questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
Which muscles allow your fingers to also make precise movements for actions?
Here are the choices:
A. fine movement muscles
B. motoric muscles
C. paired muscles
D. intrinsic muscles | Intrinsic Muscles of the Hand The intrinsic muscles of the hand both originate and insert within it (Figure 11.28). These muscles allow your fingers to also make precise movements for actions, such as typing or writing. These muscles are divided into three groups. The thenar muscles are on the radial aspect of the palm... | D: intrinsic muscles. |
Testing what usually requires making observations or performing experiments?
Here are the choices:
A. variables
B. conclusion
C. hypothesis
D. homeostasis | Usually, testing a hypothesis requires making observations or performing experiments. In this case, we will look into existing scientific literature to see if either of these hypotheses can be disproved, or if one or both can be supported by the data. | C: hypothesis. |
This sharing of electrons produces what is known as a covalent bond. covalent bonds are ~20 to 50 times stronger than what?
Here are the choices:
A. Mendelian systems
B. gravitational pull
C. Newton's third law
D. van der waals interactions | any other electron, they become a part of the molecule’s electron system.204 This sharing of electrons produces what is known as a covalent bond. Covalent bonds are ~20 to 50 times stronger than van der Waals interactions. What exactly does that mean? Basically, it takes 20 to 50 times more energy to break a covalent b... | D: van der waals interactions. |
Water molecules move about continuously due to what type of energy?
Here are the choices:
A. seismic
B. optical
C. potential
D. kinetic | Water molecules move about continuously due to their kinetic energy. When a crystal of sodium chloride is placed into water, the water’s molecules collide with the crystal lattice. Recall that the crystal lattice is composed of alternating positive and negative ions. Water is attracted to the sodium chloride crystal be... | D: kinetic. |
A small scale version of what type of map displays individual rock units?
Here are the choices:
A. seismic map
B. polar map
C. geologic map
D. geographic map | Geologic maps display rock units and geologic features. A small scale map displays individual rock units while a large scale map shows geologic provinces. | C: geologic map. |
What is defined as a change in the inherited traits of organisms over time?
Here are the choices:
A. divergence
B. evolution
C. generation
D. variation | One idea is that evolution happens. Evolution is a change in the inherited traits of organisms over time. Living things have changed as descendants diverged from common ancestors in the past. | B: evolution. |
What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty?
Here are the choices:
A. steroids
B. epinephrine
C. testosterone
D. estrogen | What causes puberty to begin? The hypothalamus in the brain “tells” the pituitary gland to secrete hormones that target the testes. The main pituitary hormone involved is luteinizing hormone (LH) . It stimulates the testes to secrete testosterone. Testosterone, in turn, promotes protein synthesis and growth. It brings ... | C: testosterone. |
Where do angiosperms produce seeds in flowers?
Here are the choices:
A. cones
B. testes
C. ovaries
D. germs | Seed plants called angiosperms produce seeds in the ovaries of flowers. | C: ovaries. |
In order to create food, what do photosynthetic protists use?
Here are the choices:
A. thermal energy
B. decayed matter
C. light energy
D. hydrocarbons | Photosynthetic protists use light energy to make food. They are major producers in aquatic ecosystems. | C: light energy. |
What type of vertebrates are birds?
Here are the choices:
A. invertebrates
B. epidermal tetrapod
C. exothermic
D. endothermic tetrapod | Birds are endothermic tetrapod vertebrates. They are bipedal, which means they walk on two legs. Birds also lay amniotic eggs, and the eggs have hard, calcium carbonate shells. Although birds are the most recent class of vertebrates to evolve, they are now the most numerous vertebrates on Earth. Why have birds been so ... | D: endothermic tetrapod. |
What type of ions do ionic compounds contain?
Here are the choices:
A. regular and irregular
B. positive and charged
C. positive and negative
D. negative and neutal | An ionic compound contains positive and negative ions. | C: positive and negative. |
All living things need air and this to survive?
Here are the choices:
A. ecosystem
B. stimuli
C. habitat
D. water | D: water. | |
The cells of all eukarya have a what?
Here are the choices:
A. epidermis
B. necrosis
C. chloroplast
D. nucleus | Some Eukarya are also single-celled, but many are multicellular. Some have a cell wall; others do not. However, the cells of all Eukarya have a nucleus and other organelles. | D: nucleus. |
What type of plate boundaries produce huge mountain ranges in the ocean basin?
Here are the choices:
A. parallel
B. coherent
C. divergent
D. tractional | Divergent plate boundaries produce huge mountain ranges under water in every ocean basin. | C: divergent. |
Interstitial carbides are produced by the reaction of most transition metals at high temperatures with what element?
Here are the choices:
A. nitrogen
B. carbon
C. oxygen
D. hydrogen | temperatures with electropositive metals such as those of groups 1 and 2 and aluminum produces ionic carbides, which contain discrete metal cations and carbon anions. The identity of the anions depends on the size of the second element. For example, smaller elements such as beryllium and aluminum give methides such as ... | B: carbon. |
Fungus-like protist saprobes play what role in a food chain and are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes?
Here are the choices:
A. Soil
B. aphids
C. decomposers
D. fluxes | Agents of Decomposition The fungus-like protist saprobes are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes. For instance, many types of oomycetes grow on dead animals or algae. Saprobic protists have the essential function of returning inorganic nutrients to the s... | C: decomposers. |
What are the sites of protein synthesis or assembly?
Here are the choices:
A. ribosomes
B. chromosomes
C. plasma
D. chloroplasts | Ribosomes are small organelles and are the sites of protein synthesis (or assembly). They are made of ribosomal protein and ribosomal RNA, and are found in both eukaryotic and prokaryotic cells. Unlike other organelles, ribosomes are not surrounded by a membrane. Each ribosome has two parts, a large and a small subunit... | A: ribosomes. |
What must replicate in the cell cycle before meiosis i takes place?
Here are the choices:
A. meiotic fluid
B. dna
C. cell walls
D. sperm | Meiosis I begins after DNA replicates during interphase of the cell cycle. In both meiosis I and meiosis II , cells go through the same four phases as mitosis - prophase, metaphase, anaphase and telophase. However, there are important differences between meiosis I and mitosis. The eight stages of meiosis are summarized... | B: dna. |
What phenomenon is primarily the result of plate tectonic motions?
Here are the choices:
A. earthquake
B. eruption
C. volcanoes
D. tsunamis | Earthquakes are primarily the result of plate tectonic motions. What type of stress would cause earthquakes at each of the three types of plate boundaries?. | A: earthquake. |
What is a group of neuron cell bodies in the periphery called?
Here are the choices:
A. organism
B. crystals
C. gangism
D. ganglion | Ganglia A ganglion is a group of neuron cell bodies in the periphery. Ganglia can be categorized, for the most part, as either sensory ganglia or autonomic ganglia, referring to their primary functions. The most common type of sensory ganglion is a dorsal (posterior) root ganglion. These ganglia are the cell bodies of ... | D: ganglion. |
Where does most of our food come from?
Here are the choices:
A. angiosperms
B. lichen
C. gymnosperms
D. microbes | A: angiosperms. | |
Gases are most ideal at high temperature and what pressure?
Here are the choices:
A. absolute
B. low
C. high
D. stable | Under what conditions then, do gases behave least ideally? When a gas is put under high pressure, its molecules are forced closer together as the empty space between the particles is diminished. A decrease in the empty space means that the assumption that the volume of the particles themselves is negligible is less val... | B: low. |
Hard igneous rocks and easily dissolved sedimentary rocks respond very differently to what natural force?
Here are the choices:
A. gravity
B. sunlight
C. evaporation
D. weathering | Each type of rock weathers in its own way. Certain types of rock are very resistant to weathering. Igneous rocks tend to weather slowly because they are hard. Water cannot easily penetrate them. Granite is a very stable igneous rock. Other types of rock are easily weathered because they dissolve easily in weak acids. L... | D: weathering. |
A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures?
Here are the choices:
A. vitamin d
B. niacin
C. vitamin C
D. vitamin A | Skeletal system problems include osteoporosis, bone fractures, and ligament sprains. A diet rick in calcium and vitamin D may reduce the risk of osteoporosis and related bone fractures. Following safe practices may also reduce the risk of fractures as well as sprains. | A: vitamin d. |
How many people die from air pollution each year?
Here are the choices:
A. 14 million
B. 22 million
C. 5 million
D. 17 million | Air pollution is harmful to human beings and other living things. About 22 million people die from air pollution each year. Breathing polluted air increases the risk of developing lung diseases such as asthma and lung cancer. Breathing bad air also increases the chances of dying from other diseases. Children are most l... | B: 22 million. |
What substances serve as catalysts in most of the biochemical reactions that take place in organisms?
Here are the choices:
A. hormones
B. carbohydrates
C. iseotrops
D. enzymes | Enzymes are involved in most of the biochemical reactions that take place in organisms. About 4,000 such reactions are known to be catalyzed by enzymes, but the number may be even higher. Enzymes allow reactions to occur at the rate necessary for life. | D: enzymes. |
The formation of an amalgam allows the metal to react with what?
Here are the choices:
A. cloth and plastic
B. blood and sweat
C. helium and oxygen
D. air and water | The metals of group 13 (Al, Ga, In, and Tl) are all reactive. However, passivation occurs as a tough, hard, thin film of the metal oxide forms upon exposure to air. Disruption of this film may counter the passivation, allowing the metal to react. One way to disrupt the film is to expose the passivated metal to mercury.... | D: air and water. |
A pulley changes the direction of the force t exerted by the cord without changing its what?
Here are the choices:
A. magnitude
B. position
C. latitude
D. longitude | automobile axle drives a wheel, which has a much larger diameter than the axle. The MA is less than 1. (c) An ordinary pulley is used to lift a heavy load. The pulley changes the direction of the force T exerted by the cord without changing its magnitude. Hence, this machine has an MA of 1. | A: magnitude. |
What is the name of the small bumps that contain taste buds and covers the tongue?
Here are the choices:
A. lingual tonsils
B. palatine tonsils
C. cuticle
D. papillae | Figure 14.3 The Tongue The tongue is covered with small bumps, called papillae, which contain taste buds that are sensitive to chemicals in ingested food or drink. Different types of papillae are found in different regions of the tongue. The taste buds contain specialized gustatory receptor cells that respond to chemic... | D: papillae. |
In the absence of air resistance, all falling objects accelerate at the same rate due to what force?
Here are the choices:
A. velocity
B. motion
C. weight
D. gravity | What if you were to drop a bowling ball and a soccer ball at the same time from the same distance above the ground? The bowling ball has greater mass than the basketball, so the pull of gravity on it is greater. Would it fall to the ground faster? No, the bowling ball and basketball would reach the ground at the same t... | D: gravity. |
The ability for a plasma membrane to only allow certain molecules in or out of the cell is referred to as what?
Here are the choices:
A. selective permeability
B. total permeability
C. periodic permeability
D. moderate permeability | The plasma membrane forms a barrier between the cytoplasm inside the cell and the environment outside the cell. It protects and supports the cell and also controls everything that enters and leaves the cell. It allows only certain substances to pass through, while keeping others in or out. The ability to allow only cer... | A: selective permeability. |
In the presence of oxygen, hydrogen can interact to make what?
Here are the choices:
A. carbon
B. helium
C. water
D. acid | A pile of leaves slowly rots in the backyard. In the presence of oxygen, hydrogen can interact to make water. Gold can be stretched into very thin wires. | C: water. |
What galaxy is our solar system a part of?
Here are the choices:
A. Centaurus
B. Bode's Galaxy
C. Andromeda
D. milky way | Compared to Earth, the solar system is a big place. But galaxies are bigger - a lot bigger. A galaxy is a very large group of stars held together by gravity. How enormous a galaxy is and how many stars it contains are impossible for us to really understand. A galaxy contains up to a few billion stars! Our solar system ... | D: milky way. |
The angle at which light bends when it enters a different medium is known as what?
Here are the choices:
A. resonance
B. refraction
C. frequency
D. bounce | The angle at which light bends when it enters a different medium depends on its change in speed. The greater the change in speed, the greater the angle of refraction is. For example, light refracts more when it passes from air to diamond than it does when it passes from air to water. That’s because the speed of light i... | B: refraction. |
Whether the organism is a bacterium, plant, or animal, all living things access energy by breaking down these?
Here are the choices:
A. protein molecules
B. lipid molecules
C. carbohydrate molecules
D. oxygen molecules | The Energy Cycle Whether the organism is a bacterium, plant, or animal, all living things access energy by breaking down carbohydrate molecules. But if plants make carbohydrate molecules, why would they need to break them down, especially when it has been shown that the gas organisms release as a “waste product” (CO2) ... | C: carbohydrate molecules. |
Increasing the temperature of n2 molecules increases what energy of motion?
Here are the choices:
A. kinetic energy
B. emotional energy
C. residual energy
D. compression energy | Increasing the temperature increases the average kinetic energy of the N2molecules. | A: kinetic energy. |
Which radio frequency should you listen to if you want less noise?
Here are the choices:
A. cb
B. wave
C. fm
D. am | FM radio is inherently less subject to noise from stray radio sources than AM radio. The reason is that amplitudes of waves add. So an AM receiver would interpret noise added onto the amplitude of its carrier wave as part of the information. An FM receiver can be made to reject amplitudes other than that of the basic c... | C: fm. |
What form of radiation is the energy emitted by the sun?
Here are the choices:
A. electromagnetic
B. seismic
C. thermal
D. magnetic | Figure 8.11 The sun emits energy in the form of electromagnetic radiation. This radiation exists at different wavelengths, each of which has its own characteristic energy. All electromagnetic radiation, including visible light, is characterized by its wavelength. | A: electromagnetic. |
What is the suns innermost layer called?
Here are the choices:
A. core
B. flare
C. surface
D. solar | The core is the Sun's innermost layer. The core is plasma. It has a temperature of around 15 million degrees Celsius (C). Nuclear fusion reactions create the immense temperature. In these reactions, hydrogen atoms fuse to form helium. This releases vast amounts of energy. The energy moves towards the outer layers of th... | A: core. |
A growth spurt requires constant divisions of what?
Here are the choices:
A. seeds
B. proteins
C. cells
D. hairs | To grow and develop, you must form new cells. Imagine how often your cells must divide during a growth spurt. Growing just an inch requires countless cell divisions. Your body must produce new bone cells, new skin cells, new cells in your blood vessels and so on. | C: cells. |
What's the term for the gradual progression from simple plants to larger more complex ones in an area?
Here are the choices:
A. complex progression
B. primary pattern
C. pattern progression
D. primary succession | The pioneer species is soon replaced by other populations. Abiotic factors such as soil quality, water, and climate will determine the species that continue the process of succession. Mosses and grasses will be able to grow in the newly created soil. During early succession, plant species like grasses that grow and rep... | D: primary succession. |
Fungi may form mutualistic relationships with plants, algae, cyanobacteria, and what?
Here are the choices:
A. animals
B. farmers
C. plants
D. eggs | A: animals. | |
Which cycle tracks the flow of nitrogen through an ecosystem?
Here are the choices:
A. life cycle
B. nitrogen reaction
C. water cycle
D. nitrogen cycle | Mariana Ruiz Villarreal (LadyofHats) for CK-12 Foundation. The nitrogen cycle tracks the flow of nitrogen through an ecosystem . CC BY-NC 3.0. | D: nitrogen cycle. |
What consequence of a tornado is responsible for most injuries and deaths?
Here are the choices:
A. catching debris
B. flying debris
C. falling debris
D. touring debris | A tornado only strikes a small area. But it can destroy everything in its path. Most injuries and deaths from tornadoes are caused by flying debris ( Figure below ). In the United States, an average of 90 people are killed by tornadoes each year. The most violent two percent of tornadoes account for 70% of the deaths b... | B: flying debris. |
What are the only truly innate behaviors in humans called?
Here are the choices:
A. feats
B. flinches
C. reflexes
D. automatic movements | All animals have innate behaviors, even human beings. Can you think of human behaviors that do not have to be learned? Chances are, you will have a hard time thinking of any. The only truly innate behaviors in humans are called reflex behaviors . They occur mainly in babies. Like innate behaviors in other animals, refl... | C: reflexes. |
What happens to the density of air as the altitude decreases?
Here are the choices:
A. remains the same
B. multiplies
C. decreases
D. increases | The pressure of the earth’s atmosphere, as with any fluid, increases with the height of the column of air. In the case of earth’s atmosphere, there are some complications. The density of the air is not uniform but decreases with altitude. Additionally there is no distinct top surface from which height can be measured. ... | C: decreases. |
How do some animals change their depth?
Here are the choices:
A. spontaneous mutations
B. mass migration
C. by changing their density
D. metamorphosis | Some animals change their depth by changing their density. Recall that things that are denser than their surroundings sink while those that are less dense than their surroundings float. Most fish have a swim bladder, a special sac that is filled with gases from their blood. When the fish's swim bladder is full, it is l... | C: by changing their density. |
What phenomenon is crowding out other species and making all the other causes of extinction worse?
Here are the choices:
A. human overpopulation
B. migration
C. human suburbanization
D. climate change | Human overpopulation, which is crowding out other species. It also makes all the other causes of extinction worse. | A: human overpopulation. |
Dessication is an extreme and usually fatal form of what in animals?
Here are the choices:
A. depletion
B. dehydration
C. diarrhea
D. starvation | B: dehydration. | |
Internal and external forms of what life process occur as simple diffusion due to a partial pressure gradient?
Here are the choices:
A. metabolism
B. respiration
C. photosynthesis
D. reproduction | Internal Respiration Internal respiration is gas exchange that occurs at the level of body tissues (Figure 22.23). Similar to external respiration, internal respiration also occurs as simple diffusion due to a partial pressure gradient. However, the partial pressure gradients are opposite of those present at the respir... | B: respiration. |
The fossil record shows that this type of event is followed by the evolution of new species to fill the habitats where old species lived?
Here are the choices:
A. moderate extinction
B. minor extinction
C. mass extinction
D. formation extinction | After each mass extinction, new species evolve to fill the habitats where old species lived. This is well documented in the fossil record. | C: mass extinction. |
Soluble minerals and clays accumulate in what soil layer, allowing it to hold more water?
Here are the choices:
A. subsurface
B. subsoil
C. silt
D. topsoil | Below the topsoil is the “B” horizon. This is also called the subsoil . Soluble minerals and clays accumulate in the subsoil. Because it has less organic material, this layer is lighter brown in color than topsoil. It also holds more water due to the presence of iron and clay. There is less organic material in this lay... | B: subsoil. |
What is the common word for potential difference in a circuit?
Here are the choices:
A. watt
B. velocity
C. voltage
D. frequency | Conceptual Questions 19.1 Electric Potential Energy: Potential Difference 1. Voltage is the common word for potential difference. Which term is more descriptive, voltage or potential difference? 2. If the voltage between two points is zero, can a test charge be moved between them with zero net work being done? Can this... | C: voltage. |
How many chambers does the stomach of a crocodile have?
Here are the choices:
A. three
B. six
C. ten
D. two | The crocodilian digestive system is highly adapted to their lifestyle. Crocodilians are known to swallow stones, known as gastroliths , which help digest their prey. The crocodilian stomach is divided into two chambers. The first is powerful and muscular. The other stomach is the most acidic digestive system of any ani... | D: two. |
When populations get close to the carrying capacity, what happens to growth?
Here are the choices:
A. spikes
B. dies
C. slows
D. halts | Populations usually grow bigger when they have what they need. How fast they grow depends on birth and death rates. They grow more slowly as they get close to the carrying capacity. This is the biggest population the environment can support. | C: slows. |
Although air can transfer heat rapidly by convection, it is a poor conductor and thus a good what?
Here are the choices:
A. magnet
B. transporter
C. absorber
D. insulator | Although air can transfer heat rapidly by convection, it is a poor conductor and thus a good insulator. The amount of available space for airflow determines whether air acts as an insulator or conductor. The space between the inside and outside walls of a house, for example, is about 9 cm (3.5 in) —large enough for con... | D: insulator. |
Most plants grow continuously, except for what periods?
Here are the choices:
A. winter
B. abnormal
C. dormant
D. mutant | C: dormant. | |
What man-made devices in space are used to observe the earth's surface?
Here are the choices:
A. crystals
B. satellites
C. telescopes
D. sensors | Observations can happen on many scales. You can use a microscope to observe tiny things. You can use a telescope to observe distant things in space. To learn about the effects of climate change, you could observe Earth's surface. How would you make observations of Earth's surface? You could do this from the land surfac... | B: satellites. |
Carboxylic acids are weak acids, meaning they are not 100% ionized in what?
Here are the choices:
A. liquid
B. ethanol
C. air
D. water | Carboxylic acids are weak acids (see the chapter on acids and bases), meaning they are not 100% ionized in water. Generally only about 1% of the molecules of a carboxylic acid dissolved in water are ionized at any given time. The remaining molecules are undissociated in solution. We prepare carboxylic acids by the oxid... | D: water. |
An endocrine disease usually involves the secretion of too much or not enough of what?
Here are the choices:
A. hormone
B. sweat
C. metabolite
D. enzyme | Diseases of the endocrine system are relatively common. An endocrine disease usually involves the secretion of too much or not enough hormone. When too much hormone is secreted, it is called hypersecretion. When not enough hormone is secreted, it is called hyposecretion. | A: hormone. |
In experiments with garden peas, austrian monk gregor mendel described the basic patterns of what?
Here are the choices:
A. behavior
B. preference
C. inheritance
D. color | For thousands of years, humans have understood that characteristics such as eye color, hair color, or even flower color are passed from one generation to the next. The passing of characteristics from parent to offspring is called heredity . Humans have long been interested in understanding heredity. Many hereditary mec... | C: inheritance. |
Nutrition and diet affect your metabolism. more energy is required to break down fats and proteins than this?
Here are the choices:
A. carbohydrates
B. minerals
C. vitamins
D. electrolytes | 24.7 Nutrition and Diet Nutrition and diet affect your metabolism. More energy is required to break down fats and proteins than carbohydrates; however, all excess calories that are ingested will be stored as fat in the body. On average, a person requires 1500 to 2000 calories for normal daily activity, although routine... | A: carbohydrates. |
What are unsaturated hydrocarbons with at least one double bond between carbon atoms called?
Here are the choices:
A. enzymes
B. amines
C. alkenes
D. peptides | Alkenes are unsaturated hydrocarbons with at least one double bond between carbon atoms. | C: alkenes. |
What is the opposite of melting?
Here are the choices:
A. compression
B. freezing
C. evaporation
D. liquidation | All of the changes of state that occur between solid, liquid and gas are summarized in the diagram in the figure below. Freezing is the opposite of melting and both represent the equilibrium between the solid and liquid states. Evaporation occurs when a liquid turns to a gas. Condensation is the opposite of vaporizatio... | B: freezing. |
A unique characteristic of mammals is the ability to chew, this happens by the temporalis and the masseter allowing what?
Here are the choices:
A. side-to-side movement
B. Grinding
C. Up and down
D. Bakward and forward | The adductor muscle that closes the jaw is composed of two muscles in mammals: the temporalis and the masseter. These allow side-to-side movement of the jaw, making chewing possible, which is unique to mammals. Most mammals have heterodont teeth, meaning that they have different types and shapes of teeth rather than ju... | A: side-to-side movement. |
Most of the pathogens that cause stis enter the body through mucous membranes of which organs?
Here are the choices:
A. eyes
B. reproductive organs
C. stomach
D. kidneys | Most of the pathogens that cause STIs enter the body through mucous membranes of the reproductive organs. All sexual behaviors that involve contact between mucous membranes put a person at risk for infection. This includes vaginal, anal, and oral sexual behaviors. Many STIs can also be transmitted through body fluids s... | B: reproductive organs. |
The activation of what kind of buds induces branching?
Here are the choices:
A. axillary buds
B. arterial buds
C. leafy buds
D. lymphatic buds | A: axillary buds. | |
Sexual reproduction involves haploid gametes and produces a diploid zygote through what process?
Here are the choices:
A. sedimentation
B. infection
C. fertilization
D. vivisection | Sexual reproduction involves haploid gametes and produces a diploid zygote through fertilization. | C: fertilization. |
All alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes all have a formula of cnh2n+2. the number of carbon atoms present in an alkane has what?
Here are the choices:
A. such limit
B. no limit
C. done limit
D. crippling limit | All alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes all have a formula of CnH2n+2. The number of carbon atoms present in an alkane has no limit. Greater numbers of atoms in the molecules will lead to stronger intermolecular attractions (dispersion f... | B: no limit. |
What percentage of men suffer from some form of erectile dysfunction by age 40?
Here are the choices:
A. approximately 60 percent
B. approximately 10 percent
C. approximately 40 percent
D. approximately 80 percent | Male Reproductive System Erectile dysfunction (ED) is a condition in which a man has difficulty either initiating or maintaining an erection. The combined prevalence of minimal, moderate, and complete ED is approximately 40 percent in men at age 40, and reaches nearly 70 percent by 70 years of age. In addition to aging... | C: approximately 40 percent. |
What secures together immovable joints and prevents them from moving?
Here are the choices:
A. light cartilage
B. light collagen
C. dense cartilage
D. dense collagen | Immovable joints allow no movement because the bones at these joints are held securely together by dense collagen . The bones of the skull are connected by immovable joints. | D: dense collagen. |
Transform faults are the site of massive what?
Here are the choices:
A. vibrations
B. tornadoes
C. earthquakes
D. storms | Transform faults are the site of massive earthquakes. | C: earthquakes. |
When water goes above and below its freezing point, what rock-breaking phenomenon is common?
Here are the choices:
A. ice wedging
B. ice locking
C. ice inverting
D. ice crushing | Rocks can break apart into smaller pieces in many ways. Ice wedging is common where water goes above and below its freezing point ( Figure below ). This can happen in winter in the mid-latitudes or in colder climates in summer. Ice wedging is common in mountainous regions like the Sierra Nevada pictured above. | A: ice wedging. |
The diatoms are unicellular photosynthetic protists that encase themselves in intricately patterned, glassy cell walls composed of silicon dioxide in a matrix of organic particles. these protists are a component of freshwater and these?
Here are the choices:
A. waste plankton
B. marine plankton
C. land plankton
D. sour... | The diatoms are unicellular photosynthetic protists that encase themselves in intricately patterned, glassy cell walls composed of silicon dioxide in a matrix of organic particles (Figure 23.18). These protists are a component of freshwater and marine plankton. Most species of diatoms reproduce asexually, although some... | B: marine plankton. |
What type of reactions form compounds?
Here are the choices:
A. consumption reactions
B. physical reactions
C. mineral reactions
D. chemical reactions | A compound is a unique substance that forms when two or more elements combine chemically. Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds. A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons. For a video ... | D: chemical reactions. |
Millions of years ago, plants used energy from the sun to form what?
Here are the choices:
A. evolution
B. fossil fuels
C. greenhouse gases
D. carbon compounds | Fossil fuels include coal, oil, and natural gas. Fossil fuels are the greatest energy source for modern society. Millions of years ago, plants used energy from the Sun to form carbon compounds. These compounds were later transformed into coal, oil, or natural gas. Fossil fuels take millions of years to form. For this r... | D: carbon compounds. |
What is the term for the process in which living things with beneficial traits produce more offspring than others do?
Here are the choices:
A. natural process
B. natural variety
C. natural survival
D. natural selection | The other idea is that evolution occurs by natural selection. Natural selection is the process in which living things with beneficial traits produce more offspring than others do. This results in changes in the traits of living things over time. | D: natural selection. |
In a chemical reaction, the amounts of reactants and products will be constant when what state is attained?
Here are the choices:
A. peak
B. saturation
C. equilibrium
D. homogeneity | The amount of reactants and products do not have to be equal. However, after equilibrium is attained, the amounts of reactants and products will be constant. | C: equilibrium. |
What protects a developing flower while it is still a bud?
Here are the choices:
A. shell
B. lobes
C. sepals
D. petals | Sepals protect the developing flower while it is still a bud. Sepals are usually green, which camouflages the bud from possible consumers. | C: sepals. |
What is the term for the force of attraction between things that have a mass?
Here are the choices:
A. weight
B. gravity
C. motion
D. magnetism | Gravity has traditionally been defined as a force of attraction between things that have mass. According to this conception of gravity, anything that has mass, no matter how small, exerts gravity on other matter. Gravity can act between objects that are not even touching. In fact, gravity can act over very long distanc... | B: gravity. |
What are the long, thin protein extensions in most prokaryotic cells called?
Here are the choices:
A. cingulum
B. analyte
C. neutrons
D. flagellum | D: flagellum. | |
Dialysis is a treatment for failure of what organs?
Here are the choices:
A. liver
B. spleen
C. kidneys
D. lungs | Kidney failure may be treated with dialysis. | C: kidneys. |
What preventive measure can protect even young children against diseases such as viral meningitis?
Here are the choices:
A. surgical intervention
B. nutrition
C. malnutrition
D. vaccination | Children as young as 2 years of age can be vaccinated against viral meningitis. | D: vaccination. |
Renal plasma flow equals the blood flow per minute times the what?
Here are the choices:
A. erythrocytes
B. hemoglobin
C. leukocytes
D. hematocrit | Renal plasma flow equals the blood flow per minute times the hematocrit. If a person has a hematocrit of 45, then the renal plasma flow is 55 percent. 1050*0.55 = 578 mL plasma/min. | D: hematocrit. |
What does lattice energy of an ionic solid measure the strength of?
Here are the choices:
A. bonds
B. atoms
C. metals
D. electrons | Lattice energy of an ionic solid is a measure of the strength of bonds in that ionic compound. | A: bonds. |
How many different types of taste can be detected by taste buds?
Here are the choices:
A. three
B. five
C. hundreds
D. two | B: five. | |
What species do humans belong to?
Here are the choices:
A. homo erectus
B. homo sapiens
C. hominids
D. monkeys | Homo sapiens is our species. We originated about 200,000 years ago in Africa. Evidence of a spiritual life appears about 32,000 years ago. The evidence includes stone figurines that probably have religious significance ( Figure below ). | B: homo sapiens. |
Titration is a method to determine what in acids or bases?
Here are the choices:
A. maturation
B. alkalinity
C. glucose
D. concentration | The concentration of an acid or base can be determined by titration. | D: concentration. |
How many different amino acids make up proteins.
Here are the choices:
A. 14
B. 30
C. 25
D. 20 | There are 20 amino acids that make up proteins. With three bases per codon, there are 64 possible codons. This is more than enough to code for the 20 amino acids plus start and stop signals. You can see how to translate the genetic code in Figure below . Start at the center of the chart for the first base of each three... | D: 20. |
What are sores in the lining of the stomach or duodenum that are usually caused by bacterial infections or acidity?
Here are the choices:
A. hernia
B. lesions
C. clots
D. ulcers | Ulcers are sores in the lining of the stomach or duodenum that are usually caused by bacterial infections. They may also be caused by the acidic environment of the stomach. Stomach acids may damage the lining of the stomach. Symptoms typically include abdominal pain and bleeding. You can see how stomach ulcers develop ... | D: ulcers. |
In some species, what has led to the evolution of alternative male mating behavior and morphology?
Here are the choices:
A. similar selection
B. distributive selection
C. sexual process
D. sexual selection | D: sexual selection. | |
What structure is made from dna and protein molecules coiled together?
Here are the choices:
A. atoms
B. bacterium
C. chromosome
D. enzymes | As a cell prepares to divide, its DNA first forms one or more structures called chromosomes. A chromosome consists of DNA and protein molecules coiled into a definite shape. Chromosomes are circular in prokaryotes and rodlike in eukaryotes. You can see an example of a human chromosome in Figure below . The rest of the ... | C: chromosome. |
What renewable energy source converts energy from the sunlight into electricity?
Here are the choices:
A. geothermal energy
B. hydrostatic energy
C. solar energy
D. geophysical energy | Less energy is needed to get renewable energy sources. Solar energy is a good example. Sunlight is everywhere, so no one needs to go out and find it. We don’t have to drill for it or pump it to the surface. We just need to install solar panels like the ones in Figure below and let sunlight strike them. The energy from ... | C: solar energy. |
The radial artery and which artery parallel their namesake bones, giving off smaller branches until they reach the wrist, or carpal region?
Here are the choices:
A. ulnar
B. triceps
C. humerus
D. biceps | Arteries Serving the Upper Limbs As the subclavian artery exits the thorax into the axillary region, it is renamed the axillary artery. Although it does branch and supply blood to the region near the head of the humerus (via the humeral circumflex arteries), the majority of the vessel continues into the upper arm, or b... | A: ulnar. |
The bones of the skull are connected by what type of joints?
Here are the choices:
A. adjustable
B. pivoting
C. immovable
D. semi-mobile | Immovable joints allow no movement because the bones at these joints are held securely together by dense collagen. The bones of the skull are connected by immovable joints. | C: immovable. |
What is the lowest layer of the atmosphere?
Here are the choices:
A. ionosphere
B. chromosphere
C. troposphere
D. lithosphere | The troposphere is the lowest layer of the atmosphere. All of the air you breathe is in the troposphere. All of Earth's weather—wind, rain, snow, heat—is in the troposphere. The troposphere is the lowest and most important layer of the atmosphere!. | C: troposphere. |
What is the name of the type of plant tissue consisting of undifferentiated cells that can continue to divide and differentiate?
Here are the choices:
A. bundle sheth cell
B. cuticle
C. meristem
D. guard cell | The key to continued growth and repair of plant cells is meristem . Meristem is a type of plant tissue consisting of undifferentiated cells that can continue to divide and differentiate. Meristem at the tips of roots and stems allows them to grow in length. This is called primary growth. Meristem within and around vasc... | C: meristem. |
Phosphate-containing ocean sediments form primarily from the bodies of ocean organisms and from their what?
Here are the choices:
A. ancestors
B. blood
C. excretions
D. skeletons | The Phosphorus Cycle Phosphorus is an essential nutrient for living processes; it is a major component of nucleic acids and phospholipids, and, as calcium phosphate, makes up the supportive components of our bones. Phosphorus is often the limiting nutrient (necessary for growth) in aquatic, particularly freshwater, eco... | C: excretions. |
What does erosion do to pieces of broken rock?
Here are the choices:
A. Cancel Them
B. Smooth them
C. lead them
D. moves them | Erosion moves the pieces of broken rock. | D: moves them. |
The passing of traits from parents to offspring is done through what?
Here are the choices:
A. dna
B. blood
C. sperm
D. egg | Genetics is the study of inheritance. Inheritance is the passing of traits from parents to offspring. How are these traits "passed"? Through DNA, which is the genetic material of all organisms. This concept will focus on genetics, inheritance, and DNA. | A: dna. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.