questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
Budding is a form of what type of reproduction in tunicates?
Here are the choices:
A. nuclear
B. asexual
C. sexual
D. microscopic | As larvae, tunicates can swim freely to find food. As adults, tunicates lack a post-anal tail and notochord, and they can no longer swim. Instead, they remain in one place and are filter feeders. Tunicates can reproduce both sexually and asexually. The same adults produce sperm and eggs. However, fertilization always i... | B: asexual. |
Ocean water releases dissolved carbon dioxide into the atmosphere when what happens to the temperature?
Here are the choices:
A. Drops
B. it rises
C. Later
D. Goes Down | Ocean water releases dissolved carbon dioxide into the atmosphere when water temperature rises. | B: it rises. |
The physical sciences can be divided into physics and what other science?
Here are the choices:
A. phsycology
B. chemistry
C. astrology
D. biology | Physical science, in turn, can be divided into chemistry and physics. Chemistry is the study of matter and energy at the scale of atoms and molecules. For example, the synthetic fibers in the swimmer’s suit were created in labs by chemists. Physics is the study of matter and energy at all scales—from the tiniest partic... | B: chemistry. |
What do you call trees that lose their leaves in the fall and grow new ones in the spring?
Here are the choices:
A. coniferous
B. fibrous
C. deciduous
D. perennial | Humid continental climates are found between 40° and 60° north latitude. The northeastern U. S. has this type of climate. Summers are warm to hot, and winters are cold. Precipitation is moderate, and it falls year round. Deciduous trees grow in this climate ( Figure below ). They lose their leaves in the fall and grow ... | C: deciduous. |
In which organ of the body does gluconeogenesis primarily take place?
Here are the choices:
A. kidney
B. heart
C. spleen
D. liver | Gluconeogenesis Gluconeogenesis is the synthesis of new glucose molecules from pyruvate, lactate, glycerol, or the amino acids alanine or glutamine. This process takes place primarily in the liver during periods of low glucose, that is, under conditions of fasting, starvation, and low carbohydrate diets. So, the questi... | D: liver. |
What kind of structure contains the largest known single cell?
Here are the choices:
A. egg
B. Ovaries
C. sperm
D. proteins | The cells you have learned about so far are much smaller than the period at the end of this sentence, so they are normally measured on a very small scale. The smallest prokaryotic cell currently known has a diameter of only 400 nm. Eukaryotic cells normally range between 1– 100µm in diameter. The mouse cells in Figure ... | A: egg. |
While enzymatic hydrolysis proceeds, peristalsis moves the mixture of chyme and digestive juices along what?
Here are the choices:
A. large intestine
B. esophagus
C. stomach
D. small intestine | D: small intestine. | |
What is the most common type of muscle in the human body?
Here are the choices:
A. digestive
B. skeletal
C. fetal
D. internal | Muscle tissue that is attached to bone is skeletal muscle . Whether you are blinking your eyes or running a marathon, you are using skeletal muscle. Contractions of skeletal muscle are voluntary, or under conscious control. When skeletal muscle contracts, bones move. Skeletal muscle is the most common type of muscle in... | B: skeletal. |
The last two stages of aerobic respiration require what?
Here are the choices:
A. water
B. carbon
C. oxygen
D. sulfur | The last two stages of aerobic respiration require oxygen. However, not all organisms live in places where there is a plentiful supply of oxygen. | C: oxygen. |
The rate of dissolving is influenced by surface area, stirring, and what else?
Here are the choices:
A. oxygen
B. temperature
C. density
D. gravity | The rate of dissolving is influenced by surface area, stirring, and temperature. | B: temperature. |
What disease unique to humans and is caused by two variola viruses?
Here are the choices:
A. ebola
B. smallpox
C. diabetes
D. AIDS | A worldwide vaccination campaign by the World Health Organization led to the eradication of smallpox in 1979. Smallpox is a contagious disease unique to humans and is caused by two Variola viruses. The eradication of smallpox was possible because humans are the only carriers of the virus. To this day, smallpox is the o... | B: smallpox. |
What is the average kinetic energy of particles of matter?
Here are the choices:
A. temperature
B. magnetism
C. momentum
D. friction | Temperature is the average kinetic energy of particles of matter. | A: temperature. |
How can you prevent your ice cream from getting a sandy texture?
Here are the choices:
A. by using fructose
B. by using lowfat milk
C. by adding salt
D. by adding oil | Fructose, a sugar found in fruit, contains only carbon, oxygen, and hydrogen. It is used in ice cream to prevent a sandy texture. Complete combustion of 32.4 mg of fructose in oxygen produced 47.6 mg of CO2 and 19.4 mg of H2O. What is the empirical formula of fructose? 11. Coniine, the primary toxin in hemlock, contain... | A: by using fructose. |
Plants can lose their leaves, flower, or break dormancy in response to a change in what?
Here are the choices:
A. averages
B. seasons
C. events
D. periods | Plants can respond to the change of season by losing their leaves, flowering, or breaking dormancy. | B: seasons. |
What is the second highest mountain in the world, at over 28,000 feet?
Here are the choices:
A. pikes peak
B. k2
C. everest
D. makalu | The Karakoram Range is part of the Himalaya Mountains. K2, pictured here, is the second highest mountain the world at over 28,000 feet. The number and height of mountains is impressive. | B: k2. |
What are the two classifications of natural resources?
Here are the choices:
A. recyclable and reversible
B. productive and nonrenewable
C. renewable and nonrenewable
D. renewable and reusable | From the human point of view, natural resources can be classified as renewable or nonrenewable. | C: renewable and nonrenewable. |
Maintaining a high metabolic rate takes a lot of what?
Here are the choices:
A. hydrogen
B. energy
C. power
D. fuel | Maintaining a high metabolic rate takes a lot of energy. The energy must come from food. Therefore, mammals need a nutritious and plentiful diet. The diets of mammals are diverse. Except for leaf litter and wood, almost any kind of organic matter may be eaten by mammals. Some mammals are strictly herbivores or strictly... | B: energy. |
What is the photosynthesis factory of the plant?
Here are the choices:
A. pistil
B. stamen
C. genome
D. chloroplast | The chloroplast is the photosynthesis factory of the plant. | D: chloroplast. |
The process that a plant increases in size is known as what?
Here are the choices:
A. fertilization
B. growth
C. harvest
D. trend | B: growth. | |
What are reversible physical changes in matter called?
Here are the choices:
A. transformations
B. chemical change
C. alterations
D. changes of state | Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again. | D: changes of state. |
Compounds that form from two or more nonmetallic elements are called what?
Here are the choices:
A. hydrogen bonds
B. ionic bonds
C. valent bonds
D. covalent bonds | Compounds that form from two or more nonmetallic elements, such as carbon and hydrogen, are called covalent compounds . In a covalent compound, atoms of the different elements are held together in molecules by covalent bonds. These are chemical bonds in which atoms share valence electrons. The force of attraction betwe... | D: covalent bonds. |
The ability to maintain a stable internal temperature, despite the climate, is exhibited by members of what animal group?
Here are the choices:
A. reptiles
B. mammals
C. fish
D. parasites | Not really. Like all mammals, polar bears maintain a stable internal temperature. They do not need to stay warm by lying in the sun. This allows them to live in cold climates. | B: mammals. |
What are substances that provide hydrogen ions (h+) and lower ph?
Here are the choices:
A. nutrients
B. acids
C. proteins
D. bases | Acids are substances that provide hydrogen ions (H+) and lower pH, whereas bases provide hydroxide ions (OH–) and raise pH. The stronger the acid, the more readily it donates H+. For example, hydrochloric acid and lemon juice are very acidic and readily give up H+ when added to water. Conversely, bases are those substa... | B: acids. |
What are mercury manometers often used to measure?
Here are the choices:
A. blood pressure
B. weight
C. brain waves
D. balance | Mercury manometers are often used to measure arterial blood pressure. An inflatable cuff is placed on the upper arm as shown in Figure 11.17. By squeezing the bulb, the person making the measurement exerts pressure, which is transmitted undiminished. | A: blood pressure. |
What did rockets help launch into space during their beginning?
Here are the choices:
A. rovers
B. satellites
C. shuttles
D. sensors | One of the first uses of rockets in space was to launch satellites. A satellite is an object that orbits a larger object. An orbit is a circular or elliptical path around an object. Natural objects in orbit are called natural satellites. The Moon is a natural satellite. Human-made objects in orbit are called artificial... | B: satellites. |
What sound can be heard when sound waves bounce back from a hard object?
Here are the choices:
A. boom
B. echo
C. eerie
D. loop | Did you ever hear an echo of your own voice? An echo occurs when sound waves bounce back from a hard object. The man in Figure below is trying to create an echo by shouting toward a rock wall. When the sound waves strike the rock wall, they can’t pass through. Instead, they bounce back toward the man, and he hears an e... | B: echo. |
Robert merrifield developed the first synthetic approach for making what essential cell substances in the lab?
Here are the choices:
A. acids
B. proteins
C. cells
D. lipids | Cells in our bodies have an intricate mechanism for the manufacture of proteins. Humans have to use other techniques in order to synthesize the same proteins in a lab. The chemistry of peptide synthesis is complicated. Both active groups on an amino acid can react and the amino acid sequence must be a specific one in o... | B: proteins. |
Strangeness, charm, bottomness, and topness are properties of what subatomic particle?
Here are the choices:
A. dark matter
B. quarks
C. pion
D. molecules | ± symbols are the values for antiquarks. B is baryon number, S is strangeness, c is charm, b is bottomness, t is topness. Values are approximate, are not directly observable, and vary with model. | B: quarks. |
What needs to happen to temperature to cause pressure to increase dramatically?
Here are the choices:
A. small increase
B. boiling point
C. large increase
D. no increase | The pressure increases dramatically due to large increase in temperature. | C: large increase. |
Australopithecus afarensis is an ancestor of what primate?
Here are the choices:
A. orangutans
B. humans
C. gorillas
D. lemurs | Australopithecus afarensis is a human ancestor that lived about 3 million years ago. | B: humans. |
Organs that produce eggs and secrete estrogen are part of what system?
Here are the choices:
A. male reproductive system
B. digestive system
C. female reproductive system
D. circulatory system | one of two female reproductive organs that produces eggs and secretes estrogen. | C: female reproductive system. |
What are the most common types of compounds found on earth?
Here are the choices:
A. hydrogen-based compounds
B. sodium - based compounds
C. carbon-based compounds
D. ionic compounds | Cellulose is a compound found in plants. The chief component of cellulose is carbon. Cellulose is one of many carbon-based compounds that make up living things. In fact, carbon-based compounds are the most common type of compound on Earth. More than 90 percent of all known compounds contain carbon. Do you know why carb... | C: carbon-based compounds. |
Which planet is closest to the sun?
Here are the choices:
A. mercury
B. Jupiter
C. Venus
D. Earth | The four planets closest to the Sun - Mercury, Venus, Earth, and Mars - are the inner planets . They are similar to Earth. All are solid, dense, and rocky. None of the inner planets has rings. Compared to the outer planets, the inner planets are small. They have shorter orbits around the Sun and they spin more slowly. ... | A: mercury. |
What do you call it when adult fish of the same species come together in a group and release gametes into the water at the same time?
Here are the choices:
A. migration
B. schoaling
C. poaching
D. spawning | Nearly all fish reproduce sexually and have separate sexes. Fertilization is generally external, and most fish are oviparous. Many adults of the same species may come together in a group and release gametes into the water at the same time, which is called spawning. Fish hatch into larvae that are different from the adu... | D: spawning. |
What happens to the volume of a gas as the kelvin temperature increases?
Here are the choices:
A. it increases
B. it drops
C. it decreases
D. it continues | The volume of a gas increases as the Kelvin temperature increases. | A: it increases. |
If only one atom of a specific type is present what is not used?
Here are the choices:
A. subset
B. subscript
C. consonant
D. covalent bond | If only one atom of a specific type is present, no subscript is used. | B: subscript. |
What are the earliest reptile genus named?
Here are the choices:
A. collorhabdium
B. hylonomus
C. scolecophis
D. brachyophis | Earliest Reptile: Hylonomus . The earliest known reptile is given the genus name Hylonomus . It was about 20 to 30 centimeters (8 to 12 inches) long, lived in swamps, and ate insects and other small invertebrates. | B: hylonomus. |
What produces all the cells of the root and the root cap?
Here are the choices:
A. interior meristem
B. apical meristem
C. algal meristem
D. somatic meristem | B: apical meristem. | |
What is the master gland of the endocrine system?
Here are the choices:
A. Thymus
B. pituitary gland
C. Thyroid
D. Hypothyroid | The hypothalamus is part of the brain and also secretes hormones, thus connecting the nervous and endocrine systems. The pituitary gland is the master gland of the endocrine system and controls other endocrine glands. Endocrine glands also include the thyroid gland, adrenal glands, pancreas, and gonads. | B: pituitary gland. |
The earth’s biomes are categorized into two major groups named what?
Here are the choices:
A. terrestrial and galactic
B. aquatic and galactic
C. terrestrial and aquatic
D. icelandic and aquatic | 44.3 | Terrestrial Biomes By the end of this section, you will be able to: • Identify the two major abiotic factors that determine terrestrial biomes • Recognize distinguishing characteristics of each of the eight major terrestrial biomes The Earth’s biomes are categorized into two major groups: terrestrial and aquatic... | C: terrestrial and aquatic. |
What does the thymus gland produce?
Here are the choices:
A. hormones
B. t cells
C. b cells
D. insulin | Organs of the lymphatic system include the tonsils, thymus gland and spleen. The thymus gland produces T cells or T-lymphocytes (see below) and the spleen and tonsils help in fighting infections. The spleen’s main function is to filter the blood. The spleen also detects viruses and bacteria and triggers the release of ... | B: t cells. |
During which phase does dna replication occur in the cell cycle?
Here are the choices:
A. synthesis
B. mitosis
C. resting
D. gap | 9.2 | DNA Replication By the end of this section, you will be able to: • Explain the process of DNA replication • Explain the importance of telomerase to DNA replication • Describe mechanisms of DNA repair When a cell divides, it is important that each daughter cell receives an identical copy of the DNA. This is accomp... | A: synthesis. |
What kind of interactions do polar substances experience?
Here are the choices:
A. dipole-dipole interactions
B. monopole-monopole interactions
C. monopole-dipole interactions
D. axial interactions | Substances that are polar experience dipole-dipole interactions. | A: dipole-dipole interactions. |
Which process is glycolysis in during cellular respiration?
Here are the choices:
A. hydrolysis
B. anaerobic
C. aerobic
D. enzymatic | Cellular respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport. Glycolysis is an anaerobic process. The other two stages are aerobic processes. | B: anaerobic. |
Saturated hydrocarbons are given the general name of what?
Here are the choices:
A. carbohydrates
B. enzymes
C. alkanes
D. lipids | Saturated hydrocarbons are given the general name of alkanes. The name of specific alkanes always ends in –ane and has a prefix to indicate how many carbon atoms it has. | C: alkanes. |
In the cellular process of transcription, dna code is converted into what other kind of code?
Here are the choices:
A. sna
B. rna
C. fna
D. dpa | 3.4 Protein Synthesis DNA stores the information necessary for instructing the cell to perform all of its functions. Cells use the genetic code stored within DNA to build proteins, which ultimately determine the structure and function of the cell. This genetic code lies in the particular sequence of nucleotides that ma... | B: rna. |
If a gyroscope is not spinning, it acquires angular momentum in the direction of what?
Here are the choices:
A. velocity
B. acceleration
C. torque
D. gravity | This same logic explains the behavior of gyroscopes. Figure 10.31 shows the two forces acting on a spinning gyroscope. The torque produced is perpendicular to the angular momentum, thus the direction of the torque is changed, but not its magnitude. The gyroscope precesses around a vertical axis, since the torque is alw... | C: torque. |
Which leukocytes are first to respond to bacterial infections?
Here are the choices:
A. neutrophils
B. erythrocytes
C. microcytes
D. chemocytes | 18.4 Leukocytes and Platelets Leukocytes function in body defenses. They squeeze out of the walls of blood vessels through emigration or diapedesis, then may move through tissue fluid or become attached to various organs where they fight against pathogenic organisms, diseased cells, or other threats to health. Granular... | A: neutrophils. |
What thin whip-like structures help prokaryotes move toward food or away from toxins?
Here are the choices:
A. flagella
B. cilia
C. sporangia
D. antennae | Most prokaryotes have one or more long, thin "whips" called flagella (flagellum, plural) . You can see flagella in Figure below . Flagella help prokaryotes move toward food or away from toxins. Each flagellum spins around a fixed base. This causes the cell to roll and tumble. | A: flagella. |
What common process is used in the production of bread, cheese and alcoholic beverages?
Here are the choices:
A. condensation
B. fermentation
C. oxidation
D. cloning | agents of fermentation in the production of bread, cheeses, alcoholic beverages, and numerous other food preparations. Secondary metabolites of fungi are used in medicine as antibiotics and anticoagulants. Fungi are used in research as model organisms for the study of eukaryotic genetics and metabolism. | B: fermentation. |
Comprising 10 percent of the mass of the brain, what structure has varied functions that all point to a role in the motor system?
Here are the choices:
A. cerebellum
B. medulla oblongata
C. superior peduncle
D. cerebrum | 16.5 | The Coordination and Gait Exams By the end of this section, you will be able to: • Explain the relationship between the location of the cerebellum and its function in movement • Chart the major divisions of the cerebellum • List the major connections of the cerebellum • Describe the relationship of the cerebellu... | A: cerebellum. |
What is a segment of dna that carries a code for making a specific polypeptide chain called?
Here are the choices:
A. nucleotide
B. amino acid
C. a protein
D. a gene | Each particular organism contains many protein molecules that are specific to that organism. The particular base sequence of DNA is responsible for the production of all of the different proteins that are present in each and every living thing that has ever inhabited the Earth. How does that work? Cells use the unique ... | D: a gene. |
Introduction of antigens into the body through immunization can confer what benefit?
Here are the choices:
A. active respiration
B. growth rate
C. active immunity
D. sensitive immunity | C: active immunity. | |
What part of the brain is largest in intelligent mammals?
Here are the choices:
A. cerebrum
B. cortex
C. thallus
D. manubrium | In intelligent mammals, such as primates, the cerebrum is larger compared to the rest of the brain. A larger cerebrum allows primates to develop higher levels of intelligence. Primates have the ability to learn new behaviors. They also engage in complex social interactions, such as fighting and play. | A: cerebrum. |
What is the cause of most ocean waves?
Here are the choices:
A. Magnetic pull
B. Gravity
C. tides
D. winds | Most ocean waves are caused by winds. The size of a wave depends on how fast, how far, and how long the wind blows. Tsunamis are waves caused by earthquakes. | D: winds. |
What is the lowest layer of the atmosphere called?
Here are the choices:
A. lithosphere
B. mesosphere
C. troposphere
D. asthenosphere | Air movement takes place in the troposphere. This is the lowest layer of the atmosphere. Air moves because of differences in heating. These differences create convection currents and winds ( Figure below ). | C: troposphere. |
What is the biggest group of animals on the planet?
Here are the choices:
A. carnivores
B. arthropods
C. herbivores
D. mammles | How often do you think you see an arthropod? Well, have you ever looked up close at an ant? A spider? A fly? A moth? With over a million described species (and many more yet to be described) in the phylum containing arthropods, chances are, you encounter one of these organisms every day, without even leaving your house... | B: arthropods. |
The presence of solute particles blocks some of the ability for liquid particles to do what?
Here are the choices:
A. dissolve
B. melt
C. evaporate
D. fuse | The presence of solute particles blocks some of the ability for liquid particles to evaporate. Thus, solutions of solid solutes typically have a lower vapor pressure than the pure solvent. | C: evaporate. |
What are color and hardness physical properties of?
Here are the choices:
A. cells
B. elements
C. ions
D. matter | A: You can see that snow and sand have a different color. You can also feel that snow is softer than sand. Both color and hardness are physical properties of matter. | D: matter. |
What are steroid hormones made of?
Here are the choices:
A. lipids
B. water
C. amino acid
D. organisms | Steroid hormones are made of lipids, such as phospholipids and cholesterol. They are fat soluble, so they can diffuse across the plasma membrane of target cells and bind with receptors in the cytoplasm of the cell (see Figure below ). The steroid hormone and receptor form a complex that moves into the nucleus and influ... | A: lipids. |
How many processes contribute to the emergence of viral diseases?
Here are the choices:
A. three
B. four
C. two
D. one | A: three. | |
What type of scale is the richter scale?
Here are the choices:
A. logarithmic
B. algorithmic
C. dimensional
D. asymmetric | 7. Like the Richter scale, the moment magnitude scale is logarithmic. The 2011 Tōhoku earthquake in Japan was 9.0 and did tremendous damage. A few months earlier, an 8.8 struck Chile and did much less damage. Why?. | A: logarithmic. |
Where is pedocal soil commonly found?
Here are the choices:
A. grasslands
B. deserts
C. forests
D. slopes | Pedocal is the soil common in grasslands. The more arid climate increases calcium in the soil. Pedocal is not as fertile. | A: grasslands. |
What are the key cells in the immune response?
Here are the choices:
A. erythrocytes
B. lymphocytes
C. leukocytes
D. keratinocytes | Lymphocytes are the key cells in the immune response. They are leukocytes that become activated by a particular antigen. There are two major type of lymphocytes: B cells and T cells. | B: lymphocytes. |
Where are most chloroplasts found in plants?
Here are the choices:
A. flowers
B. stems
C. roots
D. leaves | In plants, most chloroplasts are found in the leaves. Therefore, all the raw materials needed for photosynthesis must be present in the leaves. These materials include light, water, and carbon dioxide. The shape of the leaves gives them a lot of surface area to absorb light for photosynthesis. Roots take up water from ... | D: leaves. |
What type of x-linked trait is color blindness?
Here are the choices:
A. conscientiousness trait
B. recessive
C. predominant
D. dominant | Pedigree for Color Blindness. Color blindness is an X-linked recessive trait. Mothers pass the recessive allele for the trait to their sons, who pass it to their daughters. | B: recessive. |
What do you call a condensation reaction in which an ester is formed from an alcohol and a carboxylic acid?
Here are the choices:
A. transesterification
B. esterisation
C. decarboxylation
D. esterification | An esterification is a condensation reaction in which an ester is formed from an alcohol and a carboxylic acid. Esterification is a subcategory of condensation reactions because a water molecule is produced in the reaction. The reaction is catalyzed by a strong acid, usually sulfuric acid. When the carboxylic acid buta... | D: esterification. |
These types of cella support young, growing parts of a plant?
Here are the choices:
A. angular cells
B. pinworm cells
C. collenchyma cells
D. epidermal cells | C: collenchyma cells. | |
What can be used to convert the energy provided by the sun to usable electrical energy?
Here are the choices:
A. solar cells
B. Pannels
C. Wind Mills
D. Power Plants | Solar cells convert the energy in sunlight to electrical energy. They contain a material such as silicon that absorbs light energy and gives off electrons. | A: solar cells. |
Most plant cells have a large central what?
Here are the choices:
A. loci
B. membranes
C. vacuole
D. nuclei | Most plant cells have a large central vacuole . It can make up as much as 90 percent of a plant cell’s total volume. The central vacuole is like a large storage container. It may store substances such as water, enzymes, and salts. It may have other roles as well. For example, the central vacuole helps stems and leaves ... | C: vacuole. |
When you heat a pot of water on a stove top, energy moves from the pot to its metal handle by what process?
Here are the choices:
A. induction
B. conduction
C. convection
D. thermal radiation | Sunlight is turned into electricity at a solar power plant. These power plants use a large group of mirrors to focus sunlight on one place. This place is called a receiver ( Figure below ). At the receiver, a liquid such as oil or water is heated to a high temperature. The liquid transfers its heat by conduction . In c... | B: conduction. |
Of all the mineral nutrients, what contributes the most to plant growth and crop yields?
Here are the choices:
A. methane
B. oxygen
C. nitrogen
D. silicon | C: nitrogen. | |
What do you call a reaction that consumes energy as it is carried out?
Here are the choices:
A. exothermic
B. endothermic
C. unstable
D. autotrophic | The exothermic reaction on the left releases energy. The endothermic reaction on the right consumes energy. | B: endothermic. |
What type of rain dissolves and damages stone buildings and statues?
Here are the choices:
A. stored rain
B. acid rain
C. morning rain
D. plastic rain | A: Acid rain dissolves and damages stone buildings and statues. The Figure below shows a statue that has been damaged by acid rain. | B: acid rain. |
What organ packages nutrients absorbed by the digestive system; produces plasma proteins, clotting factors, and bile; and disposes of worn-out cell components and waste products?
Here are the choices:
A. liver
B. brain
C. liver
D. heart | Hepatic Portal System The liver is a complex biochemical processing plant. It packages nutrients absorbed by the digestive system; produces plasma proteins, clotting factors, and bile; and disposes of worn-out cell components and waste products. Instead of entering the circulation directly, absorbed nutrients and certa... | A: liver. |
What is defined as a push or pull acting on an object?
Here are the choices:
A. effort
B. force
C. motion
D. work | Force is defined as a push or pull acting on an object. Forces include gravity, friction, and applied force. | B: force. |
How much time does the moon take to complete one revolution around the earth?
Here are the choices:
A. one day
B. one week
C. one year
D. one month | D: one month. | |
Like other amphibians, frogs generally lay their eggs in moist environments, which are required since the eggs lack what feature?
Here are the choices:
A. nucleus
B. tubes
C. membrane
D. shells | Frog eggs are fertilized externally, and like other amphibians, frogs generally lay their eggs in moist environments. A moist environment is required as eggs lack a shell and thus dehydrate quickly in dry environments. Frogs demonstrate a great diversity of parental behaviors, with some species laying many eggs and exh... | D: shells. |
What is the ratio of a wave frequency to its vibration frequency?
Here are the choices:
A. three
B. same
C. two
D. one | The frequency of a wave is the same as the frequency of the vibrations that caused the wave. For example, to generate a higher-frequency wave in a rope, you must move the rope up and down more quickly. This takes more energy, so a higher-frequency wave has more energy than a lower-frequency wave with the same amplitude... | B: same. |
What is the hollow and muscular balloon-shaped organ that collects urine?
Here are the choices:
A. prostate
B. urinary bladder
C. kidney
D. urethra | The urinary bladder is a hollow and muscular organ. It is shaped a little like a balloon. It is the organ that collects urine. | B: urinary bladder. |
Sugars, starches, and cellulose are examples of what biochemical compounds that organisms use for energy?
Here are the choices:
A. calories
B. prokaryotes
C. proteins
D. carbohydrates | Carbohydrates are biochemical compounds that include sugars, starches, and cellulose. They contain oxygen in addition to carbon and hydrogen. Organisms use carbohydrates mainly for energy. | D: carbohydrates. |
During the embryonic stage of vertebrates, the notochord develops into what?
Here are the choices:
A. rib cage
B. brain stem
C. backbone
D. umbilical cord | Living chordates are mainly vertebrates. In vertebrates, the notochord develops into a backbone, or vertebral column, after the embryonic stage. A small percentage of chordates are invertebrates. Their notochord never develops into a backbone. Invertebrate chordates include tunicates and lancelets. Both groups of anima... | C: backbone. |
What category of joints is immovable?
Here are the choices:
A. sporozoans
B. amphiarthroses
C. diarthroses
D. synarthrosis | Classification of Joints on the Basis of Function The functional classification divides joints into three categories: synarthroses, amphiarthroses, and diarthroses. A synarthrosis is a joint that is immovable. This includes sutures, gomphoses, and synchondroses. Amphiarthroses are joints that allow slight movement, inc... | D: synarthrosis. |
What do male cones in seed plants contain?
Here are the choices:
A. pollen
B. nutrients
C. nitrogen
D. spores | A: pollen. | |
What kind of harm does a corrosive substance cause?
Here are the choices:
A. Attracts dust
B. Rust objects
C. eats through objects
D. Builds a crust | If a substance is corrosive, it can eat through objects. Many scientists have to work with chemicals that are corrosive or otherwise dangerous. That's one reason that following safety precautions in the laboratory or field is very important. | C: eats through objects. |
Receptors for what chemical messengers recognize molecules with specific shapes and side groups, and respond only to those that are recognized?
Here are the choices:
A. acids
B. hormones
C. chromosomes
D. enzymes | Pathways of Hormone Action The message a hormone sends is received by a hormone receptor, a protein located either inside the cell or within the cell membrane. The receptor will process the message by initiating other signaling events or cellular mechanisms that result in the target cell’s response. Hormone receptors r... | B: hormones. |
A hydraulic jack that makes it possible to lift a car easily is an example of what, meaning it produces mechanical advantages?
Here are the choices:
A. complex machines
B. simple machine
C. simple weapon
D. quantum physics | A person is able to lift the entire rear end of the automobile using only one hand with the hydraulic jack shown in the image. Hydraulic systems are similar to simple machines in that they can produce very large mechanical advantages. | B: simple machine. |
What process consists of the mechanisms that produce an observed pattern of change?
Here are the choices:
A. evolution
B. cycle
C. repetition
D. variation | A: evolution. | |
Prokaryotic cells have a cell wall located outside of the __________?
Here are the choices:
A. chromosomes
B. chloroplasts
C. plasma membrane
D. epidermis | Prokaryotic cells have a cell wall outside their plasma membrane. | C: plasma membrane. |
Multiplying the linear momentum of a spinning object by the radius calculates what?
Here are the choices:
A. angular torque
B. angular momentum
C. total momentum
D. applied momentum | The angular momentum of a spinning object can be found in two equivalent ways. Just like linear momentum, one way, shown in the first equation, is to multiply the moment of inertia, the rotational analog of mass, with the angular velocity. The other way is simply multiplying the linear momentum by the radius, as shown ... | B: angular momentum. |
What are responsible for removing excess h+ ions from the blood?
Here are the choices:
A. intestinal walls
B. kidneys
C. liver nodes
D. stomach chambers | The kidneys are responsible for removing excess H+ ions from the blood. If the kidneys fail, what would happen to blood pH and to hemoglobin affinity for oxygen? Factors That Affect Oxygen Binding The oxygen-carrying capacity of hemoglobin determines how much oxygen is carried in the blood. In addition to P O , 2 other... | B: kidneys. |
What makes up the dense outer layer of bones?
Here are the choices:
A. scales
B. compact bone
C. marrow
D. cartilage | Compact bone makes up the dense outer layer of bones. | B: compact bone. |
What refers to a substance made from two or more elements joined by chemical bonds?
Here are the choices:
A. compound
B. contrast
C. basic
D. component | In nature, elements rarely occur alone. Instead, they combine to form compounds. A compound is a substance composed of two or more elements joined by chemical bonds. For example, the compound glucose is an important body fuel. It is always composed of the same three elements: carbon, hydrogen, and oxygen. Moreover, the... | A: compound. |
Stress building up at the same rate over time at a fault causes what phenomenon?
Here are the choices:
A. erosion
B. storms
C. earthquakes
D. volcanoes | When an earthquake will occur is much more difficult to predict. Stress on a fault builds up at the same rate over time. So earthquakes should occur at regular intervals. But, so far, scientists cannot predict when quakes will occur even to within a few years. Around Parkfield, California, an earthquake of magnitude 6.... | C: earthquakes. |
Materials made from non-living substances like pebbles and sand are called what?
Here are the choices:
A. organic
B. inorganic
C. microscopic
D. fibrous | Some of them are inorganic . Inorganic materials are made from non-living substances like pebbles and sand. | B: inorganic. |
What type of gas levels in the atmosphere are increasing?
Here are the choices:
A. hydrogen gas
B. carbonate gas
C. greenhouse gas
D. helium gas | Greenhouse gas levels in the atmosphere are increasing. Global temperatures are increasing. | C: greenhouse gas. |
What is the earths crust composed of?
Here are the choices:
A. sedimentary rock
B. metamorphic rock
C. igneuos rock
D. bicellular rock | Like Earth, the Moon has a distinct crust, mantle, and core. The crust is composed of igneous rock. This rock is rich in the elements oxygen, silicon, magnesium, and aluminum. On the near side, the Moon’s crust is about 30 kilometers thick. On the far side, the crust is about 100 kilometers thick. The mantle is made of... | C: igneuos rock. |
Cells that are divided by oncogenes contain damaged what?
Here are the choices:
A. atoms
B. dna
C. bacteria
D. cells | Proto-oncogenes normally help control cell division. Mutations in these genes turn them into oncogenes. Oncogenes promote the division of cells with damaged DNA. | B: dna. |
When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes?
Here are the choices:
A. during mitosis
B. during diversion
C. during meiosis
D. during crossing-over | During crossing-over, segments of DNA are exchanged between non-sister chromatids of homologous chromosomes. Notice how this can result in an allele (A) on one chromosome being moved to the other chromosome. The four chromatids compose the tetrad, with a chiasma at the point of exchange. | D: during crossing-over. |
What are observable patterns of stars found in the night sky called?
Here are the choices:
A. constellations
B. deformations
C. deviations
D. latitudes | Humans have been studying the night sky for thousands of years. Knowing the motions of stars helped people keep track of seasons. With this information they could know when to plant crops. Stars were so important that the patterns they made in the sky were named. These patterns are called constellations . Even now, con... | A: constellations. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.