questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
Scientists utilize what natural process to teach cranes born in captivity to migrate along safe routes?
Here are the choices:
A. natural selection
B. neuroimaging
C. expediting
D. imprinting | D: imprinting. | |
What are mass, volume, and length an example of?
Here are the choices:
A. fantastic properties
B. extensive compounds
C. dynamic properties
D. extensive properties | Extensive properties vary according to the amount of matter present. Examples of extensive properties include mass, volume, and length. | D: extensive properties. |
Chelicerata are know for their first pair of appendages, also know as what?
Here are the choices:
A. maxillae
B. chelicides
C. ambers
D. chelicerae | Subphylum Chelicerata includes animals such as spiders, scorpions, horseshoe crabs, and sea spiders. This subphylum is [4] predominantly terrestrial, although some marine species also exist. An estimated 103,000 described species are included in subphylum Chelicerata. The body of chelicerates may be divided into two pa... | D: chelicerae. |
What kind of reproduction generates new individuals without fusion of an egg and sperm?
Here are the choices:
A. propagation
B. gametes
C. asexual
D. sexual | C: asexual. | |
The properties of liquids are intermediate between those of gases and solids but are more similar to?
Here are the choices:
A. plasma
B. solids
C. oils
D. gases | The properties of liquids are intermediate between those of gases and solids but are more similar to solids. In contrast to intramolecular forces, such as the covalent bonds that hold atoms together in molecules and polyatomic ions, intermolecular forces hold molecules together in a liquid or solid. Intermolecular forc... | B: solids. |
What does blood pickup from the lungs to be carried throughout the rest of the body?
Here are the choices:
A. platelets
B. carbon
C. white blood cells
D. oxygen | The blood picks up oxygen in the lungs and carries it to cells throughout the body. | D: oxygen. |
The earliest types of what lacked flowers, leaves, roots and stems?
Here are the choices:
A. houses
B. animals
C. plants
D. clouds | Most modern plants, like the skunk cabbage, produce flowers. However, flowers evolved relatively late in the history of plants. The earliest plants not only lacked flowers. They also lacked leaves, roots, and stems. They probably resembled the alga in Figure below . | C: plants. |
The nervous system is made up of these?
Here are the choices:
A. fibers
B. blood cells
C. neurons
D. muscles | Watch this video (http://openstaxcollege. org/l/vertebrate_evol) of biologist Mark Kirschner discussing the “flipping” phenomenon of vertebrate evolution. The nervous system is made up of neurons, specialized cells that can receive and transmit chemical or electrical signals, and glia, cells that provide support functi... | C: neurons. |
What are regular changes in biology or behavior that occur in a 24 hour cycle?
Here are the choices:
A. auditory rhythm
B. cognitive rhythm
C. circadian rhythm
D. life cycle | Circadian rhythms are regular changes in biology or behavior that occur in a 24-hour cycle. In humans, for example, blood pressure and body temperature change in a regular way throughout each 24-hour day. | C: circadian rhythm. |
Did darwin believe in punctuated equilibrium or gradualism?
Here are the choices:
A. neither
B. it depended
C. gradualism
D. punctuated equilibrium | Darwin thought that evolution occurs gradually. This model of evolution is called gradualism. The fossil record better supports the model of punctuated equilibrium. In this model, long periods of little change are interrupted by bursts of rapid change. | C: gradualism. |
What is the term for a solution that resists dramatic changes in ph?
Here are the choices:
A. stable
B. inert
C. neutral
D. buffer | As indicated in Section 12.4 "Strong and Weak Acids and Bases and Their Salts", weak acids are relatively common, even in the foods we eat. But we occasionally encounter a strong acid or base, such as stomach acid, which has a strongly acidic pH of 1.7. By definition, strong acids and bases can produce a relatively lar... | D: buffer. |
Wood consists of mainly what kind of walls?
Here are the choices:
A. primary
B. chaotic
C. aquatic
D. secondary | D: secondary. | |
Viruses lack metabolic enzymes and equipment for making what?
Here are the choices:
A. dna
B. acids
C. cells
D. proteins | D: proteins. | |
What are non-steroid hormones made of?
Here are the choices:
A. proteins
B. amino acids
C. Molecules
D. fats | Non-steroid hormones are made of amino acids. They are not fat soluble, so they cannot diffuse across the plasma membrane of target cells. Instead, a non-steroid hormone binds to a receptor on the cell membrane (see Figure below ). The binding of the hormone triggers an enzyme inside the cell membrane. The enzyme activ... | B: amino acids. |
The german physicist max planck (1858–1947) used the idea that atoms and molecules in a body act like oscillators to absorb and emit this?
Here are the choices:
A. energy
B. blood
C. radiation
D. convection | Where is the quantization of energy observed? Let us begin by considering the emission and absorption of electromagnetic (EM) radiation. The EM spectrum radiated by a hot solid is linked directly to the solid’s temperature. (See Figure 29.3. ) An ideal radiator is one that has an emissivity of 1 at all wavelengths and,... | C: radiation. |
The process of microscope mountains and valleys on the surface of a material interacting with another material is called?
Here are the choices:
A. tension
B. vibration
C. friction
D. motion | Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. Look at the metal surfaces in the Figure below . The aluminum foil is so smooth that it’s shiny. However, when highly magnified, the surface of metal appears... | C: friction. |
What do you call any device that makes work easier by changing a force?
Here are the choices:
A. machine
B. technology
C. invention
D. battery | A machine is any device that makes work easier by changing a force. Work is done whenever a force moves an object over a distance. The amount of work done is represented by the equation:. | A: machine. |
In what organ is food remains turned into solid waste for excretion?
Here are the choices:
A. large metabolism
B. large tissue
C. non-transverse intenstine
D. large intestine | Recall that carbon dioxide travels through the blood and is transferred to the lungs where it is exhaled. In the large intestine, the remains of food are turned into solid waste for excretion. How is waste other than carbon dioxide removed from the blood? That is the role of the kidneys. | D: large intestine. |
What is the type of cancer where bone marrow produces abnormal white blood cells?
Here are the choices:
A. leukemia
B. liver
C. kidney
D. anemia | Leukemia is a type of cancer in which bone marrow produces abnormal white blood cells. The abnormal cells can’t do their job of fighting infections. Like most cancers, leukemia is thought to be caused by a combination of genetic and environmental factors. It is the most common cancer in children. | A: leukemia. |
What cells are typically characterized by the polarized distribution of organelles and membrane-bound proteins between their basal and apical surfaces?
Here are the choices:
A. connective tissue
B. epithelial cells
C. mast cells
D. nerve cells | The Epithelial Cell Epithelial cells are typically characterized by the polarized distribution of organelles and membrane-bound proteins between their basal and apical surfaces. Particular structures found in some epithelial cells are an adaptation to specific functions. Certain organelles are segregated to the basal s... | B: epithelial cells. |
Condensation, melting, deposition, sublimation, vaporization, and freezing are all considered changes in what?
Here are the choices:
A. altitude
B. speed
C. density
D. state | Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter’s chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization. These changes are shown in Figure below . Each is descr... | D: state. |
Myopia and hyperopia are defects that can be corrected with devices?
Here are the choices:
A. casts
B. lenses
C. crutches
D. fins | Myopia and hyperopia can be corrected with lenses. | B: lenses. |
What do you call the part of the skeletal system that connects bones?
Here are the choices:
A. tissue
B. joints
C. muscles
D. fibers | Running. A means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. The knees, which connect one part of the leg to the other, have to allow the legs to move. The knee is a joint, the part of the skeletal system that connects bones. | B: joints. |
What type of molecules sit within a membrane and contain an aqueous channel that spans the membrane’s hydrophobic region?
Here are the choices:
A. channel
B. mole
C. microorganisms
D. osmotic fluid | you could prove that movements are occurring even in the absence of a gradient. In a similar manner, there are analogous carrier systems that move hydrophobic molecules through water. Channel molecules sit within a membrane and contain an aqueous channel that spans the membrane’s hydrophobic region. Hydrophilic molecul... | A: channel. |
What state of matter has a definite volume, but takes the shape of the container?
Here are the choices:
A. gas
B. solid
C. liquid
D. plasma | Liquids have a definite volume, but take the shape of the container. | C: liquid. |
Where does the earth gets its energy from?
Here are the choices:
A. decomposers
B. precipitation
C. sun
D. heat | Earth gets its energy from the Sun. The Sun gives off photons of energy that travel in waves. All the wavelengths of the Sun’s energy make up the electromagnetic (EM) spectrum. | C: sun. |
In chemical reactions, what substances can act like metals or nonmetals, depending on their number of electrons?
Here are the choices:
A. diacritics
B. minerals
C. metalloids
D. synthetics | How metalloids behave in chemical interactions with other elements depends mainly on the number of electrons in the outer energy level of their atoms. Metalloids may act either like metals or nonmetals in chemical reactions. | C: metalloids. |
In the lungs, air is diverted into smaller and smaller passages called what?
Here are the choices:
A. ion channels
B. alveoli
C. ectoderm
D. bronchi | In the lungs, air is diverted into smaller and smaller passages, or bronchi. Air enters the lungs through the two primary (main) bronchi (singular: bronchus). Each bronchus divides into secondary bronchi, then into tertiary bronchi, which in turn divide, creating smaller and smaller diameter bronchioles as they split a... | D: bronchi. |
How did a vascular let plants grow?
Here are the choices:
A. they could bear fruit
B. they could grow taller
C. they could conduct photosynthesis
D. they could reproduce | The evolution of vascular tissue revolutionized the plant kingdom. Vascular tissue greatly improved the ability of plants to absorb and transfer water. This allowed plants to grow larger and taller. They could also liver in drier habitats and survive periods of drought. Early vascular plants probably resembled the fern... | B: they could grow taller. |
When a soluble compound dissolves, its constituent atoms, molecules, or ions disperse throughout what?
Here are the choices:
A. gel
B. solvent
C. pigment
D. liquid | When a soluble compound dissolves, its constituent atoms, molecules, or ions disperse throughout the solvent. In contrast, the constituents of an insoluble compound remain associated with one another in the solid. A soluble compound is a strong electrolyte if it dissociates completely into ions, a weak electrolyte if i... | B: solvent. |
Many viral diseases can be prevented by giving people what?
Here are the choices:
A. cancers
B. vaccines
C. pesticides
D. Lactose | Many viral diseases can be prevented by giving people vaccines (see Figure below ). A vaccine is a substance that contains pathogens such as viruses. The pathogens have been changed in some way so they no longer cause disease. However, they can still provoke a response from the host’s immune system. This results in imm... | B: vaccines. |
What purpose does the appendix serve in humans today?
Here are the choices:
A. work
B. none
C. filters blood
D. digests food | Structures like the human tail bone are called vestigial structures . Evolution has reduced their size because the structures are no longer used. The human appendix is another example of a vestigial structure. It is a tiny remnant of a once-larger organ. In a distant ancestor, it was needed to digest food. It serves no... | B: none. |
What is the bulb called in the frontal lobe that processes smells?
Here are the choices:
A. auditory bulb
B. sensory bulb
C. olfactory bulb
D. peripheral bulb | The frontal lobe is located at the front of the brain, over the eyes. This lobe contains the olfactory bulb, which processes smells. The frontal lobe also contains the motor cortex, which is important for planning and implementing movement. Areas within the motor cortex map to different muscle groups, and there is some... | C: olfactory bulb. |
According to early accounts, newton was inspired to make the connection between falling bodies and astronomical motions when he saw an apple fall from a tree and realized that if the gravitational force could extend above the ground to a tree, it might also reach this?
Here are the choices:
A. stars
B. horizon
C. sun
D... | Figure 6.20 According to early accounts, Newton was inspired to make the connection between falling bodies and astronomical motions when he saw an apple fall from a tree and realized that if the gravitational force could extend above the ground to a tree, it might also reach the Sun. The inspiration of Newton’s apple i... | C: sun. |
Gravitational force on a large scale dominates interactions between large objects because it is always what?
Here are the choices:
A. attractive
B. vulnerable
C. ugly
D. suitable | As the example implies, gravitational force is completely negligible on a small scale, where the interactions of individual charged particles are important. On a large scale, such as between the Earth and a person, the reverse is true. Most objects are nearly electrically neutral, and so attractive and repulsive Coulom... | A: attractive. |
What two microorganisms have different membrane lipids?
Here are the choices:
A. microsporidia and bacteria
B. archaea and bacteria
C. mesozoic and bacteria
D. algae and bacteria | B: archaea and bacteria. | |
Sharing a phylum with insects, spiders, daddy-long-legs, scorpions, and ticks belong to what class?
Here are the choices:
A. annelids
B. mammals
C. reptiles
D. arachnids | Arachnids include spiders, daddy-long-legs, scorpions, and ticks. | D: arachnids. |
What describes the amount of solute in a solution?
Here are the choices:
A. frequency
B. viscosity
C. solubility
D. tonicity | Tonicity Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of... | D: tonicity. |
What is the layer above the mesophere called?
Here are the choices:
A. thermosphere
B. exosphere
C. stratosphere
D. troposphere | The mesosphere is the layer above the stratosphere. It rises to about 85 kilometers (53 miles) above the surface. Temperature decreases with altitude in this layer. | C: stratosphere. |
The fundamental unit of time, the second, is based on what type of clock?
Here are the choices:
A. atomic clock
B. eternal clock
C. quantum clock
D. gravity clock | Figure 1.18 An atomic clock such as this one uses the vibrations of cesium atoms to keep time to a precision of better than a microsecond per year. The fundamental unit of time, the second, is based on such clocks. This image is looking down from the top of an atomic fountain nearly 30 feet tall! (credit: Steve Jurvets... | A: atomic clock. |
In a carbon triple bond, how many pairs of electrons are shared?
Here are the choices:
A. one
B. three
C. two
D. four | Carbon can form single, double, or even triple bonds with other carbon atoms. In a single bond, two carbon atoms share one pair of electrons. In a double bond, they share two pairs of electrons, and in a triple bond they share three pairs of electrons. Examples of compounds with these types of bonds are represented by ... | B: three. |
What is the reproductive part of the plant?
Here are the choices:
A. the stem
B. the core
C. the flower
D. the leaf | C: the flower. | |
The attraction of an atom for the electrons of a covalent bond is its what?
Here are the choices:
A. hardness
B. electronegativity
C. weight
D. brightness | B: electronegativity. | |
What substance do the leaves of plants take in from the environment?
Here are the choices:
A. hydrogen
B. oxygen
C. acid rain
D. carbon dioxide | D: carbon dioxide. | |
Controlled variables are kept what to prevent them from influencing the effects of the independent variable on the dependent variable?
Here are the choices:
A. temporary
B. fleeting
C. constant
D. mechanical | Scientific experiments involve controls , or subjects that are not tested during the investigation. In this way, a scientist limits the factors, or variables that can cause the results of an investigation to differ. A variable is a factor that can change over the course of an experiment. Independent variables are facto... | C: constant. |
What branch of biology uses fossils to study life’s history?
Here are the choices:
A. morphology
B. gerontology
C. paleontology
D. entomology | Paleontology, another branch of biology, uses fossils to study life’s history (Figure 1.20). Zoology and botany are the study of animals and plants, respectively. Biologists can also specialize as biotechnologists, ecologists, or physiologists, to name just a few areas. This is just a small sample of the many fields th... | C: paleontology. |
What occurs after gametes fuse and form a diploid zygote?
Here are the choices:
A. meiosis
B. reproduction
C. transcription
D. electrolysis | A: meiosis. | |
What is a trait whose allele is found on a sex chromosome called?
Here are the choices:
A. genomic trait
B. dimorphism - linked trait
C. sex-linked trait
D. gender trait | A sex-linked trait is a trait whose allele is found on a sex chromosome. The human X chromosome is significantly larger than the Y chromosome; there are many more genes located on the X chromosome than there are on the Y chromosome. As a result there are many more X-linked traits than there are Y-linked traits. Most se... | C: sex-linked trait. |
What is required when electrons are removed from an atom, and released from the process when an electron is added?
Here are the choices:
A. proton
B. fuel
C. nuclear
D. energy | When electrons are removed from an atom, that process requires energy to pull the electron away from the nucleus. Addition of an electron releases energy from the process. | D: energy. |
What do you call the angle of the earth's axis of rotation?
Here are the choices:
A. axial tilt
B. horizontal tilt
C. dynamic tilt
D. vertical tilt | Earth goes through regular changes in its position relative to the Sun. Its orbit changes slightly. Earth also wobbles on its axis of rotation. The planet also changes its axial tilt , the angle of its axis of rotation. These changes can affect Earth’s temperature. | A: axial tilt. |
What kind of structure do purines have?
Here are the choices:
A. helical stucture
B. double ring structure
C. single ring structure
D. triple ring structure | Figure 3.31 A nucleotide is made up of three components: a nitrogenous base, a pentose sugar, and one or more phosphate groups. Carbon residues in the pentose are numbered 1′ through 5′ (the prime distinguishes these residues from those in the base, which are numbered without using a prime notation). The base is attach... | B: double ring structure. |
Photoautotrophs use what energy source to self-manufacture their own food?
Here are the choices:
A. water
B. light
C. chlorophyll
D. air | every organism uses to power its metabolism. In brief, the energy of sunlight is captured and used to energize electrons, which are then stored in the covalent bonds of sugar molecules. How long lasting and stable are those covalent bonds? The energy extracted today by the burning of coal and petroleum products represe... | B: light. |
What is the process of getting oxygen into the body & releasing carbon dioxide called?
Here are the choices:
A. perspiration
B. photosynthesis
C. respiration
D. precipitation | The process of getting oxygen into the body and releasing carbon dioxide is called respiration. | C: respiration. |
What are plants that grow where people don't want them to and can take up space and use resources which hinders growth of more desirable plants?
Here are the choices:
A. weeds
B. grasses
C. native plants
D. shrubs | We obviously can’t live without plants, but sometimes they cause us problems. Many plants are weeds. Weeds are plants that grow where people don’t want them, such as gardens and lawns. They take up space and use resources, hindering the growth of more desirable plants. People often introduce plants to new habitats wher... | A: weeds. |
Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?
Here are the choices:
A. leading temperature
B. particular temperature
C. critical temperature
D. relaxed temperature | Check Your Learning Ammonia can be liquefied by compression at room temperature; oxygen cannot be liquefied under these conditions. Why do the two gases exhibit different behavior? Answer: The critical temperature of ammonia is 405.5 K, which is higher than room temperature. The critical temperature of oxygen is below ... | C: critical temperature. |
What occurs at joints?
Here are the choices:
A. nothing
B. respiration
C. digestion
D. body movements | Movements of the body occur at joints. Describe how muscles are arranged around the joints of the body. | D: body movements. |
What is the term for a symbiotic relationship in which the parasite benefits while the host is harmed?
Here are the choices:
A. reciprocity
B. pathology
C. parasitism
D. infection | Parasitism is a symbiotic relationship in which one species (the parasite ) benefits while the other species (the host ) is harmed. Many species of animals are parasites, at least during some stage of their life. Most species are also hosts to one or more parasites. | C: parasitism. |
Alpha particles, beta particles, and gamma particles are major types of what?
Here are the choices:
A. sound waves
B. visible light
C. radioactivity
D. microscopy | The major types of radioactivity include alpha particles, beta particles, and gamma rays. | C: radioactivity. |
What do obligate aerobes need to live?
Here are the choices:
A. oxygen
B. dioxide
C. acid
D. blood | Organisms that are obligate aerobes need oxygen to live. That is, they use oxygen as a terminal electron acceptor while making ATP (see the “Cellular Respiration” concept). Humans are obligate aerobes, and so are Mycobacterium tuberculosis bacteria. M. tuberculosis causes tuberculosis (TB). Obligate aerobes are found o... | A: oxygen. |
What is the standard measurement for mass?
Here are the choices:
A. grams
B. calories
C. volume
D. BMI | You’ve probably been using a ruler to measure length since you were in elementary school. But you may have made most of the measurements in English units of length, such as inches and feet. In science, length is most often measured in SI units, such as millimeters and centimeters. Many rulers have both types of units, ... | A: grams. |
What do you call the state in which a plant slows down cellular activities and may shed its leaves?
Here are the choices:
A. hibernation
B. recession
C. germination
D. dormancy | In biomes with cold climates, plants may adapt by becoming dormant during the coldest part of the year. Dormancy is a state in which a plant slows down cellular activities and may shed its leaves. Animals also adapt to cold temperatures. One way is with insulation in the form of fur and fat. This is how the polar bears... | D: dormancy. |
Is the rate of population growth increasing or decreasing?
Here are the choices:
A. suggesting
B. preventing
C. increasing
D. Vanishing. | As the human population continues to grow, different factors limit population in different parts of the world. Space, clean air, clean water, and food to feed everyone are limiting in some locations. Worldwide though, human ingenuity has not placed a limit on the population. Not only does the population increase, the r... | C: increasing. |
What does the human protein cytokine help fight?
Here are the choices:
A. parasites
B. toxins
C. mutations
D. infections | Bacteria are modified to produce the human protein cytokine. This is a protein that helps fight infections. | D: infections. |
What is the goal of science?
Here are the choices:
A. gain scholarships
B. increase knowledge
C. improve knowledge
D. improve life expectancy | The Hubble space telescope shows that technology and science are closely related. Technology uses science to solve problems, and science uses technology to make new discoveries. However, technology and science have different goals. The goal of science is to answer questions and increase knowledge. The goal of technolog... | B: increase knowledge. |
What is the temperature where molecular motion stops?
Here are the choices:
A. Absolute Freezing
B. absolute zero
C. Final Zero
D. mean zero | Absolute zero is the temperature where molecular motion stops and is the lowest possible temperature. | B: absolute zero. |
Early blastomeres can form what if isolated?
Here are the choices:
A. lesions
B. tumors
C. cancer
D. a complete embryo | D: a complete embryo. | |
What component of an organism, made up of many cells, in turn makes up an organ?
Here are the choices:
A. muscles
B. epidermis
C. tissues
D. molecules | C: tissues. | |
What form do alkali metals take at room temperature?
Here are the choices:
A. compound
B. liquid
C. gas
D. solid | Alkali metals are all solids at room temperature. | D: solid. |
What is the cutting and burning trees to clear land for farming called?
Here are the choices:
A. cut-and-smoke farming
B. drop-and-blaze agriculture
C. reduce-and-ignite agriculture
D. slash-and-burn agriculture | Cutting and burning trees to clear land for farming is called slash-and-burn agriculture. How does this affect the atmosphere?. | D: slash-and-burn agriculture. |
What is the name of the scientist who named neutrinos?
Here are the choices:
A. Einstein
B. Schrodinger
C. enrico fermi
D. Gibbs | The neutrino is a particle emitted in beta decay that was unanticipated and is of fundamental importance. The neutrino was not even proposed in theory until more than 20 years after beta decay was known to involve electron emissions. Neutrinos are so difficult to detect that the first direct evidence of them was not ob... | C: enrico fermi. |
What creates a new seafloor at the mid-ocean ridge?
Here are the choices:
A. glaciers
B. earthquake
C. hurricane
D. magma | Magma at the mid-ocean ridge creates new seafloor. | D: magma. |
What are hydrocarbons that contain only single bonds between carbon atoms called?
Here are the choices:
A. carcinogenic hydrocarbons
B. caloric hydrocarbons
C. unsaturated hydrocarbons
D. saturated hydrocarbons | Saturated hydrocarbons are hydrocarbons that contain only single bonds between carbon atoms. They are the simplest class of hydrocarbons. They are called saturated because each carbon atom is bonded to as many hydrogen atoms as possible. In other words, the carbon atoms are saturated with hydrogen. You can see an examp... | D: saturated hydrocarbons. |
The presence of what makes soil hold together more tightly and enables it to hold more water?
Here are the choices:
A. clay
B. salt
C. sand
D. glass | Soils with lots of very small spaces are water-holding soils. When clay is present in a soil, the soil holds together more tightly. Clay-rich soil can hold more water. | A: clay. |
What kind of anatomical structure consists of several types of tissues that together carry out particular functions?
Here are the choices:
A. system
B. organ
C. frame
D. valve | B: organ. | |
How many pathways do plants have for carbon fixation?
Here are the choices:
A. eleven
B. three
C. two
D. five | Plants have evolved three pathways for carbon fixation. | B: three. |
What is used to measure electric current?
Here are the choices:
A. atomizer
B. chronometer
C. anemometer
D. galvanometer | D: galvanometer. | |
What connects the fetus to the placenta?
Here are the choices:
A. microbial cord
B. umbilical cord
C. fallopian tube
D. eustachian tube | The fetus is connected to the placenta through the umbilical cord. | B: umbilical cord. |
When your body digests food, it breaks down the molecules of nutrients and releases what?
Here are the choices:
A. energy
B. calories
C. gas
D. waste materials | Carbohydrates, proteins, and lipids contain energy. When your body digests food, it breaks down the molecules of these nutrients. This releases the energy so your body can use it. | A: energy. |
The first period of the paleozoic era was called what?
Here are the choices:
A. permian
B. cambrian
C. carboniferous
D. ordovician | The first period of the Paleozoic Era was the Cambrian. By the beginning of the Paleozoic, organisms evolved shells. Shells could hold their soft tissues together. Shells could protect them from predators and from drying out. Some organisms evolved external skeletons. These are called exoskeletons . Organisms with hard... | B: cambrian. |
What is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone?
Here are the choices:
A. carbohydrate
B. amino acid
C. phospholipid
D. polymer | Figure 3.19 A phospholipid is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone. The phosphate may be modified by the addition of charged or polar chemical groups. Two chemical groups that may modify the phosphate, choline and serine, are shown here. Both choline and serine ... | C: phospholipid. |
Some women experience cramping and pain before and during what monthly cycle?
Here are the choices:
A. menstruation
B. reproduction
C. inflammation
D. deformation | Some women experience cramping and pain before and during menstruation. | A: menstruation. |
What is the attraction of oppositely charged ions caused by electron transfer called?
Here are the choices:
A. ionic bond
B. velocity bond
C. solvent bond
D. covalent bond | The attraction of oppositely charged ions caused by electron transfer is called an ionic bond. | A: ionic bond. |
What process converts the sun's hydrogen nuclei into helium?
Here are the choices:
A. nuclear fusion
B. combustion
C. nuclear fission
D. solar fission | Figure 32.19 Nuclear fusion in the Sun converts hydrogen nuclei into helium; fusion occurs primarily at the boundary of the helium core, where temperature is highest and sufficient hydrogen remains. Energy released diffuses slowly to the surface, with the exception of neutrinos, which escape immediately. Energy product... | A: nuclear fusion. |
Both solids and liquids hold a definite what?
Here are the choices:
A. volume
B. size
C. mass
D. shape | You encounter solids and liquids in many forms in your everyday life. Solids, unlike liquids, hold a definite shape. Both solids and liquids hold a definite volume. However, on a molecular level, these two states of matter are quite different. In this lesson we will introduce some of the properties of liquids and solid... | A: volume. |
Because the fields that make up an electromagnetic wave are at right angles to each other and to the direction that the wave travels, an electromagnetic wave is considered what?
Here are the choices:
A. transverse wave
B. insverse wave
C. stimulation wave
D. transverse wave | As you can see in Figure above , the electric and magnetic fields that make up an electromagnetic wave occur are at right angles to each other. Both fields are also at right angles to the direction that the wave travels. Therefore, an electromagnetic wave is a transverse wave. | A: transverse wave. |
Which measure indicates the number of electrons in a given sublevel?
Here are the choices:
A. superscripts
B. mole
C. subscripts
D. coefficients | There are no forces of attraction or repulsion between gas particles . Attractive forces are responsible for particles of a real gas condensing together to form a liquid. It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion ... | A: superscripts. |
Because force and electric field are what, they have direction as well as their value?
Here are the choices:
A. neurons
B. sensors
C. mass
D. vectors | Force and electric field are vectors and thus have direction as well as their value. | D: vectors. |
Acceleration is a vector, and thus has a both a magnitude and what else?
Here are the choices:
A. wavelength
B. pressure
C. temperature
D. direction | Acceleration is a vector, and thus has a both a magnitude and direction. Acceleration can be caused by either a change in the magnitude or the direction of the velocity. Instantaneous acceleration a is the acceleration at a specific instant in time. Deceleration is an acceleration with a direction opposite to that of t... | D: direction. |
What is it called when individual organisms work together with one another?
Here are the choices:
A. dualism
B. continuation
C. cooperation
D. competition | Bees and other social animals must cooperate to live together successfully. Cooperation means working together with others. Members of the group may cooperate by dividing up tasks, defending each other, and sharing food. The ants in Figure below are sharing food. One ant is transferring food directly from its mouth to ... | C: cooperation. |
How thick is the earth's continental crust, on average?
Here are the choices:
A. 60 kilometers
B. 35 kilometers
C. 15 kilometers
D. 25 kilometers | Continental crust is much thicker than oceanic crust. It is 35 kilometers (22 miles) thick on average, but it varies a lot. Continental crust is made up of many different rocks. All three major rock types — igneous, metamorphic, and sedimentary — are found in the crust. On average, continental crust is much less dense ... | B: 35 kilometers. |
Which organ has a thick mucus lining that protects the underlying tissue from the action of the digestive juices?
Here are the choices:
A. colon
B. spleen
C. stomach
D. liver | functionality of pepsin. Second, the stomach has a thick mucus lining that protects the underlying tissue from the action of the digestive juices. When this mucus lining is ruptured, ulcers can form in the stomach. Ulcers are open wounds in or on an organ caused by bacteria (Helicobacter pylori) when the mucus lining i... | C: stomach. |
What historical event taught people that soil could be lost by plowing and growing crops and encouraged new methods to prevent erosion?
Here are the choices:
A. the debris bowl
B. the land bowl
C. the flow bowl
D. the dust bowl | The Dust Bowl taught people that soil could be lost by plowing and growing crops. This led to the development of new ways of farming that help protect the soil. Some of the methods are described in Figure below . | D: the dust bowl. |
In what phase is the moon brightly illuminated?
Here are the choices:
A. new moon
B. blue moon
C. crescent
D. full moon | The Earth, Moon and Sun are linked together in space. Monthly or daily cycles continually remind us of these links. Every month, you can see the Moon change. This is due to where it is relative to the Sun and Earth. In one phase, the Moon is brightly illuminated - a full moon. In the opposite phase it is completely dar... | D: full moon. |
What do vectors possess that scalars do not?
Here are the choices:
A. magnitude and direction
B. magnitude and weight
C. direction and texture
D. height and polarity | In physics, a quantity, such as mass, length, or speed that is completely specified by its magnitude and has no direction is called a scalar . A vector , on the other hand, is a quantity possessing both magnitude and direction. A vector quantity is typically represented by an arrow-tipped line segment. The length of th... | A: magnitude and direction. |
What are the food making factories of plants?
Here are the choices:
A. fruits
B. leaves
C. stems
D. roots | B: leaves. | |
What does a pollinator pick from its body and carry directly to another plant of the same species?
Here are the choices:
A. egg
B. pathogen
C. spore
D. pollen | Wind-blown pollen might land anywhere and be wasted. Another adaptation solved this problem. Plants evolved traits that attract specific animal pollinators . Like the bee in Figure below , a pollinator picks up pollen on its body and carries it directly to another plant of the same species. This greatly increases the c... | D: pollen. |
Melting ice cubes and freezing water are examples of change of what?
Here are the choices:
A. state
B. volume
C. role
D. role | A: The paper is being cut into smaller pieces, which is changing its size and shape. The ice cubes are turning into a puddle of liquid water because they are melting. This is a change of state. The tablet is disappearing in the glass of water because it is dissolving into particles that are too small to see. The lighth... | A: state. |
What is the term for heterotrophs that eat only or mainly animals?
Here are the choices:
A. omnivores
B. carnivores
C. parasites
D. predators | All reptiles are heterotrophs, and the majority eats other animals. Heterotrophs that eat only or mainly animals are called carnivores. Large carnivorous reptiles such as crocodilians are the top predators in their ecosystems. They prey on large birds, fish, deer, turtles, and sometimes farm livestock. Their powerful j... | B: carnivores. |
How much work is done when a force is applied in a different direction than the direction of movement?
Here are the choices:
A. none
B. minimum
C. half
D. full | Laura Guerin. Work is not done when a force is applied in a different direction than the direction of movement . CC BY-NC 3.0. | A: none. |
The mercury or alcohol in a common glass what changes its volume as the temperature changes?
Here are the choices:
A. barometer
B. thermometer
C. compass
D. calculator | Conversion of Temperature Units We use the word temperature to refer to the hotness or coldness of a substance. One way we measure a change in temperature is to use the fact that most substances expand when their temperature increases and contract when their temperature decreases. The mercury or alcohol in a common gla... | B: thermometer. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.