question stringlengths 14 399 | distractor3 stringlengths 1 63 | distractor1 stringlengths 1 57 | distractor2 stringlengths 1 62 | correct_answer stringlengths 1 67 | support stringlengths 0 3.56k |
|---|---|---|---|---|---|
What is the hollow sac like organ that stores urine until it is excreted? | tumor | kidney | ureter | bladder | hollow, sac-like organ that stores urine until it is excreted from the body. |
What is the name of the magnetic material found in lava? | magnemite | meteorite | hemoglobin | magnetite | Magnetite is a magnetic mineral found in lava. The magnetite points to the magnetic north pole when it cools. |
What is a branded polymer that serves as energy storage in animal? | pathogen | triglyceride | hydrocarbon | glycogen | Glycogen is a branched polymer of glucose and serves as energy storage in animals. |
Milk is usually subjected to what process, where high temperatures denature the proteins in bacteria so they cannot carry out functions needed to grow and multiply? | crystallization | vaporization | Cleaning | pasteurization | When milk is pasteurized, it is heated to high temperatures. These high temperatures denature the proteins in bacteria, so they cannot carry out needed functions to grow and multiply. |
What do you call something that controls the uptake of water or another substance in the environment, in order to maintain constant internal conditions? | osmoconformers | sporozoans | protozoans | osmoregulators | |
Plastics are common examples of synthetic polymers of what abundant element? | hydrogen | silver | silicon | carbon | Synthetic carbon polymers are produced in labs or factories. Plastics are common examples of synthetic carbon polymers. You are probably familiar with the plastic called polyethylene. All of the plastic items pictured in the Figure below are made of polyethylene. It consists of repeating monomers of ethylene (C 2 H 4 )... |
Magnetite crystals of different ages and on different continents pointed to different spots. the simplest explanation is that the continents have done what? | evolved | reacted | changed | moved | Magnetite crystals of different ages and on different continents pointed to different spots. The simplest explanation is that the continents have moved. |
Protozoa can be classified on the basis of how they? | feel | smell | look | move | Protozoa can be classified on the basis of how they move. As shown in Table below , protozoa move in three different ways. Only sporozoa cannot move. Note that this classification is based only on differences in movement. It does not represent phylogenetic relationships. |
Biomass, solar, wind, water, and geothermal power are examples of what kinds of energy resources? | fossil fuel | mechanical | electrical | renewable | Renewable energy resources include solar, water, wind, biomass, and geothermal power. These resources are usually replaced at the same rate that we use them. Scientists know that the Sun will continue to shine for billions of years. So we can use the solar energy without it ever running out. Water flows from high place... |
What type of gases are the least reactive of all elements? | lucky | brave | humble | noble | Noble gases are the least reactive of all elements. That’s because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds. |
The cells of most eukaryotic and many prokaryotic organisms can carry out what type of respiration? | energetic | anaerobic | kinetic | aerobic | |
What kind of rock's makeup is changed by heat and or pressure? | igneous | tectonic | basaltic | metamorphic | Metamorphic rocks start off as some kind of rock. The starting rock can be igneous, sedimentary or even another metamorphic rock. Heat and/or pressure then change the rock’s physical or chemical makeup. |
Most scientists think that ordinary matter makes up how much of the total matter in the universe? | more than half | greater than half | about half | less than half | Most scientists who study dark matter think it is a combination. Ordinary matter is part of it. That is mixed with some kind of matter that we haven’t discovered yet. Most scientists think that ordinary matter is less than half of the total matter in the Universe. |
In machines that increase force, such as ramps and doorknobs and nutcrackers, what is the relation between output and input force? | input is greater | drop is greater | output is smaller | output is greater | For machines that increase force — including ramps, doorknobs, and nutcrackers — the output force is greater than the input force. Therefore, the mechanical advantage is greater than 1. |
What type of galaxies are oval shaped, red or yellow, and contain mostly old stars? | unique elliptical | ovoid anomalies | mutant ellipses | typical elliptical | Typical elliptical galaxies are oval shaped, red or yellow, and contain mostly old stars. |
What is the term for something in the environment that causes a reaction in an organism? | climate | pollution | crisis | stimulus | When a living thing responds to its environment, it is responding to a stimulus. A stimulus ( stimuli, plural ) is something in the environment that causes a reaction in an organism. The reaction a stimulus produces is called a response . |
What is the mildest type of brain injury? | dementia | blunt trauma | hydrocephalus | concussion | The mildest and most common type of brain injury is a concussion . This is a bruise on the surface of the brain. It may cause temporary problems such as headache, drowsiness, and confusion. Most concussions in young people occur when they are playing sports, especially contact sports like football. Other sports, like s... |
Isobaric expansion is a process occurring without a change in what? | energy | direction | temperature | pressure | isobaric expansion is a process occurring without a change in pressure. |
What is the term for the process of exposing a person to a pathogen on purpose in order to develop immunity? | priming | evacuation | ramping | vaccination | Immunity can also be caused by vaccination. Vaccination is the process of exposing a person to a pathogen on purpose in order to develop immunity. In vaccination, a modified pathogen is usually injected under the skin by a shot. Only part of the pathogen is injected, or a weak or dead pathogen is used. It sounds danger... |
Why will water balloons launched into the air eventually burst? | friction | heat | momentum | expansion | Each day, hundreds of weather balloons are launched. Made of a synthetic rubber and carrying a box of instruments, the helium-filled balloon rises up into the sky. As it gains altitude, the atmospheric pressure becomes less and the balloon expands. At some point the balloon bursts due to the expansion, the instruments ... |
What type of behaviors do not have to be learned or practiced? | diverse behaviors | protective behaviors | acquired behaviors | innate behaviors | Innate behaviors do not have to be learned or practiced. |
Terrestrial biomes are classified by the climate and their what? | geography | habitat | pollution | biodiversity | Terrestrial biomes are classified by the climate and their biodiversity , especially the types of primary producers . The world map in Figure below shows where 13 major terrestrial biomes are found. |
A flower's colors come from what part of the plant? | Internode | glycogen | Petiole | vacuole | Inside the plasma membrane of prokaryotic cells is the cytoplasm. It contains several structures, including ribosomes, a cytoskeleton, and genetic material. Ribosomes are sites where proteins are made. The cytoskeleton helps the cell keep its shape. The genetic material is usually a single loop of DNA. There may also b... |
What stages in the life of a cell does the cell cycle include? | both | adult stages | intermediate stages | all | 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. |
What do you call the type of molecular signals that include insulin and that help regulate a number of biochemical processes? | enzymes | nerves | acids | hormones | 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. |
What type of device uses electromagnetic induction to change the voltage of electric current? | mechanical transformer | radioactive transformer | hot transformer | electronic 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... |
Mutations cannot be passed on to offspring if they occur in what type of cells? | blood cells | put cells | kept cells | 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. |
What layer high in the atmosphere protects living things from most of the sun’s harmful uv rays? | stratosphere | Mesosphere | troposphere | ozone layer | 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. |
What occurs over a large area when a rock is buried or compressed? | landslide | metamorphic diffusion | cavern system | regional metamorphism | Regional metamorphism occurs over a large area when a rock is buried or compressed. |
The uterus has an external opening known as what? | fallopian tubes | cervix | ovaries | 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... |
Plants face two types of enemies: herbivores and what else? | carnivores | erosion | water | pathogens | 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... |
What organism carries out only fermentation or anaerobic respiration? | aldehydes | metabolites | aerobicc enzymes | obligate anaerobes | |
What are the smallest type of blood vessel? | arteries | varicose veins | spider veins | capillaries | 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. |
What type of behavior is most flexible? | adaptation | innate behavior | reflex behavior | learned 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... |
In the water molecule, two of the electron pairs are lone pairs rather than what? | ions pairs | bonding ions | acid pairs | bonding 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... |
What are the basic building blocks of the human body? | vitamins | proteins | minerals | cells | 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. |
What is the medial bone of the forearm that runs parallel to the radius? | radius | humerus | fibula | ulna | 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. ... |
The animal kingdom can also be divided into two basic groups, what are they? | sponges and vertebrates | mammals and fish | aquatic and land | invertebrates 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. |
These microorganisms are abundant in the human digestive track and serve many roles. what are they? | tumors | antioxidants | pathogens | bacteria | 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:. |
When both objects have a positive charge what will the force be between them? | polar | attractive | expressive | repulsive | The positive sign of the force indicates the force is repulsive. This makes sense, because both objects have a positive charge. |
What are ocean waves mainly caused by? | humidity | tides | gravity | wind | Ocean waves are energy traveling through water. They are caused mainly by wind blowing over the water. |
What type of archaea live in salty environments? | amphibians | arthropods | sporozoans | halophiles | Archaea that live in salty environments are known as halophiles. |
What can be thought of as the fundamental unit of life? | electron | ion | atom | 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... |
What type of organism is a bacteria? | paramecium | multicellular organism | fungi | single-celled prokaryotic | 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. |
What chemical element is required for a combustion reaction ? | nitrogen | carbon | helium | oxygen | 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. |
What do wind turbines turn wind energy into? | oxygen | hydrogen | carbon | electricy | 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 simple sugar such as fructose or glucose is also called a what? | galactose | carbohydrate | disaccharide | monosaccharide | 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. |
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? | beaks | fingers | claws | feathers | 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... |
Blood volume increases substantially during pregnancy, so that by childbirth, it exceeds its preconception volume by 30 percent, or approximately what? | 0-1 liters | 2-3 liters | 3-5 liters | 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 ... |
All of the land drained by a river system is called its basin, or what "wet" term? | wetlands | river bank | groundwater | watershed | 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... |
What does the gizzard in birds contain that allows them to grind food? | teeth | acid | bile | 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:. |
Equal and oppositely directed forces produce what kind of acceleration? | faster acceleration | steady acceleration | greater acceleration | 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. |
Organs are groups of what working together? | tendons | muscles | bones | tissues | |
Deep water filling a void caused by surface winds blowing water north and south is known as? | divergence | downwelling | surface current | upwelling | 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. |
What devices do astronomers use to see objects at wavelengths all across the electromagnetic spectrum? | levels | microscopes | spectrographs | telescopes | 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... |
What type of winds blow only over a limited area? | periodic | trade | Planetary | 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. |
What is the term for the spacing of individuals within a population? | population density | suspension | equilibrium | 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... |
What is the minimum number of pulleys needed for a compound pulley? | zero | 1 | 4 | 2 | Single pulleys may be fixed or moveable. Compound pulleys consist of two or more pulleys. |
Magnetic force is always perpendicular to what? | length | speed | sunlight | velocity | 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... |
What is the region in the center back of the eye that is responsible for acute vision? | pupil | cornea | lens | fovea | 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... |
What is it called when a human has an extra autosome? | mosaicism | monosomy | polysomy | trisomy | 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 ... |
Carboxylic acids can form what with alcohols? | aldehydes | lipids | ketones | esters | Carboxylic acids can form esters with alcohols. |
What are the two types of semiconductors? | a-type and b-type | n-type and m-type | o-type and p-type | n-type and p-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. |
What is the term for organisms that live in extremely hot environments? | exothermic | hydrophylic | thermophobes | 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!. |
What is a capillary bed that filters blood principally based on particle size? | plexus | buds | vein | glomerulus | 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... |
Minerals form when they precipitate from hot fluids that have done what? | accelerated down | heated up | dried out | cooled down | Minerals form when they precipitate from hot fluids that have 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? | mass to volume | ph to charge | volume to charge | mass-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... |
What helps treat bacterial infections in people? | rest | respiratory drugs | vaccines | 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 ... |
Which has more electrons, neon or fluorine? | neither | the same | fluorine | neon | 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... |
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? | activation process | controlled process | noticeable process | spontaneous 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... |
Gradual degradation of a material due to its exposure to the environment is known as what? | destruction | metabolism | erosion | corrosion | 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... |
What is the name for a matter that has a fixed volume and a fixed shape? | liquid | gas | stable | 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... |
German doctor rudolf virchow first discovered what process when studying living cells under a microscope? | photosynthesis | radiation | evolution | cell division | 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... |
What was the first mass extinction that occurred on earth? | proterozoic mass extinction | late Devonian mass extinction | paleozoic mass extinction | precambrian 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... |
What type of habitat do ferns need to grow? | dry | cold | elevated | 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. |
G2 and s are phases in what process that is important in cell division? | cytokinesis | tissues | osmosis | mitosis | 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... |
Solar energy travels in what? | neurons | ions | electrons | photons | Solar energy travels in photons. Photons travel in waves, which make up electromagnetic radiation. |
What type of joint is the knee joint? | condyloid joint | ball joint | pivot joint | hinge joint | Hinge Joint. The knee joint is a hinge joint. Like a door hinge, a hinge joint allows backward and forward movement. |
What state of matter takes the shape and volume of whatever container it occupies? | mixture | solid | liquid | gas | |
What is a high concentrated solution typically referred to as? | share solution | percent solution | saline sollution | stock 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. |
The joints that are between the bones that make up the skull are what kind of joints? | Gliding ioints | Ball and socket joints | Interphalangeal joints | immovable joints | 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 . |
What weather phenomenon increases the rate of weathering in rock and soil? | landslide | temperature | earthquake | rainfall | 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... |
What is pluto now called? | meteor | asteroid | planet | dwarf planet | 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. |
Tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume are all types of what kind of measurement? | breathing volume | respiratory volume | emitted volume | lung 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... |
What kind of a relationship do plants and soil have? | contentious relationship | one-way relationship | dimorphic relationship | two-way relationship | |
What is the process of generating electric current with a magnetic field? | molecular induction | pole induction | mechanical induction | electromagnetic 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. |
The adrenal cortex directly influences the function of what organs through the production of the hormone aldosterone to stimulate sodium reabsorption? | tumors | lungs | heart | kidneys | 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. |
What type of direction does a phase change depend on? | humidity transfer | weight transfer | power transfer | 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. |
The strength of what depends on the concentration of hydrogen ions it produces when dissolved in water? | the base | the solution | electricity | 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 ... |
What are the largest phylum in the animal kingdom? | mammals | crustaceans | cephalopods | arthropods | Arthropods are the largest phylum in the animal kingdom. |
What kind of organisms are yeasts? | protozoa | bacteria | viruses | single-celled | 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 ... |
What kind of bond consists of one sigma bond and one pi bond? | ionic bond | beta bond | covalent bond | double 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... |
What is the purpose of utilizing careful farming practices such as rotating crops or planting nutrient rich crops? | improve soil texture | improve sediment quality | improve photosynthesis quality | improve soil 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... |
What do communication satellites carry and use to provide energy during their missions? | infrared panels | geothermal panels | batteries | solar panels | Communications satellites carry solar panels to provide energy for their missions. |
What is the biogeochemical cycle that recycles water called? | Water Table | water theory | Liquid Cycle | water cycle | 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 ... |
What type of behavior is frogs croaking or deer clashing antlers an example of? | mating | instincts | learned behavior | 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. |
An atom can be classified as a particular element based solely on its what? | ability | light number | spectrum | 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... |
In the body, what essential substance is pumped from the heart into arteries and then eventually into capillaries? | lymphatic Fluid | spinal fluid | water | blood | 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... |
What (nh3) is one of the few thermodynamically stable binary compounds of nitrogen with a nonmetal? | nitrous oxide | liquid nitrogen | acetic acid | ammonia | 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 ... |
What does increased temperature cause the volume to do in a gas? | halve | disappear | decrease | increase | 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... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.