questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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What stages in the life of a cell does the cell cycle include?
Here are the choices:
A. all
B. adult stages
C. both
D. intermediate stages | Cell division is just one stage of the cell cycle. The cell cycle includes all of the stages in the life of a cell. The cell cycle is more complex in eukaryotic than prokaryotic cells. | A: all. |
What do you call the type of molecular signals that include insulin and that help regulate a number of biochemical processes?
Here are the choices:
A. hormones
B. acids
C. enzymes
D. nerves | Hormones – Hormones are molecular signals that help regulate a number of biochemical processes. Single amino acids and short protein chains are very common types of hormones. For example, insulin is a protein hormone that regulates the amount of glucose present in the bloodstream. | A: hormones. |
What type of device uses electromagnetic induction to change the voltage of electric current?
Here are the choices:
A. hot transformer
B. radioactive transformer
C. electronic transformer
D. mechanical transformer | An electric transformer is a device that uses electromagnetic induction to change the voltage of electric current. Electromagnetic induction is the process of generating current with a magnetic field. It occurs when a magnetic field and electric conductor, such as a coil of wire, move relative to one another. A transfo... | C: electronic transformer. |
Mutations cannot be passed on to offspring if they occur in what type of cells?
Here are the choices:
A. blood cells
B. kept cells
C. put cells
D. body cells | Mutations that occur in body cells cannot be passed on to offspring. They are confined to just one cell and its daughter cells. These mutations may have little effect on an organism. | D: body cells. |
What layer high in the atmosphere protects living things from most of the sun’s harmful uv rays?
Here are the choices:
A. troposphere
B. stratosphere
C. ozone layer
D. Mesosphere | Earth’s atmosphere is vital to life. The atmosphere provides the oxygen and carbon dioxide living things need for photosynthesis and respiration. Living things also need the ozone layer high in the atmosphere. Upper level ozone protects them from most of the Sun’s harmful UV rays. | C: ozone layer. |
What occurs over a large area when a rock is buried or compressed?
Here are the choices:
A. cavern system
B. regional metamorphism
C. landslide
D. metamorphic diffusion | Regional metamorphism occurs over a large area when a rock is buried or compressed. | B: regional metamorphism. |
The uterus has an external opening known as what?
Here are the choices:
A. ovaries
B. fallopian tubes
C. cervix
D. vulva | Nervous system Most nematodes possess four longitudinal nerve cords that run along the length of the body in dorsal, ventral, and lateral positions. The ventral nerve cord is better developed than the dorsal or lateral cords. All nerve cords fuse at the anterior end, around the pharynx, to form head ganglia or the “bra... | D: vulva. |
Plants face two types of enemies: herbivores and what else?
Here are the choices:
A. pathogens
B. erosion
C. carnivores
D. water | Defense Responses against Herbivores and Pathogens Plants face two types of enemies: herbivores and pathogens. Herbivores both large and small use plants as food, and actively chew them. Pathogens are agents of disease. These infectious microorganisms, such as fungi, bacteria, and nematodes, live off of the plant and d... | A: pathogens. |
What organism carries out only fermentation or anaerobic respiration?
Here are the choices:
A. aerobicc enzymes
B. metabolites
C. obligate anaerobes
D. aldehydes | C: obligate anaerobes. | |
What are the smallest type of blood vessel?
Here are the choices:
A. arteries
B. varicose veins
C. capillaries
D. spider veins | Further away from the heart, the aorta branches into smaller arteries, which eventually branch into capillaries. Capillaries are the smallest type of blood vessel; they connect very small arteries and veins. Gases and other substances are exchanged between cells and the blood across the very thin walls of capillaries. | C: capillaries. |
What type of behavior is most flexible?
Here are the choices:
A. learned behavior
B. adaptation
C. reflex behavior
D. innate behavior | Just about all human behaviors are learned. Learned behavior is behavior that occurs only after experience or practice. Learned behavior has an advantage over innate behavior : it is more flexible. Learned behavior can be changed if conditions change. For example, you probably know the route from your house to your sch... | A: learned behavior. |
In the water molecule, two of the electron pairs are lone pairs rather than what?
Here are the choices:
A. acid pairs
B. bonding pairs
C. bonding ions
D. ions pairs | The water molecule, like the ammonia and methane molecules, has a tetrahedral domain geometry. In the water molecule, two of the electron pairs are lone pairs rather than bonding pairs. The molecular geometry of the water molecule is referred to as bent . The H-O-H bond angle is 104.5°, which is smaller than the bond a... | B: bonding pairs. |
What are the basic building blocks of the human body?
Here are the choices:
A. vitamins
B. proteins
C. cells
D. minerals | The basic building blocks of the human body are cells. Human cells are organized into tissues, tissues are organized into organs, and organs are organized into organ systems. | C: cells. |
What is the medial bone of the forearm that runs parallel to the radius?
Here are the choices:
A. fibula
B. ulna
C. humerus
D. radius | Ulna The ulna is the medial bone of the forearm. It runs parallel to the radius, which is the lateral bone of the forearm (Figure 8.6). The proximal end of the ulna resembles a crescent wrench with its large, C-shaped trochlear notch. This region articulates with the trochlea of the humerus as part of the elbow joint. ... | B: ulna. |
The animal kingdom can also be divided into two basic groups, what are they?
Here are the choices:
A. mammals and fish
B. aquatic and land
C. invertebrates and vertebrates
D. sponges and vertebrates | The Animal Kingdom is one of four kingdoms in the Eukarya Domain. The Animal Kingdom, in turn, is divided into almost 40 modern phyla. The Animal Kingdom can also be divided into two basic groups: invertebrates and vertebrates. Most animal species are invertebrates, which lack a backbone. | C: invertebrates and vertebrates. |
These microorganisms are abundant in the human digestive track and serve many roles. what are they?
Here are the choices:
A. bacteria
B. tumors
C. pathogens
D. antioxidants | Bacteria provide vital ecosystem services. They are important decomposers. They are also needed for the carbon and nitrogen cycles. There are billions of bacteria inside the human intestines. They help digest food, make vitamins, and play other important roles. Humans also use bacteria in many other ways, including:. | A: bacteria. |
When both objects have a positive charge what will the force be between them?
Here are the choices:
A. repulsive
B. polar
C. attractive
D. expressive | The positive sign of the force indicates the force is repulsive. This makes sense, because both objects have a positive charge. | A: repulsive. |
What are ocean waves mainly caused by?
Here are the choices:
A. tides
B. gravity
C. humidity
D. wind | Ocean waves are energy traveling through water. They are caused mainly by wind blowing over the water. | D: wind. |
What type of archaea live in salty environments?
Here are the choices:
A. arthropods
B. amphibians
C. sporozoans
D. halophiles | Archaea that live in salty environments are known as halophiles. | D: halophiles. |
What can be thought of as the fundamental unit of life?
Here are the choices:
A. ion
B. electron
C. atom
D. cell | It could easily be said that a cell is the fundamental unit of life, the smallest unit capable of life or the structural and functional unit necessary for life. But whatever it is, a cell is necessary for life. The Cell Biology chapter will discuss some of the fundamental properties of the cell, with lessons that inclu... | D: cell. |
What type of organism is a bacteria?
Here are the choices:
A. fungi
B. paramecium
C. single-celled prokaryotic
D. multicellular organism | The single-celled prokaryotic organism otherwise known as bacteria. And all it takes is one to quickly grow, under just the right conditions, into millions and billions. Luckily, we know how to control bacteria when necessary. But bacteria do serve many important purposes. In fact, we could not survive without them. | C: single-celled prokaryotic. |
What chemical element is required for a combustion reaction ?
Here are the choices:
A. carbon
B. oxygen
C. nitrogen
D. helium | A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O 2 as one reactant. The combustion of hydrogen gas produces water vapor. | B: oxygen. |
What do wind turbines turn wind energy into?
Here are the choices:
A. electricy
B. oxygen
C. hydrogen
D. carbon | Wind energy is energy provided by the blowing wind. Wind turbines, like those in Figure above , can turn wind energy into electricity. The wind blows because of differences in heating of Earth’s atmosphere by the sun. There will never be a shortage of wind. | A: electricy. |
A simple sugar such as fructose or glucose is also called a what?
Here are the choices:
A. carbohydrate
B. galactose
C. monosaccharide
D. disaccharide | A monosaccharide is a simple sugar such as fructose or glucose. Fructose is found in fruits, whereas glucose generally results from the digestion of other carbohydrates. Glucose (C 6 H 12 O 6 ) is used for energy by the cells of most organisms, and is a product of photosynthesis. | C: monosaccharide. |
The fossilized skeleton of archaeopteryx looks like that of a dinosaur, but it had what structures modified for flight, a trait associated only with birds among modern animals?
Here are the choices:
A. feathers
B. fingers
C. beaks
D. claws | fossils and birds, specifically in the structure of the hip and wrist bones, as well as the presence of the wishbone, formed by the fusing of the clavicles. One important fossil of an animal intermediate to dinosaurs and birds is Archaeopteryx, which is from the Jurassic period (Figure 29.33). Archaeopteryx is importan... | A: feathers. |
Blood volume increases substantially during pregnancy, so that by childbirth, it exceeds its preconception volume by 30 percent, or approximately what?
Here are the choices:
A. 2-3 liters
B. 3-5 liters
C. 0-1 liters
D. 1-2 liters | Circulatory System Changes Blood volume increases substantially during pregnancy, so that by childbirth, it exceeds its preconception volume by 30 percent, or approximately 1–2 liters. The greater blood volume helps to manage the demands of fetal nourishment and fetal waste removal. In conjunction with increased blood ... | D: 1-2 liters. |
All of the land drained by a river system is called its basin, or what "wet" term?
Here are the choices:
A. watershed
B. river bank
C. wetlands
D. groundwater | All of the land drained by a river system is called its basin, or watershed. One river system’s basin is separated from another river system’s basin by a divide. The divide is created by the highest points between the two river basins. Precipitation that falls within a river basin always flows toward that river. Precip... | A: watershed. |
What does the gizzard in birds contain that allows them to grind food?
Here are the choices:
A. acid
B. teeth
C. bile
D. swallowed stones | The digestive system of birds is unique, with a gizzard that contains swallowed stones for grinding food. Birds do not have teeth. What do you think the stones do? They help them digest their food. Defining characteristics of modern birds also include:. | D: swallowed stones. |
Equal and oppositely directed forces produce what kind of acceleration?
Here are the choices:
A. greater acceleration
B. steady acceleration
C. faster acceleration
D. no acceleration | An object will not change its state of motion (i. e. , accelerate) unless a net force acts on it. Equal and oppositely directed forces do not produce acceleration. | D: no acceleration. |
Organs are groups of what working together?
Here are the choices:
A. bones
B. muscles
C. tissues
D. tendons | C: tissues. | |
Deep water filling a void caused by surface winds blowing water north and south is known as?
Here are the choices:
A. divergence
B. upwelling
C. downwelling
D. surface current | Upwelling also takes place along the Equator. Winds blow the surface water north and south. This leaves a void that deep water can upwell into. The nutrients rise to the surface and support a great deal of life in the equatorial oceans. | B: upwelling. |
What devices do astronomers use to see objects at wavelengths all across the electromagnetic spectrum?
Here are the choices:
A. microscopes
B. telescopes
C. spectrographs
D. levels | Many extremely interesting objects can’t be seen with the unaided eye. Astronomers use telescopes to see objects at wavelengths all across the electromagnetic spectrum. Some very hot stars emit light primarily at ultraviolet wavelengths. There are extremely hot objects that emit X-rays and even gamma rays. Some very co... | B: telescopes. |
What type of winds blow only over a limited area?
Here are the choices:
A. trade
B. periodic
C. Planetary
D. local | Local winds are winds that blow over a limited area. They are influenced by local geography. Nearness to an ocean, lake or mountain range can affect local winds. Some examples are found below. | D: local. |
What is the term for the spacing of individuals within a population?
Here are the choices:
A. suspension
B. population density
C. equilibrium
D. dispersion | Ecologists also study how individuals in a population are spread across an environment. This spacing of individuals within a population is called dispersion . Some species may be clumped or clustered ( Figure below ) in an area. Others may be evenly spaced ( Figure below ). Still others may be spaced randomly within an... | D: dispersion. |
What is the minimum number of pulleys needed for a compound pulley?
Here are the choices:
A. 4
B. 2
C. 1
D. zero | Single pulleys may be fixed or moveable. Compound pulleys consist of two or more pulleys. | B: 2. |
Magnetic force is always perpendicular to what?
Here are the choices:
A. length
B. speed
C. velocity
D. sunlight | So does the magnetic force cause circular motion? Magnetic force is always perpendicular to velocity, so that it does no work on the charged particle. The particle’s kinetic energy and speed thus remain constant. The direction of motion is affected, but not the speed. This is typical of uniform circular motion. The sim... | C: velocity. |
What is the region in the center back of the eye that is responsible for acute vision?
Here are the choices:
A. lens
B. fovea
C. cornea
D. pupil | The fovea is the region in the center back of the eye that is responsible for acute vision. The fovea has a high density of cones. When you bring your gaze to an object to examine it intently in bright light, the eyes orient so that the object’s image falls on the fovea. However, when looking at a star in the night sky... | B: fovea. |
What is it called when a human has an extra autosome?
Here are the choices:
A. mosaicism
B. polysomy
C. trisomy
D. monosomy | Trisomy is a state where humans have an extra autosome. That is, they have three of a particular chromosome instead of two. For example, trisomy 18 results from an extra chromosome 18, resulting in 47 total chromosomes. To identify the chromosome number (including an abnormal number), a sample of cells is removed from ... | C: trisomy. |
Carboxylic acids can form what with alcohols?
Here are the choices:
A. aldehydes
B. ketones
C. lipids
D. esters | Carboxylic acids can form esters with alcohols. | D: esters. |
What are the two types of semiconductors?
Here are the choices:
A. n-type and p-type
B. o-type and p-type
C. a-type and b-type
D. n-type and m-type | Electronic components consist of semiconductors, which are solid crystals consisting mainly of silicon. There are two types of semiconductors, called n-type and p-type. | A: n-type and p-type. |
What is the term for organisms that live in extremely hot environments?
Here are the choices:
A. exothermic
B. thermophobes
C. hydrophylic
D. thermophiles | The thermophiles live in extremely hot environments. For example, they can grow in hot springs, geysers, and near volcanoes. Unlike other organisms, they can thrive in temperatures near 100°C, the boiling point of water!. | D: thermophiles. |
What is a capillary bed that filters blood principally based on particle size?
Here are the choices:
A. vein
B. buds
C. glomerulus
D. plexus | 25.4 Microscopic Anatomy of the Kidney The functional unit of the kidney, the nephron, consists of the renal corpuscle, PCT, loop of Henle, and DCT. Cortical nephrons have short loops of Henle, whereas juxtamedullary nephrons have long loops of Henle extending into the medulla. About 15 percent of nephrons are juxtamed... | C: glomerulus. |
Minerals form when they precipitate from hot fluids that have done what?
Here are the choices:
A. dried out
B. cooled down
C. accelerated down
D. heated up | Minerals form when they precipitate from hot fluids that have cooled down. | B: cooled down. |
Mass spectrometry today is used extensively in chemistry and biology laboratories to identify chemical and biological substances according to their ratios of what?
Here are the choices:
A. mass to volume
B. volume to charge
C. mass-to-charge
D. ph to charge | Mass spectrometry today is used extensively in chemistry and biology laboratories to identify chemical and biological substances according to their mass-to-charge ratios. In medicine, mass spectrometers are used to measure the concentration of isotopes used as tracers. Usually, biological molecules such as proteins are... | C: mass-to-charge. |
What helps treat bacterial infections in people?
Here are the choices:
A. respiratory drugs
B. vaccines
C. rest
D. antibiotic drugs | Bacteria in food or water usually can be killed by heating it to a high temperature. Generally, this temperature is at least 71 °C (160 °F). Bacteria on surfaces such as countertops and floors can be killed with disinfectants, such as chlorine bleach. Bacterial infections in people can be treated with antibiotic drugs ... | D: antibiotic drugs. |
Which has more electrons, neon or fluorine?
Here are the choices:
A. neon
B. neither
C. the same
D. fluorine | Although neon has just one more electron than fluorine in its outer energy level, that one electron makes a huge difference. Fluorine needs one more electron to fill its outer energy level in order to have the most stable arrangement of electrons. Therefore, fluorine readily accepts an electron from any element that is... | A: neon. |
What kind of process occurs naturally under certain conditions, unlike its opposite, which will not take place unless it is “driven” by the continual input of energy from an external source?
Here are the choices:
A. noticeable process
B. activation process
C. spontaneous process
D. controlled process | Spontaneous and Nonspontaneous Processes Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill, but uphill flow requires outside intervention such as the use of a pump. Iron exposed to the earth’s atmosphere will corrode, but rust is not converte... | C: spontaneous process. |
Gradual degradation of a material due to its exposure to the environment is known as what?
Here are the choices:
A. destruction
B. metabolism
C. corrosion
D. erosion | The driving force to combine with nonmetals to create ionic compounds varies quite a bit between different metals. Some pure metals, like cesium and potassium, are so eager to react that they must be stored under oil to avoid an immediate reaction with the oxygen present in air. Others, like platinum and gold, are stab... | C: corrosion. |
What is the name for a matter that has a fixed volume and a fixed shape?
Here are the choices:
A. gas
B. stable
C. liquid
D. solid | Ice is an example of solid matter. A solid is matter that has a fixed volume and a fixed shape. Figure below shows examples of matter that are usually solids under Earth conditions. In the figure, salt and cellulose are examples of crystalline solids. The particles of crystalline solids are arranged in a regular repeat... | D: solid. |
German doctor rudolf virchow first discovered what process when studying living cells under a microscope?
Here are the choices:
A. cell division
B. photosynthesis
C. evolution
D. radiation | Around 1850, a German doctor named Rudolf Virchow was observing living cells under a microscope. As he was watching, one of the cells happened to divide. Figure below shows a cell dividing, like the cell observed by Virchow. This was an “aha” moment for Virchow. He realized that living cells produce new cells by dividi... | A: cell division. |
What was the first mass extinction that occurred on earth?
Here are the choices:
A. proterozoic mass extinction
B. paleozoic mass extinction
C. precambrian mass extinction
D. late Devonian mass extinction | At the end of the Precambrian, a mass extinction occurred. In a mass extinction , the majority of species die out. The Precambrian mass extinction was the first of six mass extinctions that occurred on Earth. It’s not certain what caused this first mass extinction. Changes in Earth’s geology and climate were no doubt i... | C: precambrian mass extinction. |
What type of habitat do ferns need to grow?
Here are the choices:
A. dry
B. elevated
C. cold
D. moist | Ferns 11,000 They have large leaves in fronds. They have stiff stems, so they are tall growing; some are trees. They reproduce with spores. They need a moist habitat. | D: moist. |
G2 and s are phases in what process that is important in cell division?
Here are the choices:
A. cytokinesis
B. mitosis
C. osmosis
D. tissues | DNA and the associated proteins, as well as accumulating enough energy reserves to complete the task of replicating each chromosome in the nucleus. S Phase Throughout interphase, nuclear DNA remains in a semi-condensed chromatin configuration. In the S phase (synthesis phase), DNA replication results in the formation o... | B: mitosis. |
Solar energy travels in what?
Here are the choices:
A. ions
B. photons
C. neurons
D. electrons | Solar energy travels in photons. Photons travel in waves, which make up electromagnetic radiation. | B: photons. |
What type of joint is the knee joint?
Here are the choices:
A. ball joint
B. hinge joint
C. condyloid joint
D. pivot joint | Hinge Joint. The knee joint is a hinge joint. Like a door hinge, a hinge joint allows backward and forward movement. | B: hinge joint. |
What state of matter takes the shape and volume of whatever container it occupies?
Here are the choices:
A. liquid
B. solid
C. gas
D. mixture | C: gas. | |
What is a high concentrated solution typically referred to as?
Here are the choices:
A. saline sollution
B. share solution
C. stock solution
D. percent solution | Another common dilution problem involves deciding how much of a highly concentrated solution is requires to make a desired quantity of solution of lesser concentration. The highly concentrated solution is typically referred to as the stock solution. | C: stock solution. |
The joints that are between the bones that make up the skull are what kind of joints?
Here are the choices:
A. Interphalangeal joints
B. immovable joints
C. Ball and socket joints
D. Gliding ioints | Immovable joints do not allow the bones to move at all. In these joints, the bones are fused together by very tough collagen. Examples of immovable joints include the joints between bones of the skull. You can see them in Figure below . | B: immovable joints. |
What weather phenomenon increases the rate of weathering in rock and soil?
Here are the choices:
A. earthquake
B. temperature
C. rainfall
D. landslide | Rainfall in an area is important because it influences the rate of weathering. More rain means that more rainwater passes through the soil. The rainwater reacts chemically with the particles. The top layers of soil are in contact with the freshest water, so reactions are greatest there. High rainfall increases the amou... | C: rainfall. |
What is pluto now called?
Here are the choices:
A. planet
B. dwarf planet
C. meteor
D. asteroid | If the first three are true but not the fourth, then that object is a dwarf planet . We now call Pluto a dwarf planet. There are other dwarf planets in the solar system. They are Eris, Ceres, Makemake and Haumea. There are many other reasons why Pluto does not fit with the other planets in our solar system. | B: dwarf planet. |
Tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume are all types of what kind of measurement?
Here are the choices:
A. lung volume
B. respiratory volume
C. emitted volume
D. breathing volume | 39.2 Gas Exchange across Respiratory Surfaces The lungs can hold a large volume of air, but they are not usually filled to maximal capacity. Lung volume measurements include tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume. The sum of these equals the total lung capacity. Gas mov... | A: lung volume. |
What kind of a relationship do plants and soil have?
Here are the choices:
A. two-way relationship
B. one-way relationship
C. contentious relationship
D. dimorphic relationship | A: two-way relationship. | |
What is the process of generating electric current with a magnetic field?
Here are the choices:
A. mechanical induction
B. electromagnetic induction
C. molecular induction
D. pole induction | An electric generator is a device that produces electricity through electromagnetic induction. Electromagnetic induction is the process of generating electric current with a magnetic field. | B: electromagnetic induction. |
The adrenal cortex directly influences the function of what organs through the production of the hormone aldosterone to stimulate sodium reabsorption?
Here are the choices:
A. kidneys
B. tumors
C. lungs
D. heart | On the superior aspect of each kidney is the adrenal gland. The adrenal cortex directly influences renal function through the production of the hormone aldosterone to stimulate sodium reabsorption. | A: kidneys. |
What type of direction does a phase change depend on?
Here are the choices:
A. weight transfer
B. humidity transfer
C. power transfer
D. heat transfer | Remember that a phase change depends on the direction of the heat transfer. If heat transfers in, solids become liquids, and liquids become solids at the melting and boiling points, respectively. If heat transfers out, liquids solidify, and gases condense into liquids. | D: heat transfer. |
The strength of what depends on the concentration of hydrogen ions it produces when dissolved in water?
Here are the choices:
A. the base
B. electricity
C. the solution
D. acid | The strength of an acid depends on the concentration of hydrogen ions it produces when dissolved in water. A stronger acid produces a greater concentration of ions than a weaker acid. For example, when hydrogen chloride is added to water, all of it breaks down into H + and Cl - ions. Therefore, it is a strong acid. On ... | D: acid. |
What are the largest phylum in the animal kingdom?
Here are the choices:
A. arthropods
B. crustaceans
C. mammals
D. cephalopods | Arthropods are the largest phylum in the animal kingdom. | A: arthropods. |
What kind of organisms are yeasts?
Here are the choices:
A. viruses
B. single-celled
C. protozoa
D. bacteria | The aim of basic science is to discover new knowledge. It leads to a better understanding of the natural world. It doesn’t necessarily have any practical use. An example of basic research in life science is studying how yeast cells grow and divide. Yeasts are single-celled organisms that are easy to study. By studying ... | B: single-celled. |
What kind of bond consists of one sigma bond and one pi bond?
Here are the choices:
A. ionic bond
B. beta bond
C. double bond
D. covalent bond | Recall that a double bond consists of one sigma bond and one pi bond. In order for a double bond to be formed, each participating carbon atom must have at least one unhybridized p orbital. In a carbon-carbon double bond where both carbons are bonded to two additional atoms, each carbon is sp 2 hybridized. The double bo... | C: double bond. |
What is the purpose of utilizing careful farming practices such as rotating crops or planting nutrient rich crops?
Here are the choices:
A. improve soil texture
B. improve soil quality
C. improve sediment quality
D. improve photosynthesis quality | Careful farming helps to keep up soil quality each season. One way is to plant different crops each year. Another is to alternate the crops planted in each row of the field. These techniques preserve and replenish soil nutrients. Planting nutrient rich cover crops helps the soil. Planting trees as windbreaks, plowing a... | B: improve soil quality. |
What do communication satellites carry and use to provide energy during their missions?
Here are the choices:
A. geothermal panels
B. solar panels
C. infrared panels
D. batteries | Communications satellites carry solar panels to provide energy for their missions. | B: solar panels. |
What is the biogeochemical cycle that recycles water called?
Here are the choices:
A. water theory
B. Liquid Cycle
C. water cycle
D. Water Table | The biogeochemical cycle that recycles water is the water cycle. The water cycle involves a series of interconnected pathways involving both the biotic and abiotic components of the biosphere. Water is obviously an extremely important aspect of every ecosystem. Life cannot exist without water. Many organisms contain a ... | C: water cycle. |
What type of behavior is frogs croaking or deer clashing antlers an example of?
Here are the choices:
A. mating
B. learned behavior
C. instincts
D. courtship | Courtship behaviors occur in many other species. For example, males in some species of whales have special mating songs to attract females as mates. Frogs croak for the same reason. Male deer clash antlers to court females. Male jumping spiders jump from side to side to attract mates. | D: courtship. |
An atom can be classified as a particular element based solely on its what?
Here are the choices:
A. light number
B. spectrum
C. ability
D. atomic number | The atomic number of an element is the number of protons in the nucleus of each atom of that element. An atom can be classified as a particular element based solely on its atomic number. For example, any atom with an atomic number of 8 (its nucleus contains 8 protons) is an oxygen atom, and any atom with a different nu... | D: atomic number. |
In the body, what essential substance is pumped from the heart into arteries and then eventually into capillaries?
Here are the choices:
A. spinal fluid
B. lymphatic Fluid
C. blood
D. water | The solution to the last part of the example shows that speed is inversely proportional to the square of the radius of the tube, making for large effects when radius varies. We can blow out a candle at quite a distance, for example, by pursing our lips, whereas blowing on a candle with our mouth wide open is quite inef... | C: blood. |
What (nh3) is one of the few thermodynamically stable binary compounds of nitrogen with a nonmetal?
Here are the choices:
A. liquid nitrogen
B. ammonia
C. acetic acid
D. nitrous oxide | Note the Pattern Few binary molecular compounds of nitrogen are formed by the direct reaction of the elements. At elevated temperatures, nitrogen reacts with highly electropositive metals to formionic nitrides, such as Li3N and Ca3N2. These compounds consist of ionic lattices formed by M n+ and N3− ions. Just as boron ... | B: ammonia. |
What does increased temperature cause the volume to do in a gas?
Here are the choices:
A. decrease
B. increase
C. halve
D. disappear | Equal volumes of four different gases at the same temperature and pressure contain the same number of gaseous particles. Because the molar mass of each gas is different, the mass of each gas sample is different even though all contain 1 mol of gas. The relationships among the volume of a gas and its pressure, temperatu... | B: increase. |
Which effect causes winds to strike the polar front at an angle?
Here are the choices:
A. coriolis effect
B. centrifugal effect
C. axial tilt
D. Lake Effect | Mid-latitude cyclones form at the polar front. Two very different air masses blow past each other in opposite directions. The Coriolis effect causes winds to strike the polar front at an angle. Warm and cold fronts form next to each other. | A: coriolis effect. |
Birds evolved from what type of ancestor?
Here are the choices:
A. apes
B. reptile
C. insect
D. fish | Birds evolved from a reptile ancestor, but modern birds and reptiles are very different. Birds are now the most numerous four-limbed reptiles on Earth. | B: reptile. |
Which blood cells serve to defend the body in various ways?
Here are the choices:
A. blue blood cells
B. white blood cells
C. helper blood cells
D. red blood cells | White blood cells are larger than red blood cells, but there are far fewer of them. Their role is to defend the body in various ways. For example, white blood cells called phagocytes engulf and destroy microorganisms and debris in the blood. | B: white blood cells. |
Eutherian mammals possess a specialized structure called the corpus callosum that links what hemispheres?
Here are the choices:
A. appendages
B. spatial
C. cortical
D. cerebral | possess a single, undivided lobe. Eutherian mammals also possess a specialized structure that links the two cerebral hemispheres, called the corpus callosum. | D: cerebral. |
Which part of the brain secretes hormones that tell the pituitary gland either to secrete or to stop secreting its hormones?
Here are the choices:
A. hippocampus
B. cerebrum
C. thalamus
D. hypothalamus | The hypothalamus is actually part of the brain (see Figure below ), but it also secretes hormones . Some of its hormones “tell” the pituitary gland either to secrete or to stop secreting its hormones. In this way, the hypothalamus provides a link between the nervous and endocrine systems. The hypothalamus also produces... | D: hypothalamus. |
Most reptile eggs can be laid on land, not in water and they are called what?
Here are the choices:
A. umbilical
B. amniotic
C. aqueous
D. Transitional | Most reptiles reproduce sexually and have internal fertilization. Their eggs are amniotic, so they can be laid on land instead of in water. Reptiles do not have a larval stage, and their hatchlings are relatively mature. Reptile parents provide little if any care to their young. | B: amniotic. |
What do you call a small whole number placed in front of a formula in an equation in order to balance it?
Here are the choices:
A. divisible
B. function
C. correlation
D. coefficient | A coefficient is a small whole number placed in front of a formula in an equation in order to balance it. The 2 in front of the H 2 means that there are a total of atoms of hydrogen as reactants. Visually, the reaction looks like the Figure below . | D: coefficient. |
Because the earth is covered with vegetation, cellulose is the most abundant of all what?
Here are the choices:
A. carbohydrates
B. impurities
C. vegetables
D. rocks | Cellulose Cellulose, a fibrous carbohydrate found in all plants, is the structural component of plant cell walls. Because the earth is covered with vegetation, cellulose is the most abundant of all carbohydrates, accounting for over 50% of all the carbon found in the vegetable kingdom. Cotton fibrils and filter paper a... | A: carbohydrates. |
The energy of a photon is directly proportional to the frequency of the electromagnetic what?
Here are the choices:
A. absorption
B. convection
C. evaporation
D. radiation | The energy of a photon is directly proportional to the frequency of the electromagnetic radiation. | D: radiation. |
What term means the amount of space matter takes up?
Here are the choices:
A. weight
B. volume
C. density
D. mass | The amount of space matter takes up is its volume . How the volume of matter is measured depends on its state. | B: volume. |
All of the stages that a cell goes through make up what?
Here are the choices:
A. glycolysis
B. the cell cycle
C. cytokineses
D. photosynthesis | Cell division is just one of the stages that a cell goes through during its lifetime. All of the stages that a cell goes through make up the cell cycle . | B: the cell cycle. |
What term is used to describe birds that mate for an entire season or even stay paired for their entire life?
Here are the choices:
A. polygamous
B. asexual
C. homogeneous
D. monogamous | These birds are pairing up so that they can produce offspring. Many birds are monogamous , keeping the same mate for an entire season. In some species, they even stay paired for their entire life. | D: monogamous. |
What branch of science offers an overview of the physiology of humans?
Here are the choices:
A. engineer
B. geology
C. human biology
D. marine biology | Human Biology provides an overview of the physiology of humans, from the skin inward. In addition to the skin, the skeletal, muscular, nervous, circulatory, respiratory, digestive, excretory, immune, and reproductive systems are described. | C: human biology. |
In atherosclerosis, thickening of an arterial wall due to this can restrict blood flow through the artery?
Here are the choices:
A. high blood pressure
B. low blood pressure
C. plaque formation
D. digestion | C: plaque formation. | |
Moist skin distinguishes frogs from what animal with dry, bumpy skin?
Here are the choices:
A. toads
B. turtles
C. snakes
D. newts | Although there is actually little difference between toads and frogs, this animal would most often be called a toad. Frogs have moist skin, while toads have dry, bumpy skin. | A: toads. |
Scientists perform experiments to test their hypotheses because sometimes the nature of natural universe is what?
Here are the choices:
A. very obvious
B. this obvious
C. become obvious
D. not obvious | Scientists perform experiments to test their hypotheses because sometimes the nature of natural universe is not obvious. | D: not obvious. |
What is the term for movement toward light?
Here are the choices:
A. autolysis
B. phototaxis
C. gravitational pull
D. phototropism | Motility The majority of protists are motile, but different types of protists have evolved varied modes of movement (Figure 23.8). Some protists have one or more flagella, which they rotate or whip. Others are covered in rows or tufts of tiny cilia that they coordinately beat to swim. Still others form cytoplasmic exte... | B: phototaxis. |
Ultraviolet radiation has the highest energy; which has the lowest?
Here are the choices:
A. infrared
B. thermal
C. nuclear
D. kinetic | Ultraviolet radiation has the highest energy; infrared the lowest. | A: infrared. |
What kind of proteins either activate or deactivate the transcription of other genes?
Here are the choices:
A. master regulatory proteins
B. carbon proteins
C. master complex proteins
D. perfect regulatory proteins | What makes the heart form during development? What makes the skin form? What makes a structure become an arm instead of a leg? These processes occur during development because of a highly specific pattern of gene expression. This intensely regulated pattern of gene expression turns genes on in the right cell at the rig... | A: master regulatory proteins. |
What occurs when the pancreas doesn’t make enough insulin or else the body’s cells are resistant to the effects of insulin?
Here are the choices:
A. colitis
B. hepatitis
C. anemia
D. diabetes | Diabetes is another type of noninfectious disease. Diabetes occurs when the pancreas doesn’t make enough insulin or else the body’s cells are resistant to the effects of insulin. Insulin is a hormone that helps cells absorb glucose from the blood. | D: diabetes. |
According to the octet rule, magnesium is unstable because its valence shell has just two of what?
Here are the choices:
A. electrons
B. quarks
C. neutrons
D. protons | Chapter 2 1 The mass number is the total number of protons and neutrons in the nucleus of an atom. 3 The water hydrolyses, or breaks, the glycosidic bond, forming two monosaccharides. 4 D 6 A 8 B 10 C 12 B 14 A 16 C 18 A 20 B 22 D 24 B 26 A 28 B 30 D 32 B 33 These four elements—oxygen, carbon, hydrogen, and nitrogen—to... | A: electrons. |
What make distant objects appear both nearer and larger?
Here are the choices:
A. mirrors
B. lasers
C. astrolabes
D. telescopes | Telescopes make distant objects appear both nearer and larger. You can see many more stars through a telescope than with the unaided eye. | D: telescopes. |
The atmosphere consists of oxygen, nitrogen, carbon dioxide, which exerts a certain pressure referred to as what?
Here are the choices:
A. gravity pressure
B. nitrogen pressure
C. atmospheric pressure
D. tidal pressure | Gas Laws and Air Composition Gas molecules exert force on the surfaces with which they are in contact; this force is called pressure. In natural systems, gases are normally present as a mixture of different types of molecules. For example, the atmosphere consists of oxygen, nitrogen, carbon dioxide, and other gaseous m... | C: atmospheric pressure. |
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