the s sublevel consists of just one orbital, the second electron simply pairs up with the first electron as in helium. The next element is lithium and necessitates the use of the next available subleve... | C: aufbau. |
The roughness of interacting surfaces and the magnitude of force pushing one object onto another are two factors related to what force?
Here are the choices:
A. tension
B. energy
C. friction
D. temperature | The force of friction between these two blocks is related to two factors. The first factor is the roughness of the surfaces that are interacting, which is called the coefficient of friction , (Greek letter mu). The second factor is the magnitude of the force pushing the top block down onto the lower block. It is reason... | C: friction. |
How many types of leptons are there?
Here are the choices:
A. two
B. six
C. twelve
D. nine | There are also six types of leptons, including electrons. Leptons have an electric charge of either -1 or 0. Electrons, for example, have a charge of -1. Leptons have mass, although the mass of electrons is extremely small. | B: six. |
Plants, algae and bacteria are all examples of what type of organism?
Here are the choices:
A. skeletal
B. unicellular
C. microbes
D. photosynthetic | Photosynthetic organisms include plants, algae, and some bacteria. | D: photosynthetic. |
What forms after air cools below its dew point?
Here are the choices:
A. fog
B. plasma
C. sleet
D. smoke | Advection fog is famous in San Francisco, California. Warm, moist air comes in from the Pacific Ocean. The air blows over the cold California current. When the air cools below its dew point, fog forms. Sea breezes bring the fog onshore. | A: fog. |
In hornworts, the horns are the sporophytes that rise up from what?
Here are the choices:
A. the polyol gametophyte
B. the breaza gametophyte
C. the roots
D. the leaflike gametophyte | Jason Hollinger. In hornworts, the horns are the sporophytes that rise up from the leaflike gametophyte . CC BY 2.0. | D: the leaflike gametophyte. |
What generally sets the direction that technology takes?
Here are the choices:
A. local animals
B. random chance
C. problems of society
D. local weather | The goal of technology is to solve people’s problems. Therefore, the problems of society generally set the direction that technology takes. Technology, in turn, affects society. It may make people’s lives easier or healthier. Two examples are described in Figure below . | C: problems of society. |
Living things that feed on others are generally known as what?
Here are the choices:
A. producers
B. consumers
C. isolators
D. customers | B: consumers. | |
What is an isotope that is radioactive called?
Here are the choices:
A. radioisotopes
B. radionuclides
C. isotopes
D. matured isotope | Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes. An example of a radioisotope is carbon-14. | A: radioisotopes. |
What is a compound that can form ions when it dissolves in water called?
Here are the choices:
A. sulfate
B. compound
C. electrolyte
D. isolate | acid will form a homogeneous solution with water. (In fact, the solubility of both butanol and pentanoic acid in water is quite low, only about 3 g per 100 g water at 25°C. ) 10. An electrolyte is any compound that can form ions when it dissolves in water. When a strong electrolyte dissolves in water, it dissociates co... | C: electrolyte. |
When using a generator, we are transforming what energy into what energy?
Here are the choices:
A. mechanical into thermal
B. magnetic into kinetic
C. thermal into radioactive
D. kinetic into electrical | Generators may be set up to produce either direct or alternating current. Generators in cars and most power plants produce alternating current. Regardless of the type of current, all generators change kinetic energy to electrical energy. | D: kinetic into electrical. |
What kind of resource is soil?
Here are the choices:
A. finite
B. viable
C. nonrenewable
D. renewable | Soil is a renewable resource. Sometimes it is lost faster than it can be replaced. | D: renewable. |
What is the term for the stalk connecting a leaf to a stem?
Here are the choices:
A. cuticle
B. base
C. blades
D. petiole | Figure 30.4 Leaves are attached to the plant stem at areas called nodes. An internode is the stem region between two nodes. The petiole is the stalk connecting the leaf to the stem. The leaves just above the nodes arose from axillary buds. | D: petiole. |
What are the specialized cells within the brain called?
Here are the choices:
A. neurons
B. electrons
C. protons
D. ions | Figure 3.9 (a) A typical human brain weighs about 1.5 kg and occupies a volume of roughly 1.1 L. (b) Information is transmitted in brain tissue and throughout the central nervous system by specialized cells called neurons (micrograph shows cells at 1600× magnification). Specialized cells called neurons transmit informa... | A: neurons. |
What stimulates the production of milk by the mammary glands following childbirth?
Here are the choices:
A. estrogen
B. prolactin
C. melanin
D. progesterone | (PRL) in females. Prolactin stimulates the production of milk by the mammary glands following childbirth. Prolactin levels are regulated by the hypothalamic hormones prolactin-releasing hormone (PRH) and prolactin-inhibiting hormone (PIH) which is now known to be dopamine. PRH stimulates the release of prolactin and PI... | B: prolactin. |
In vascular plants, the sporophyte generation is what?
Here are the choices:
A. resting
B. submissive
C. dominant
D. non-existant | In vascular plants, the sporophyte generation is dominant. | C: dominant. |
What organ system transports blood through the body and to and from the lungs?
Here are the choices:
A. metabolism
B. circulatory
C. nervous
D. digestive | in animals but also in plants. An organ system is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, the circulatory system transports blood through the body and to and from the lungs; it includes organs such as the heart and blood vessels. Organi... | B: circulatory. |
"cardio" has become slang for what type of exercise that raises your heart rate for an extended amount of time?
Here are the choices:
A. cyclical
B. aerobic
C. anaerobic
D. kinetic | "Cardio" has become slang for aerobic exercise that raises your heart rate for an extended amount of time. Cardio can include biking, running, or swimming. Can you guess one of the main organs of the cardiovascular system? Yes, your heart. | B: aerobic. |
How many protons do all atoms of a particular element have in their nuclei?
Here are the choices:
A. zero
B. same number
C. three
D. varying number | B: same number. | |
One of the five fundamental conservation laws in the universe refers to conservation of what, which is the product of mass and velocity?
Here are the choices:
A. fluid
B. momentum
C. energy
D. light | The universe has many remarkable qualities, among them a rather beautiful symmetry: the total amount of motion in the universe balances out … always. This law only makes sense if we measure “motion” in a specific way: as the product of mass and velocity. This product, called momentum , can be exchanged from one object ... | B: momentum. |
Copper oxide is a result of what two substances mixing?
Here are the choices:
A. copper and gas
B. crystal and oxygen
C. metal and oxygen
D. copper and oxygen | D: copper and oxygen. | |
The process of getting oxygen into the body and releasing carbon dioxide is called?
Here are the choices:
A. persperation
B. respiration
C. osmosis
D. precipitation | The process of getting oxygen into the body and releasing carbon dioxide is called respiration . Sometimes breathing is called respiration, but there is much more to respiration than just breathing. Breathing is only the movement of oxygen into the body and carbon dioxide out of the body. The process of respiration als... | B: respiration. |
Someone who believes something despite the evidence is referred to by what term that references a false belief about our planet?
Here are the choices:
A. conspiracy theorist
B. flat-earther
C. solid - earther
D. geocentric-earther | Flat-earther is a term used to describe someone who believes something despite the evidence. Or who does not believe something despite the evidence. There are actually people who believe that Earth is flat. They say that satellite photos are faked. They believe that the Apollo Moon landings were faked. But there are ve... | B: flat-earther. |
Which cells continue the digestion and absorption of nutrients and transport these nutrients to the lymphatic and circulatory systems?
Here are the choices:
A. myocyte
B. blood cells
C. neurons
D. epithelial cells | Watch this animation (http://openstaxcollege. org/l/sintestine) that depicts the structure of the small intestine, and, in particular, the villi. Epithelial cells continue the digestion and absorption of nutrients and transport these nutrients to the lymphatic and circulatory systems. In the small intestine, the produc... | D: epithelial cells. |
Pressure is defined as the force per unit area on?
Here are the choices:
A. surface
B. weight
C. gravity
D. speed | Pressure is defined as the force per unit area on a surface. | A: surface. |
What do body cells use for energy?
Here are the choices:
A. solvents
B. sugars
C. mixtures
D. chlorophyll | A: You may eat a wide variety of carbohydrates—from sugars in fruits to starches in potatoes. However, body cells use only sugars for energy. | B: sugars. |
What force pulls people and objects toward the center of the earth?
Here are the choices:
A. gravity
B. magnetism
C. variation
D. motion | You are already very familiar with Earth’s gravity. It constantly pulls you toward the center of the planet. It prevents you and everything else on Earth from being flung out into space as the planet spins on its axis. It also pulls objects above the surface, from meteors to skydivers, down to the ground. Gravity betwe... | A: gravity. |
The rate of decay of carbon-14 does what over time?
Here are the choices:
A. becomes unstable
B. remains stable
C. increases
D. decreases | The rate of decay of carbon-14 is stable over time. | B: remains stable. |
What behavior includes all the ways that animals interact with each other and the environment?
Here are the choices:
A. adaptation
B. interdependence
C. animal behavior
D. instinct | Did you ever see a dog sit on command? Have you ever watched a cat trying to catch a mouse? These are just two examples of the many behaviors of animals. Animal behavior includes all the ways that animals interact with each other and the environment. Examples of common animal behaviors are pictured in Figure below . | C: animal behavior. |
Food chains carry energy from what group to what group?
Here are the choices:
A. refiners to consumers
B. producers to consumers
C. decomposers to producers
D. consumers to producers | Food chains carry energy from producers (autotrophs) to consumers (heterotrophs). 99% of energy for life comes from the sun via photosynthesis. Note that only nutrients recycle. Energy must continue to flow into the system. Though this food chains "ends" with decomposers, do decomposers, in fact, digest matter from eac... | B: producers to consumers. |
What are professionals in technology are generally called ?
Here are the choices:
A. engineers
B. doctors
C. scientists
D. biomechanics | Companies that design and build roller coasters employ a range of technology professionals. Technology is the application of science to real-world problems. Professionals in technology are generally called engineers . Engineers are creative problem solvers. They use math and science to design and develop just about eve... | A: engineers. |
What force occurs whenever two surfaces come into contact?
Here are the choices:
A. tension
B. vibration
C. friction
D. gravity | Even if Laura didn’t try to stop the skateboard, it would stop sooner or later. That’s because there’s also friction between the wheels and the pavement. Friction is a force that counters all kinds of motion. It occurs whenever two surfaces come into contact. | C: friction. |
The anatomy of primate eyes shows they tend to rely more on vision than what sense, which is dominant in many other mammals?
Here are the choices:
A. touch
B. hearing
C. taste
D. smell | Primates usually rely more on the sense of vision rather than the sense of smell, which is the dominant sense in many other mammals. The importance of vision in primates is reflected by the bony socket that surrounds and protects the primate eye. Primates have widely spaced eyes in the same plane that give them stereos... | D: smell. |
What are sensory cells?
Here are the choices:
A. specialized neurons or navigable cells
B. specialized epithelial or squirm cells
C. specialized neurons or epithelial cells
D. specialized neurons or squirm cells | C: specialized neurons or epithelial cells. | |
What is it called when waves interact with other waves?
Here are the choices:
A. wave collision
B. wave impact
C. wave interference
D. combination interference | Waves interact not only with matter in the ways described above. Waves also interact with other waves. This is called wave interference . Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude. How amplitude is a... | C: wave interference. |
What is the ph level for pure water?
Here are the choices:
A. ph of 7
B. pH of 0
C. ph of 3.17
D. ph of 6.47 | The extremely low hydronium ion concentration of pure water gives pure water a neutral pH of 7. Acids have a pH lower than 7, and bases have a pH higher than 7. | A: ph of 7. |
What is vital for nervous system functions that include muscle stimulation, memory formation, and learning?
Here are the choices:
A. acetylcholine
B. glutamate
C. glycogen
D. thiamine | A: acetylcholine. | |
The benthic zone is found at the bottom of all of what type of biomes?
Here are the choices:
A. desert
B. well
C. aquatic
D. space | C: aquatic. | |
The hydroxyl radical is highly reactive because it has what?
Here are the choices:
A. paired electron
B. unpaired neutron
C. unpaired electron
D. paired proton | Because the hydroxyl radical has an unpaired electron, it is highly reactive. (This is true of any substance with unpaired electrons, known as a free radical. ) This hydroxyl radical can react with all kinds of biological molecules (DNA, proteins, enzymes, and so on), causing damage to the molecules and disrupting phys... | C: unpaired electron. |
Gametes swim with the aid of what structure to the female gametangium, and fertilization ensues?
Here are the choices:
A. acrosome
B. nucleus
C. oocyte
D. flagella | gametes swim with the aid of their flagella to the female gametangium (the archegonium), and fertilization ensues. The zygote grows into a small sporophyte still attached to the parent gametophyte. It will give rise, by meiosis, to the next generation of spores. Liverwort plants can also reproduce asexually, by the bre... | D: flagella. |
A phospholipid is a bond between the glycerol component of a lipid and what else?
Here are the choices:
A. phosphorous molecule
B. elemental molecule
C. chlorine molecule
D. oxygen molecule | Phospholipids As its name suggests, a phospholipid is a bond between the glycerol component of a lipid and a phosphorous molecule. In fact, phospholipids are similar in structure to triglycerides. However, instead of having three fatty acids, a phospholipid is generated from a diglyceride, a glycerol with just two fatt... | A: phosphorous molecule. |
What connects the fetus to the placenta?
Here are the choices:
A. womb
B. fallopian tube
C. umbilical cord
D. amniotic sac | The placenta allows nutrients and wastes to be exchanged between the mother and fetus. The fetus is connected to the placenta through the umbilical cord. | C: umbilical cord. |
In desert cactus, thorns that protect the water held in a large, barrel-shaped stem are an example of what?
Here are the choices:
A. species
B. characteristic
C. feature
D. adaptation | The saguaro cactus pictured in Figure below has adapted in all three ways. When it was still a very small plant, just a few inches high, its shallow roots already reached out as much as 2 meters (7 feet) from the base of the stem. By now, its root system is much more widespread. It allows the cactus to gather as much m... | D: adaptation. |
What are the most common dietary lipids?
Here are the choices:
A. triglycerides
B. monoglycerides
C. phospholipids
D. diglycerides | Lipid Digestion A healthy diet limits lipid intake to 35 percent of total calorie intake. The most common dietary lipids are triglycerides, which are made up of a glycerol molecule bound to three fatty acid chains. Small amounts of dietary cholesterol and phospholipids are also consumed. The three lipases responsible f... | A: triglycerides. |
What process is the opposite of fusion and releases energy only when heavy nuclei are split?
Here are the choices:
A. osmosis
B. fission
C. activation
D. diffusion | Fission is the opposite of fusion and releases energy only when heavy nuclei are split. As noted in Fusion, energy is released if the products of a nuclear reaction have a greater binding energy per nucleon ( BE / A ) than the parent nuclei. Figure 32.25. | B: fission. |
Visible light is the narrow segment of what, to which the normal human eye responds?
Here are the choices:
A. molecular spectrum
B. radio spectrum
C. electromagnetic spectrum
D. phenomena spectrum | Visible Light Visible light is the narrow segment of the electromagnetic spectrum to which the normal human eye responds. Visible light is produced by vibrations and rotations of atoms and molecules, as well as by electronic transitions within atoms and molecules. The receivers or detectors of light largely utilize ele... | C: electromagnetic spectrum. |
Bromine is much less abundant than fluorine or chlorine, but it is easily recovered from seawater, which contains about 65 mg of br− per what?
Here are the choices:
A. liter
B. pound
C. foot
D. gallon | electrolysis2NaOH ( aq ) + Cl2 ( g ) + H 2 ( g ) Bromine is much less abundant than fluorine or chlorine, but it is easily recovered from seawater, which contains about 65 mg of Br− per liter. Salt lakes and underground brines are even richer sources; for example, the Dead Sea contains 4 g of Br− per liter. Iodine is t... | A: liter. |
Karyotyping shows whether what structures, which contain genetic information, are normal in number and appearance?
Here are the choices:
A. neutrons
B. nucleoids
C. ribosomes
D. chromosomes | D: chromosomes. | |
Real gases deviate from ideal form at high pressure and what other thermodynamic condition?
Here are the choices:
A. low pressure
B. high temperatures
C. low temperatures
D. high winds | Real gases deviate from ideal gases at high pressures and at low temperatures. | C: low temperatures. |
Organic substances, including proteins, carbohydrates, and oils, contain what element?
Here are the choices:
A. acid
B. carbon
C. iron
D. oxygen | A mineral is an inorganic substance. It was not made by living organisms. Organic substances contain carbon. Some types of organic substances are proteins, carbohydrates, and oils. Everything else is inorganic. In a few cases, living organisms make inorganic materials. The calcium carbonate shells made by marine animal... | B: carbon. |
What term describes anything that occupies space and has mass, and is generally divided into three states?
Here are the choices:
A. matter
B. galaxy
C. stuff
D. lquid | Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. A physical change involves the conversion of a substance from one state of matter to another, without changing its chemical composition. Most matter consists of mixtures of pure substances, which can behomogeneou... | A: matter. |
When light strikes the rods and cones, they hyperpolarize, shutting off their release of what?
Here are the choices:
A. vitreous fluid
B. enzyme
C. glutamate
D. dopamine | C: glutamate. | |
The heart contracts rhythmically to pump what to the lungs and the rest of the body?
Here are the choices:
A. Bile
B. Cerumen
C. blood
D. Chyle | The heart contracts rhythmically to pump blood to the lungs and the rest of the body. Specialized cardiac muscle cells trigger the contractions. | C: blood. |
What do light emitters do to what you see?
Here are the choices:
A. subtract frequencies
B. divide frequencies
C. add frequencies
D. block frequencies | Discussions of colors can sometimes become confusing because of the difference between light emitters and light absorbers. Light absorbers, such as dyes and pigments, absorb frequencies from those that you see, while light emitters add frequencies to what you see. If I were to shine red light, green light, and blue lig... | C: add frequencies. |
A turbine using tides in the ocean can create what type of energy?
Here are the choices:
A. diffused
B. electricity
C. conversion
D. kinetic | Tides in the ocean can also turn a turbine to create electricity. This energy can then be stored until needed ( Figure below ). | B: electricity. |
The atomic number is the same as the number of what in an atom?
Here are the choices:
A. electrons
B. ions
C. protons
D. neutrons | The number of protons in an atom is called its atomic number. This is also unique for each element. | C: protons. |
What is the closed circulatory system of humans and other vertebrates called?
Here are the choices:
A. cardiovascular system
B. respiratory system
C. digestive system
D. reproductive system | A: cardiovascular system. | |
"red-shift" refers to a shift toward red in the spectrum from what celestial bodies?
Here are the choices:
A. galaxies
B. stars
C. comets
D. planets | The spectrum from stars is shifted toward the red; this is known as red-shift. Red-shift of galaxies is evidence that the Universe is expanding. | B: stars. |
What is the name for substances with a ph above 7?
Here are the choices:
A. protein
B. bases
C. nutrient
D. acid | Bases have a lower concentration of hydronium ions than pure water, and a pH higher than 7. | B: bases. |
The subducting oceanic plate does what as it reenters the mantle?
Here are the choices:
A. melts
B. evaporates
C. disappers
D. freezes | As you would expect, where plates collide there are lots of intense earthquakes and volcanic eruptions. The subducting oceanic plate melts as it reenters the mantle. The magma rises and erupts. This creates a volcanic mountain range near the coast of the continent. This range is called a continental arc . The Andes Mou... | A: melts. |
Which stage of development is a period during which apoptosis is widespread and plays a crucial role?
Here are the choices:
A. infancy
B. puberty
C. embryonic
D. transgenic | C: embryonic. | |
What orifice in the body is particularly helpful in both digestion and respiration?
Here are the choices:
A. anus
B. nostril
C. nose
D. mouth | D: mouth. | |
What subphylum, which includes crabs and crayfish, represents the dominant aquatic arthropods?
Here are the choices:
A. sponges
B. crustaceans
C. invertebrates
D. arachnids | Crustaceans, such as shrimp, lobsters, crabs, and crayfish, are the dominant aquatic arthropods. A few crustaceans are [3] terrestrial species like the pill bugs or sow bugs. The number of described crustacean species stands at about 47,000. Although the basic body plan in crustaceans is similar to the Hexapoda—head, t... | B: crustaceans. |
What do neurons pass to the next neuron?
Here are the choices:
A. contaminants
B. receptors
C. blood
D. neurotransmitters | Did you ever watch a relay race? After the first runner races, he or she passes the baton to the next runner, who takes over. Neurons are a little like relay runners. Instead of a baton, they pass neurotransmitters to the next neuron. Examples of neurotransmitters are chemicals such as serotonin, dopamine, and adrenali... | D: neurotransmitters. |
What determines which type of precipitation falls in the atmosphere?
Here are the choices:
A. air density
B. air temperature
C. moon phase
D. time of day | Why does it snow instead of rain? Air temperature determines which type of precipitation falls. Rain falls if the air temperature is above freezing (0° C or 32° F). Frozen precipitation falls if the air or ground is below freezing. Frozen precipitation may fall as snow , sleet , or freezing rain . Below, you can see ho... | B: air temperature. |
The main functions of what complex carbohydrates are to store energy and form structural tissues?
Here are the choices:
A. polysaccharides
B. polypeptides
C. oligosaccharides
D. monosaccharides | The main functions of polysaccharides are to store energy and form structural tissues. Examples of several other polysaccharides and their roles are listed in the Table below . These complex carbohydrates play important roles in living organisms. | A: polysaccharides. |
High consumption of saturated fats is linked to an increased risk of what disease?
Here are the choices:
A. cardiovascular disease
B. pulmonary edema
C. diabetes
D. high blood pressure | Unsaturated fat is generally considered to be healthier because it contains fewer calories than an equivalent amount of saturated fat. Additionally, high consumption of saturated fats is linked to an increased risk of cardiovascular disease. Some examples of foods with high concentrations of saturated fats include butt... | A: cardiovascular disease. |
What does hair get its color from?
Here are the choices:
A. fluorescent pigments
B. stimulating pigments
C. melanin pigments
D. elasticity pigments | 5.2 Accessory Structures of the Skin Accessory structures of the skin include hair, nails, sweat glands, and sebaceous glands. Hair is made of dead keratinized cells, and gets its color from melanin pigments. Nails, also made of dead keratinized cells, protect the extremities of our. | C: melanin pigments. |
What type of animal in the sea spend most of their lives as medusae?
Here are the choices:
A. fish
B. sharks
C. jellyfish
D. whales | Jellyfish spend most of their lives as medusae. They live virtually everywhere in the ocean. They prey on zooplankton, other invertebrates, and the eggs and larvae of fish. | C: jellyfish. |
Desert plants have evolved processes to conserve water and deal with harsh conditions. a more efficient use of co2 allows plants to adapt to living with what?
Here are the choices:
A. less competition
B. less water
C. more water
D. more sunlight | perpendicular to the surface at the point where the ray strikes the surface. | B: less water. |
Plants, cyanobacteria, and algae are living things that undergo what process and produce glucose?
Here are the choices:
A. photosynthesis
B. cytoplasmic transfer
C. cellular respiration
D. glycolysis | Living things that undergo photosynthesis and produce glucose include plants, cyanobacteria, and algae. | A: photosynthesis. |
All chemical changes involve a transfer of what?
Here are the choices:
A. fuel
B. heating
C. energy
D. Water | All chemical changes involve a transfer of energy. When zinc reacts with hydrochloric acid, the test tube becomes very warm as energy is released during the reaction. Some other reactions absorb energy. While energy changes are a potential sign of a chemical reaction, care must be taken to ensure that a chemical reacti... | C: energy. |
What is the unique larval form of mollusks called?
Here are the choices:
A. hydra
B. microfilariae
C. scallop
D. trochophore | Mollusks reproduce sexually. Most species have separate male and female sexes. Gametes are released into the mantle cavity. Fertilization may be internal or external, depending on the species. Fertilized eggs develop into larvae. There may be one or more larval stages. Each one is different from the adult stage. Mollus... | D: trochophore. |
A voltage source and a conductor are common to all what?
Here are the choices:
A. thermometers
B. cooling circuits
C. electric circuits
D. magnets | All electric circuits have at least two parts: a voltage source and a conductor. They may have other parts as well, such as light bulbs and switches, as in the simple circuit seen in the Figure below . To see an animation of a circuit like this one, go to: http://www. rkm. com. au/animations/animation-electrical-circui... | C: electric circuits. |
Root systems are mainly of two types. dicots have a tap root system, while monocots have a what?
Here are the choices:
A. fibrous root system
B. attaching root system
C. runner root system
D. long root system | Types of Root Systems Root systems are mainly of two types (Figure 30.15). Dicots have a tap root system, while monocots have a fibrous root system. A tap root system has a main root that grows down vertically, and from which many smaller lateral roots arise. Dandelions are a good example; their tap roots usually break... | A: fibrous root system. |
Enzymes in cellular reactions work to do what to the reaction?
Here are the choices:
A. speed it up
B. slow it down
C. increase yield
D. decrease heat | Enzymes are extremely efficient in speeding up reactions. They can catalyze up to several million reactions per second. As a result, the difference in rates of biochemical reactions with and without enzymes may be enormous. A typical biochemical reaction might take hours or even days to occur under normal cellular cond... | A: speed it up. |
Bony fish can live in either of what type of aquatic biome?
Here are the choices:
A. saltwater or freshwater
B. estuaries or saltwater
C. oceans or estuaries
D. coral reefs or freshwater | Bony fish may live in salt water or freshwater. They consume a wide range of foods. For example, they may eat algae, smaller fish, detritus, or dead organisms, depending on the species of fish. | A: saltwater or freshwater. |
What is categorized by the forces holding the individual atoms, ions, or molecules together?
Here are the choices:
A. solids
B. oils
C. liquids
D. gases | Solids can be categorized by the forces holding the individual atoms, ions, or molecules together. The Table below summarizes the properties of different solids:. | A: solids. |
What are the two main types of air pollutants?
Here are the choices:
A. a and b
B. primary and secondary
C. good and bad
D. new and old | There are two main types of air pollutants: primary and secondary. Most air pollutants come from burning fossil fuels. Some come from burning forests. Some are due to the evaporation of chemicals. | B: primary and secondary. |
The job of the nucleolus is to build what?
Here are the choices:
A. ribosomes
B. cells
C. electrons
D. chromosomes | The nucleus of many cells also contains a central region called the nucleolus . The job of the nucleolus is to build ribosomes. These ribosomes flow out the nuclear pores into the cytoplasm. Ribosomes are organelles that make proteins in the cytoplasm. See the composition of the nucleus pictured below ( Figure below ). | A: ribosomes. |
For many decades, scientists have known that atoms consist of electrons and other particles called protons and?
Here are the choices:
A. nanoparticles
B. rods
C. neutrons
D. waves | For many decades, scientists have known that atoms consist of electrons and other particles called protons and neutrons. Recently they found that there are even smaller particles in atoms. Scientists call these extremely tiny particles by the funny name of quarks. As you can see in this diagram, there are several diffe... | C: neutrons. |
Patients with familial hypercholesterolemia have life-threatening levels of cholesterol because their cells cannot clear what particles from their blood?
Here are the choices:
A. high - density lipoprotein (hdl)
B. iron (Fe)
C. oxygen (O)
D. low-density lipoprotein (ldl) | In receptor-mediated endocytosis, as in phagocytosis, clathrin is attached to the cytoplasmic side of the plasma membrane. If uptake of a compound is dependent on receptor-mediated endocytosis and the process is ineffective, the material will not be removed from the tissue fluids or blood. Instead, it will stay in thos... | D: low-density lipoprotein (ldl). |
What action, performed multiple times daily, is the single biggest use of water in the home?
Here are the choices:
A. taking showers
B. flushing the toilet
C. watering plants
D. washing clothes | It’s easy to save water at home. If you save even a few gallons a day you can make a big difference over the long run. The best place to start saving water is in the bathroom. Toilet flushing is the single biggest use of water in the home. Showers and baths are the next biggest use. Follow the tips below to save water ... | B: flushing the toilet. |
What is a form of mechanical energy that starts with a vibration in matter?
Here are the choices:
A. solar energy
B. industrial energy
C. sound energy
D. electrical energy | 6. Sound energy is a form of mechanical energy that starts with a vibration in matter. For example, the singer’s voice starts with vibrations of his vocal cords, which are folds of tissue in his throat. The vibrations pass to surrounding particles of matter and then from one particle to another in waves. Sound waves ca... | C: sound energy. |
What's caused by damaged capillaries in the kidneys so the nephrons can no longer filter blood?
Here are the choices:
A. colon failure
B. kidney failure
C. bacteria failure
D. sponge failure | Untreated diabetes may damage capillaries in the kidneys so the nephrons can no longer filter blood. This is called kidney failure. The only cure for kidney failure is to receive a healthy transplanted kidney from a donor. Until that happens, a patient with kidney failure can be kept alive by artificially filtering the... | B: kidney failure. |
What do roots bring in from the soil into the plant?
Here are the choices:
A. pesticides and chlorophyll
B. water and nutrients
C. dirt and minerals
D. hormones and fertilizer | B: water and nutrients. | |
In addition to spiral cleavage, protostomes also undergo which other form of cleavage?
Here are the choices:
A. dispersive
B. diagonal
C. determinate
D. straight | There is a second distinction between the types of cleavage in protostomes and deuterostomes. In addition to spiral cleavage, protostomes also undergo determinate cleavage. This means that even at this early stage, the developmental fate of each embryonic cell is already determined. A cell does not have the ability to ... | C: determinate. |
What term is used to describe animals with three germ layers?
Here are the choices:
A. triplegerm
B. triploblasts
C. multilayer
D. sporozoans | Watch this video (http://openstaxcollege. org/l/symmetry2) to see a quick sketch of the different types of body symmetry. Layers of Tissues Most animal species undergo a layering of early tissues during embryonic development. These layers are called germ layers. Each layer develops into a specific set of tissues and or... | B: triploblasts. |
Due to similar function, the wings of bats and birds are referred to as what type of structures?
Here are the choices:
A. matching structures
B. analogous structures
C. Identical structures
D. symmetrical structures | John Romanes, modified by CK-12 Foundation. Wings of bats and birds are analogous structures . Public Domain. | B: analogous structures. |
If the amount of force of that is applied is increased, what happens to the work that a machine is producing?
Here are the choices:
A. it is easier
B. it's unchanged
C. it is harder
D. it's variable | Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. Contrary to popular belief, machines do not increase the amount of work that is done. They just change how the work is done. So i... | A: it is easier. |
What is the name for speed with a direction?
Here are the choices:
A. velocity
B. acceleration
C. distance
D. trajectory | Speed represents how quickly an object is moving through space. Velocity is speed with a direction, making it a vector quantity. If an object’s velocity changes with time, the object is said to be accelerating. As we’ll see in the next chapters, understanding the acceleration of an object is the key to understanding it... | A: velocity. |
How many types of mechanical waves are there?
Here are the choices:
A. nine
B. one
C. five
D. three | There are three types of mechanical waves. They differ in how they travel through a medium. The three types are transverse, longitudinal, and surface waves. All three types are described in detail below. | D: three. |
What is required for a decay chain to end?
Here are the choices:
A. unstable end-product
B. stable end-product
C. radioactive cascade
D. stable half-life | We have talked about the activity and decay of individual isotopes. In the real world, there is a decay chain that takes place until a stable end-product is produced. For U-238, the chain is a long one, with a mix of isotopes having very different half-lives. The end of the chain resides in lead, a stable element that ... | B: stable end-product. |
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