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 |
|---|---|---|---|---|---|
A membrane has what property if it can control what molecules or ions enter or leave the cell? | susceptible permeability | indiscreet permeability | impermeability | selective permeability | Probably the most important feature of a cell’s phospholipid membranes is that they are selectively permeable or semipermeable . A membrane that is selectively permeable has control over what molecules or ions can enter or leave the cell, as shown in Figure below . The permeability of a membrane is dependent on the org... |
What is the term for the amount of space taken up by an object? | size | mass | weight | volume | |
What is the most common form of cancer in women? | melanoma | lung cancer | ovarian cancer | breast cancer | The most common type of cancer in females is breast cancer . The cancer causes the cells of the breast to grow out of control and form a tumor. Breast cancer is rare in teens. It becomes more common as women get older. If breast cancer is found early, it usually can be cured with surgery. |
Exposure to what is the most common cause of hearing loss? | outside sounds | Guitar | angry sounds | loud sounds | The most common cause of hearing loss is exposure to loud sounds. Loud sounds damage hair cells in the ear that are needed for hearing. Louder sounds damage hair cells more quickly than softer sounds. |
What basic plant structures generally have large surface areas and high surface-to-volume ratios? | flowers | roots | stems | leaves | |
What is the main component of phytoplankton? | cells | amoebas | seawater | algae | Algae play significant roles as producers in aquatic ecosystems. Microscopic forms live suspended in the water column. They are the main component of phytoplankton. As such, they contribute to the food base of most marine ecosystems. |
Metabolic enzymes catalyze catabolic reactions that break down what? | impurities | proteins | lipids | carbohydrates | 24.2 Carbohydrate Metabolism Metabolic enzymes catalyze catabolic reactions that break down carbohydrates contained in food. The energy released is used to power the cells and systems that make up your body. Excess or unutilized energy is stored as fat or glycogen for later use. Carbohydrate metabolism begins in the mo... |
Ponds and lakes are examples of what kind of biome? | standing liquid biome | standing lake biome | standing marine biome | standing freshwater biome | Freshwater biomes have water that contains little or no salt. They include standing and running freshwater biomes. Standing freshwater biomes include ponds and lakes. Lakes are generally bigger and deeper than ponds. Some of the water in lakes is in the aphotic zone, where there is too little sunlight for photosynthesi... |
The skeletons of humans and horses are examples of what? | hydroskeleton | pliant skeletons | exoskeletons | endoskeletons | Figure 38.4 The skeletons of humans and horses are examples of endoskeletons. (credit: Ross Murphy). |
What type of tissue transports water, nutrients, and food in plants? | smooth tissue | rough tissue | normal tissue | vascular tissue | A later adaption for life on land was the evolution of vascular tissue. Vascular tissue is specialized tissue that transports water, nutrients, and food in plants. In algae, vascular tissue is not necessary since the entire body is in contact with the water, and the water simply enters the algae. But on land, water may... |
Stomata are special pores that allow gasses to enter and exit what? | the soil | the skin | the flower | the leaf | Stomata are special pores that allow gasses to enter and exit the leaf. |
What is created when the wave source moves faster than the wave propagation speed? | superceding wake | loop wake | piece wake | bow wake | Sonic booms are one example of a broader phenomenon called bow wakes. A bow wake, such as the one in Figure 17.19, is created when the wave source moves faster than the wave propagation speed. Water waves spread out in circles from the point where created, and the bow wake is the familiar V-shaped wake trailing the sou... |
In a transverse wave, the highest point the wave reaches is known as the? | axis | flow | valley | crest | In a transverse wave, particles of the medium move up and down at right angles to the direction of the wave. Wave amplitude of a transverse wave is the difference in height between the crest and the resting position. The crest is the highest point particles of the medium reach. The higher the crests are, the greater th... |
Which orbitals do electrons fill first? | furthest from nucleus | empty orbitals | charged orbitals | closest to the nucleus | Electrons fill orbitals in a consistent order: they first fill the orbitals closest to the nucleus, then they continue to fill orbitals of increasing energy further from the nucleus. If there are multiple orbitals of equal energy, they will be filled with one electron in each energy level before a second electron is ad... |
Many discrete characters are determined by a single gene locus with different alleles that produce distinct what? | subtypes | clusters | phototypes | phenotypes | |
What is the hardest type of coal? | peat | Bituminous | lignite | anthracite | 5. Anthracite is the hardest type of coal because it is metamorphic. Anthracite causes less pollution when it burns. Why do you think that is?. |
All cells have voltages across their what? | nuclei | display membranes | ribosomes | plasma membranes | |
Which is the largest planet in our solar system? | titan | uranus | neptune | jupiter | Jupiter is the largest planet in our solar system. |
A crucial function of the cranial nerves is to keep visual stimuli centered on the fovea of what eye structure? | pupil | iris | scelra | retina | Testing eye movement is simply a matter of having the patient track the tip of a pen as it is passed through the visual field. This may appear similar to testing visual field deficits related to the optic nerve, but the difference is that the patient is asked to not move the eyes while the examiner moves a stimulus int... |
In what process is energy from the sun converted to stored chemical energy in an organism? | cellular respiration | metabolism | digestion | photosynthesis | There is no reason to think that the alignment of the stars has anything to do with events that happen on Earth. The constellations are patterns made from stars in the sky. The patterns do not reflect any characteristics of the stars themselves. When scientific tests are done to provide evidence in support of astrologi... |
Sunlight gives plants the energy they need for what? | glycolysis | respiration | absorption | photosynthesis | Plants can get the energy they need for photosynthesis from either sunlight or artificial light. |
What is lowered when salts go into ion form? | power | charge | voltage | resistance | Most of the body’s resistance is in its dry skin. When wet, salts go into ion form, lowering the resistance significantly. The interior of the body has a much lower resistance than dry skin because of all the ionic solutions and fluids it contains. If skin resistance is bypassed, such as by an intravenous infusion, a c... |
What is produced during the hydrogenation of vegetable oils? | partially-hydrogenated fatty acids | complete fatty acids | rich fatty acids | trans fatty acids | taste, and nutrition of butter. (Preservatives and antioxidants are also added. ) In most commercial peanut butter, the peanut oil has been partially hydrogenated to prevent it from separating out. Consumers could decrease the amount of saturated fat in their diet by using the original unprocessed oils on their foods, ... |
Where does fertilization usually take place? | vagina | uterus | ovary | fallopian tubes | A day or two after an ovary releases an egg, the egg may unite with a sperm. Sperm are deposited in the vagina during sexual intercourse. They propel themselves through the uterus and enter a fallopian tube . This is where fertilization usually takes place. |
What monitors the level of carbon dioxide in the blood? | the kidneys | the lungs | the heart | the brain stem | The regular, rhythmic contractions of the diaphragm are controlled by the brain stem. It sends nerve impulses to the diaphragm through the autonomic nervous system. The brain stem monitors the level of carbon dioxide in the blood. If the level becomes too high, it “tells” the diaphragm to contract more often. Breathing... |
When volume does not change, temperature is proportional to what other property? | Density | Length | resistance | pressure | Pressure and temperature at constant volume are directly proportional. |
Single-displacement reactions are a subset of what? | particle reactions | gravitational reactions | kinetic reactions | redox reactions | Single-displacement reactions are a subset of redox reactions. In this subset, what is oxidized and what is reduced? Give an example of a redox reaction that is not a single-displacement reaction. |
What is the process by which the substances you consume are taken up by the blood? | digestion | evaporation | filtration | absorption | Absorption is the process that allows substances you eat to be taken up by the blood. After food is broken down into small nutrient molecules, the molecules are absorbed by the blood. After absorption, the nutrient molecules travel in the bloodstream to cells throughout the body. This happens mostly in the small intest... |
Why do electronegativities decrease from top to bottom? | larger electric pull | smaller atomic size | larger atomic variation | larger atomic size | Electronegativities generally increase from left to right across a period. This is due to an increase in nuclear charge because of the greater number of protons in the nucleus. Alkali metals have the lowest electronegativities, while halogens have the highest. Because most noble gases do not form compounds, they are ge... |
What are the three types of symbiosis? | internalization , parasitism , commensalism | connectionism , parasitism , commensalism | commensalism, osmosis, internalization | mutualism, parasitism, commensalism | Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be beneficial, harmful, or neutral. There are three types of symbiosis: mutualism, parasitism, and commensalism. |
What term is used to describe the ability to change or move matter? | speed | mass | inertia | energy | Everything you do takes energy. Energy is the ability to change or move matter. Whether it’s reading these words or running a sprint, it requires energy. In fact, it takes energy just to stay alive. Where do you get energy? You probably know the answer. You get energy from food. Figure {{ref|MS-LS-SE-02-03-Food|below}]... |
What measures exactly how much gravity is pulling on something? | dimension | size | matter | weight | The amount of inertia an object has is simply related to the mass of the object. Mass and Weight are two different things. Mass (typically in units of kg or grams) is basically a measure of what comprises an object. Weight is the measure of how much the force of gravity is pulling on you. In fact, instead of saying 'I ... |
Where do producers in an ecosystem generally get their energy from? | consumers | predators | chlorophyll | the sun | The survival of every ecosystem is dependent on the producers. Without producers capturing the energy from the sun and turning it into glucose, an ecosystem could not exist. On land, plants are the dominant producers. Phytoplankton , tiny photosynthetic organisms, are the most common producers in the oceans and lakes. ... |
Generators usually transform kinetic energy into what kind of energy? | nuclear energy | subsequent energy | potential energy | electrical energy | Generators may produce either alternating or direct current, but they all change kinetic energy to electrical energy. |
Most modern seed plants are angiosperms that produce seeds in the what of flowers? | stems | lungs | kidneys | ovaries | Most modern seed plants are angiosperms that produce seeds in the ovaries of flowers. |
Most enzymes are classified as what? | hormones | lipids | acids | proteins | |
Each hemisphere of the brain contains regions called what that are involved in different functions? | chambers | nodes | folds | lobes | Visit the following website (http://openstaxcollege. org/l/split-brain2) to learn more about split-brain patients and to play a game where you can model split-brain experiments yourself. Each hemisphere contains regions called lobes that are involved in different functions. Each hemisphere of the mammalian cerebral cor... |
Emphysema is a chronic disease caused by the breakdown of the what tissue? | brain | heart | liver | lung | Emphysema is a chronic lung disease caused by the breakdown of the lung tissue. Symptoms of emphysema include shortness of breath, especially during exercise, and chronic cough, usually due to cigarette smoking, and wheezing, especially during expiration. Damage to the alveoli ( Figure below ), is not curable. Smoking ... |
Lactose is a disaccharide consisting of the monomers glucose and what? | sucrose | fructose | glycerol | galactose | Common disaccharides include lactose, maltose, and sucrose (Figure 3.8). Lactose is a disaccharide consisting of the monomers glucose and galactose. It is found naturally in milk. Maltose, or malt sugar, is a disaccharide formed by a dehydration reaction between two glucose molecules. The most common disaccharide is su... |
Why does photosynthesis not occur in the deep-water zone? | it is stagnant | it is cold | it is pressurized | it is dark | The deep-water zone is dark so there is no photosynthesis. Most deep-water organisms are scavengers. They feed on dead organisms that fall to the bottom of the lake. Crabs and catfish are two of these types of organisms. Fungi and bacteria are decomposers that live in the deep zone. |
What, now former, planet is small, icy, and rocky? | neptune | mercury | jupiter | pluto | Pluto was different in other ways. The outer planets are all gas giants. Pluto is small, icy, and rocky. Pluto has a diameter of about 2,400 km. It has only about one-fifth the mass of Earth’s Moon. Pluto’s orbit is tilted relative to the other planets. It's orbit is shaped like a long, narrow ellipse. Pluto’s orbit so... |
What process allows plants to convert light energy into sugars and energy for food? | digestion | respiration | glycolysis | photosynthesis | Chemical reactions are occurring all around you. Plants use sunlight to drive their photosynthetic process and produce energy. Cars and other vehicles burn gasoline in order to power their engines. Batteries use electrochemical reactions to produce energy and power many everyday devices. Many chemical reactions are goi... |
What is the equation of power released? | uptake x current | amplitude x current | detonation x current | voltage x current | ; Power released is equal to the voltage multiplied by the current. |
Silencing genes through epigenetic mechanisms is commonly practiced on what type of uncontrolled cells? | innoculous cells | giving cells | neutral cells | cancer cells | Cancer and Epigenetic Alterations Silencing genes through epigenetic mechanisms is also very common in cancer cells. There are characteristic modifications to histone proteins and DNA that are associated with silenced genes. In cancer cells, the DNA in the promoter region of silenced genes is methylated on cytosine DNA... |
Along with muscles, what helps the body move with relatively little force? | nerves | glands | limbs | joints | With the help of muscles, joints allow the body to move with relatively little force. |
What process do all species use to make the next generation? | variation | separation | differentiation | reproduction | All living things reproduce to make the next generation. Organisms that do not reproduce will go extinct. As a result, there are no species that do not reproduce ( Figure below ). Some organisms reproduce asexually ( asexual reproduction ), especially single-celled organisms, and make identical copies (or clones) of th... |
According to one of einstein's theory, while light consists of particles, it behaves like this. | molecules | thermodynamics | tides | waves | After Einstein proposed his theory, evidence was discovered to support it. For example, scientists shone laser light through two slits in a barrier made of a material that blocked light. You can see the setup of this type of experiment in the Figure below . Using a special camera that was very sensitive to light, they ... |
Soil forms where land areas are what? | solid | merging | cool | flat | Weathered material washes off steep slopes and so does not stay in place to form soil. Soil forms where land areas are flat or gently undulating. |
An estimated 99 percent of the species that have ever lived on earth no longer exist, showing that what event is common? | pollution | accumulation | over fishing | extinction | Even though large life forms have been very successful on Earth, most of the life forms on Earth today are still prokaryotes—small, relatively simple single-celled organisms. Fossils indicate that many organisms that lived long ago are extinct. Extinction of species is common; in fact, it is estimated that 99% of the s... |
What type of energy is the energy of moving matter? | potential energy | dynamic energy | residual energy | kinetic energy | Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energy—from atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a piece of metal. |
What does bile help to digest ? | nuts | food | protein | fat | The liver secretes bile acids. Bile acids help digest fat. Some liver bile is secreted directly into the small intestine. |
A gene may have different versions called what? | locus | genomes | peptides | alleles | Traits are controlled by genes on chromosomes. A gene may have different versions called alleles. |
Nonvascular plants lack vascular tissue and what? | cells | cytoplasm | chlorophyll | seeds | Nonvascular plants lack seeds and vascular tissue. |
What is a mixture of metal with one or more other elements? | a metalloid | an alkali metal | a halloid | an alloy | An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more useful properties than pure metals. Se... |
Pheromones enable what, which is vital for organisms like ants that live in a large community? | migration | adaptation | asexual reproduction | communication | Living in a large colony requires good communication. Ants communicate with chemicals called pheromones. For example, an ant deposits pheromones on the ground as it returns to the nest from a food source. It is marking the path so other ants can find the food. Honeybees communicate by doing a “waggle dance. ”. |
What is the part of the shadow that is partially lit called? | pentila | eclipse | pleura | penumbra | The penumbra is the part of the shadow that is partially lit. |
When a mountain stream flows onto flatter land and comes to a stop rapidly, what do the deposits form? | upstream fan | conical fan | vertical fan | alluvial fan | In arid regions, a mountain stream may flow onto flatter land. The stream comes to a stop rapidly. The deposits form an alluvial fan ( Figure below ). |
The processes of homeostasis and temperature control are centered in the hypothalamus of the advanced animal brain, thus thermoregulation depends on what organ system? | cardiovascular system | circulatory system | digestive system | nervous system | Neural Control of Thermoregulation The nervous system is important to thermoregulation, as illustrated in Figure 33.22. The processes of homeostasis and temperature control are centered in the hypothalamus of the advanced animal brain. |
Light from objects at different distances is focused by what part of the eye? | meniscus | iris | pupil | lens | Light from objects at different distances is focused by the lens of the eye. Muscles in the eye control the shape of the lens so the light is focused on the back of the eye no matter how far the object is from the lens. |
Breaking a window with a baseball is an example of what kind of change in matter? | sudden | unusual | chemical | physical | You hit a baseball out of the park and head for first base. You’re excited. The score is tied, and now your team has a chance of getting a winning home run. Then you hear a crash. Oh no! The baseball hit a window in a neighboring house. The glass has a big hole in it, surrounded by a web of cracks (see Figure below ). ... |
Scientists will often observe and then what the reason why a phenomenon occurred? | theorize | realize | normalize | hypothesize | 2.3 Scientific method The scientific method is not a step by step, linear process. It is an intuitive process, a methodology for learning about the world through the application of knowledge. Scientists must be able to have an "imaginative preconception" of what the truth is. Scientists will often observe and then hypo... |
Similar to the coil on a stove, changes in what reflect an increase in the temperature of a star? | rotation | texture | direction | color | Think about the coil of an electric stove as it heats up. The coil changes in color as its temperature rises. When you first turn on the heat, the coil looks black. The air a few inches above the coil begins to feel warm. As the coil gets hotter, it starts to glow a dull red. As it gets even hotter, it becomes a bright... |
Proto-oncogenes are positive cell-cycle regulators but when mutated, they can become what? | cultigens and cause cancer | microbes and cause cancer | bacteria and cause cancer | oncogenes and cause cancer | Watch this animation (http://openstaxcollege. org/l/p53_cancer) to learn more about the use of p53 in fighting cancer. Proto-oncogenes are positive cell-cycle regulators. When mutated, proto-oncogenes can become oncogenes and cause cancer. Overexpression of the oncogene can lead to uncontrolled cell growth. This is bec... |
When the maximum amount of solute has been dissolved in a given amount of solvent, we say that the solution is what? | empty | blended | used | saturated | When the maximum amount of solute has been dissolved in a given amount of solvent, we say that the solution is saturated with solute. When less than the maximum amount of solute is dissolved in a given amount of solute, the solution is unsaturated. These terms are also qualitative terms because each solute has its own ... |
What is the movement of substances across the membrane without the expenditure of cellular energy called? | active transport | inner cell transport | immune transport | passive transport | membrane are nonpolar). Some examples of these are other lipids, oxygen and carbon dioxide gases, and alcohol. However, water-soluble materials—like glucose, amino acids, and electrolytes—need some assistance to cross the membrane because they are repelled by the hydrophobic tails of the phospholipid bilayer. All subst... |
What energy, produced by vibrations, cannot travel through empty space? | plasma | light | heat | sound | The drummer in Figure below is hitting the drumheads with drumsticks. This causes the drumheads to vibrate. The vibrations pass to surrounding air particles and then from one air particle to another in a wave of energy called sound energy . We hear sound when the sound waves reach our ears. Sound energy can travel thro... |
According to rutherford, where is the vast majority of the mass of an atom located? | the electrons | the cytoplasm | the shell | the nucleus | Rutherford’s experiment showed that the vast majority of the mass of an atom is concentrated in its nucleus, which is composed of protons and neutrons. The mass of an electron is very small compared to the mass of a neutron or proton, so the electrons in an element do not contribute much to the total mass. The mass num... |
What is the term for organisms that make their own food? | monocots | omnivores | plastids | autotrophs | Autotrophs are organisms that make their own food. Most autotrophs use the energy in sunlight to make food in a process called photosynthesis . Only three types of organisms—plants, algae, and some bacteria—can make food through photosynthesis. Examples of each type of photosynthetic organism are shown in Figure below ... |
What happens to neutral matter when electrons are transferred between objects? | it dissolves itself | osmosis | it stays neutral | it becomes charged | Whenever electrons are transferred between objects, neutral matter becomes charged. For example, when atoms lose or gain electrons they become charged particles called ions. |
Seawalls and breakwaters are built parallel to what? | the deep | center-point | ocean base | shore | Seawalls and breakwaters are built parallel to the shore. |
What is the term for the loss of one or more electrons by an atom? | evaporation | half-life | decomposition | oxidation | The reactants are two electrically neutral elements; they have the same number of electrons as protons. The product, however, is ionic; it is composed of Mg2+ and Cl−ions. Somehow, the individual Mg atoms lose two electrons to make the Mg2+ ion, while the Cl atoms gain an electron to become Cl− ions. This reaction invo... |
What are the lipids containing phosphorus? | alkaloids | eukaryotes | hemoglobin | phospholipids | plants. Saturated triglycerides are those containing a higher proportion of saturated fatty acid chains (fewer carbon-to-carbon double bonds); unsaturated triglyceridescontain a higher proportion of unsaturated fatty acid chains. Saponification is the hydrolysis of a triglyceride in a basic solution to form glycerol an... |
Ethers readily dissolve what type of molecules? | polar | proteins | lipids | non-polar | Ethers are good solvents for other organic compounds because of their low reactivity. They readily dissolve non-polar molecules. Diethyl ether is perhaps the best known ether. It is widely used as a solvent and has been used as an inhalable anesthetic. |
What are bones made up of? | muscles | molecules | platelets | tissues | Bones are made up of different types of tissues. |
When it is winter in the northern hemisphere the southern hemisphere experiences which season? | spring | winter | autumn | summer | |
What happens when liquid water evaporates? | snow | condensation | seawater happens | humidity happens | The water cycle plays an important role in weather. When liquid water evaporates, it causes humidity. When water vapor condenses, it forms clouds and precipitation. Humidity, clouds, and precipitation are all important weather factors. |
What vision defect occurs because the eye is too long? | astigmatism | hyperopia | blindness | myopia | In myopia, the eye is too long. Below, you can see how images are focused on the retina of someone with myopia ( Figure below ). Myopia is corrected with a concave lens, which curves inward like the inside of a bowl. The lens changes the focus, so images fall on the retina as they should. |
What happens when a neutral atom gains or loses electrons? | it loses neutrons | it loses protons | it gains protons | it becomes an ion | As we studied in our chapter on the periodic table, we saw that elements share a number of important properties with other elements found in the same group. The chemical behavior of a given element is largely dictated by the configuration of its valence electrons. Many elements have a tendency to gain or lose electrons... |
Why are goose feathers preferred for stuffing by manufacturers? | thickness | multi layers build up | smoothness | softness | Feathers are also used all over the world to stuff pillows, mattresses, sleeping bags, coats, and quilting. Goose feathers are preferred because they are soft. Manufacturers often mix goose feathers with down feathers to provide extra softness. |
What is the outermost part of the sun's atmosphere called? | particles | rays | ultraviolet | corona | The corona ( Figure below ) is the outermost part of the Sun's atmosphere. It is the Sun’s halo, or “crown. ” With a temperature of 1 to 3 million K, the corona is much hotter than the photosphere. The corona extends millions of kilometers into space. Sometime you should try to see a total solar eclipse. If you do, you... |
What is the series of changes in the life of an organism? | circle of life | insect metamorphosis | evolution | life cycle | Organisms that have a diploid life cycle spend the majority of their lives as diploid adults. All diploid adults inherit half of their DNA from each parent. When they are ready to reproduce, diploid reproductive cells undergo meiosis and produce haploid gametes. These gametes then fuse through fertilization and produce... |
The outer planets are made of hydrogen and helium, so they are termed what? | helium giants | hydrogen giants | light giants | gas giants | The outer planets are made of hydrogen and helium, so they are called gas giants. |
When a liquid is heated, molecules with enough kinetic energy escape the liquid and become what? | solid | invisible | atoms | vapor | Kinetic energy distribution curves for a liquid at two temperatures T 1 and T 2 . The shaded area is the molecules with enough kinetic energy to escape the liquid and become vapor. |
What property of an object is obtained by multiplying its mass and its velocity? | movement | fluid | component | momentum | When skater 2 runs into skater 1, he’s going faster than skater 1 so he has more momentum. Momentum is a property of a moving object that makes it hard to stop. It’s a product of the object’s mass and velocity. At the moment of the collision, skater 2 transfers some of his momentum to skater 1, who shoots forward when ... |
Solutions that are prepared in which a solute concentration exceeds its solubility are called what? | mineralized | solidified | instantiated | supersaturated | Solutions may be prepared in which a solute concentration exceeds its solubility. Such solutions are said to be supersaturated, and they are interesting examples of nonequilibrium states. For example, the carbonated beverage in an open container that has not yet “gone flat” is supersaturated with carbon dioxide gas; gi... |
The word fungus comes from the latin word for what? | spore | mold | vegetable | mushroom | Introduction The word fungus comes from the Latin word for mushrooms. Indeed, the familiar mushroom is a reproductive structure used by many types of fungi. However, there are also many fungi species that don't produce mushrooms at all. Being eukaryotes, a typical fungal cell contains a true nucleus and many membrane-b... |
The part of a plant that is responsible for reproduction is the? | root | leaf | stem | flower | |
Isotopes have the same number of protons and electrons, but a different number of what? | atoms | reactions | impurities | neutrons | Isotopes have the same number of protons and electrons, but a different number of neutrons. |
Shivering and adipose tissue called brown fat are used by mammals in particular to produce what? | nutrition | energy | blood | heat | Many animals, especially mammals, use metabolic waste heat as a heat source. When muscles are contracted, most of the energy from the ATP used in muscle actions is wasted energy that translates into heat. Severe cold elicits a shivering reflex that generates heat for the body. Many species also have a type of adipose t... |
Where are the somas of sensory neurons located in the spinal cord? | frontal head ganglia | frontal root ganglia | penetration root ganglia | dorsal root ganglia | Figure 35.29 Spinal nerves contain both sensory and motor axons. The somas of sensory neurons are located in dorsal root ganglia. The somas of motor neurons are found in the ventral portion of the gray matter of the spinal cord. |
The thick tunica media allows muscular arteries to play a leading role in what? | accumulation | inhibition | vasodilation | vasoconstriction | Farther from the heart, where the surge of blood has dampened, the percentage of elastic fibers in an artery’s tunica intima decreases and the amount of smooth muscle in its tunica media increases. The artery at this point is described as a muscular artery. The diameter of muscular arteries typically ranges from 0.1 mm... |
Why do crystals have relatively sharp and well-defined melting points? | angular intermolecular forces | particular intermolecular forces | variable intermolecular forces | uniform intermolecular forces | Deformation of the ionic crystal causes one plane of atoms to slide along another. The resulting repulsive interactions between ions with like charges cause the layers to separate. Crystals tend to have relatively sharp, well-defined melting points because all the component atoms, molecules, or ions are the same distan... |
In which area does conduction mainly happen? | mesosphere | higher atmosphere | thermosphere | lower atmosphere | In conduction , heat is transferred from molecule to molecule by contact. Warmer molecules vibrate faster than cooler ones. They bump into the cooler molecules. When they do, they transfer some of their energy. Conduction happens mainly in the lower atmosphere. Can you explain why?. |
What is secreted by the cells surrounding spermatogonia to help sperm production? | follicle stimulating hormone | estrogen | dihydrotestosterone | testosterone | Seminiferous tubules can be seen in a cross section of a testis pictured in Figure below . The tubule is lined with spermatogonia, which are diploid, sperm-producing cells. Surrounding the spermatogonia are other cells. Some of these other cells secrete substances to nourish sperm, and some secrete testosterone, which ... |
Chemical reactions either require or release what? | enzymes | light | electricity | energy | Chemical reactions either require energy or release energy. The amount of energy needed or released depends upon the structure of the molecules that are involved in the reaction. Some reactions need to be heated for long periods of time in order for change to take place. Other reactions release energy, allowing heat to... |
Energy that is released when a chemical reaction takes place is known as what? | thermal energy | liquid energy | consequence energy | chemical energy | |
What is the largest object in the solar system? | jupiter | the orbit | the earth | the sun | The Sun is just an average star compared to other stars. But it is by far the largest object in the solar system. The Sun is more than 500 times the mass of everything else in the solar system combined! Listed below is data on the sizes of the Sun and planets relative to Earth ( Table below ). |
In ovoviviparous fish like shark, what develops inside the mother’s body but without nourishment from the mother? | molecules | genes | spores | eggs | Nearly all fish reproduce sexually, and most species have separate sexes. Those without separate sexes avoid self-fertilization by producing sperm and eggs at different times. Each fish typically produces a large number of gametes. In most fish species, fertilization takes place externally. These fish are oviparous. Eg... |
What is the term for a technique used to separate out homogeneous mixtures in which one or more solids are dissolved in a liquid? | distillation | transpiration | absorption | evaporation | Evaporation is a technique used to separate out homogeneous mixtures in which one or more solids are dissolved in a liquid. Typically, the mixture is heated until all of the liquid has vaporized, leaving behind the dissolved solids ( Figure below ). The vapor can also be captured and recondensed into a liquid if desire... |
How do basal mammals like monotreme reproduce? | live birth | cloning | budding | by laying eggs | Monotremes reproduce by laying eggs. They have a cloaca instead of a uterus and vagina. The eggs pass through the opening of the cloaca. This form of reproduction is the least risky for the mother. However, eggs are harder to protect than is an embryo or a fetus in a pouch or uterus. Therefore, monotreme offspring may ... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.