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 |
|---|---|---|---|---|---|
Why does water infiltrate the ground? | run-off from flooding | gravity | prolonged drought conditions | because soil and rocks are porous | Water infiltrates the ground because soil and rock are porous. Between the grains are pores, or tiny holes. Since water can move through this rock it is permeable. Eventually, the water reaches a layer of rock that is not porous and so is impermeable. Water stops moving downward when it reaches this layer of rock. |
What is the upward force exerted by fluids when any object, such as a boat, is placed in it? | impetuous force | human force | atomic force | bouyant force | Objects such as ships may float in a fluid like water because of buoyant force. This is an upward force that a fluid exerts on any object that is placed in it. Archimedes discovered that the buoyant force acting on an object equals the weight of the fluid displaced by the object. This is known as Archimedes’ law (or Ar... |
What do dendrites receive signals from? | electrons | hormones | fibers | neurons | |
What is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes? | meiosis | inheritance | asexual reproduction | crossing-over | When homologous chromosomes pair up during meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It results in new combinations of genes on each chromosome. |
What must be overcome to change the motion of an object? | density | pressure | weight | inertia | To change the motion of an object, inertia must be overcome by an unbalanced force acting on the object. Until the soccer player kicks the ball in Figure below , the ball remains motionless on the ground. However, when the ball is kicked, the force on it is suddenly unbalanced. The ball starts moving across the field b... |
Which action of the stomach helps chemical digestion by gastric juice? | contraction | peristalsis | chewing | churning action | |
What two lenses comprise a compound microscope? | concave and convex | polarized and focal | scope and focus | objective and eyepiece | Figure 26.16 A compound microscope composed of two lenses, an objective and an eyepiece. The objective forms a case 1 image that is larger than the object. This first image is the object for the eyepiece. The eyepiece forms a case 2 final image that is further magnified. |
Physical and chemical differences help ecologists distinguish between freshwater and marine types of what? | microbiomes | cities | habitats | biomes | |
What are the organic compounds that the body needs in small amounts to function properly; humans need 13 different ones? | nutrients | minerals | proteins | vitamins | Vitamins are organic compounds that the body needs in small amounts to function properly. Humans need 13 different vitamins. Some of them are listed below ( Table below ). The table also shows how much of each vitamin you need every day. Vitamins have many roles in the body. For example, Vitamin A helps maintain good v... |
To undo the tarnish on copper pennies, you can place them in what liquid? | seawater | distilled water | honey | vinegar | Because chemical changes produce new substances, they often cannot be undone. For example, you can’t change a fried egg back to a raw egg. Some chemical changes can be reversed, but only by other chemical changes. For example, to undo the tarnish on copper pennies, you can place them in vinegar. The acid in the vinegar... |
What kind of bonding between alcohol molecules means that more energy is required to convert the liquid to vapor, and boiling points are therefore high? | stronger diffusion bonding | weaker carbon bonding | stronger mineral bonding | stronger hydrogen bonding | Only weak London dispersion forces hold molecules of nonpolar alkanes together in the liquid phase. Consequently, less energy is required to break these molecules away from the surface of the liquid and turn them into a vapor. The stronger hydrogen bonding between alcohol molecules means that more energy is required to... |
During summer in the northern hemisphere, the north pole is tilted toward what? | horizon | moon | the north star | sun | During summer in the Northern Hemisphere, the North Pole is tilted toward the Sun. The Sun's rays strike the Northern Hemisphere more directly ( Figure below ). The region gets a lot of sunlight. Summer solstice is June 21 or 22. At that time, the Sun's rays hit directly at the Tropic of Cancer (23.5°N). This is the fa... |
Also called lodestone, the mineral magnetite is the most powerful what? | healing magnet | material on Earth | synthetic magnet | natural permanent magnet | Some materials are natural permanent magnets. The most magnetic material in nature is the mineral magnetite, also called lodestone (see Figure below ). The magnetic domains of magnetite naturally align with Earth’s axis. The picture on the left shows a chunk of magnetite attracting small bits of iron. The magnetite spo... |
How many valves are in the heart? | two | one | six | four | So how is the blood kept from flowing back on itself? Valves ( Figure below ) in the heart keep the blood flowing in one direction. The valves do this by opening and closing in one direction only. Blood only moves forward through the heart. The valves stop the blood from flowing backward. There are four valves of the h... |
Momentum is directly related to both mass and? | speed | mass | intensity | velocity | This equation shows that momentum is directly related to both mass and velocity. An object has greater momentum if it has greater mass, greater velocity, or both. For example, a bowling ball has greater momentum than a softball when both are moving at the same velocity because the bowling ball has greater mass. However... |
Bones are made up of different types of what? | fiber | blood cells | cartilage | tissue | Christopher Auyeung. Bones are made up of different types of tissues . CC BY-NC 3.0. |
What do metals typically lose to achieve stability? | molecules | ions | atoms | electrons | Metals will typically lose electrons to achieve stability, while non-metals typically gain electrons to achieve stability. Two atoms or ions with the same number of electrons are referred to as isoelectronic . |
What happens when a sperm and an egg cell combine? | stimulation | migration | manipulation | fertilization | Sexual reproduction happens when a sperm and an egg cell combine together. This is called fertilization . Sperm are released into the vagina during sexual intercourse. They “swim” through the uterus and enter a fallopian tube . This is where fertilization normally takes place. |
What is the ability to change or move matter? | density | volume | temperature | energy | Energy is the ability to change or move matter. All living things need energy. They need energy for everything they do, whether it is to move long distances or simply to carry out basic biochemical processes inside cells. Energy enters most ecosystems in the form of sunlight. In a few ecosystems, energy enters in the f... |
How many weeks are in the life cycle of ladybugs | three to six | two to four | nine to six | four to six | Ladybugs, also known as ladybird beetles, have a life cycle of four to six weeks. In one year, as many as six generations of ladybird beetles may hatch. In the spring, each adult female lays up to 300 eggs in small clusters on plants where aphids are present. After a week, the wingless larvae hatch. Both the ladybird b... |
What is the respiratory pigment of almost every vertebrate? | iron | insulin | plasma | hemoglobin | |
Objects moving at different speeds, in different directions have different what? | electrons | protons | vibrations | velocities | Objects have the same velocity only if they are moving at the same speed and in the same direction. Objects moving at different speeds, in different directions, or both have different velocities. |
What type of compounds make up the cells and tissues of organisms? | organic compounds | hormonal compounds | productive compounds | biochemical compounds | Biochemical compounds make up the cells and tissues of organisms. They are also involved in life processes, such as making and using food for energy. Given their diversity of functions, it’s not surprising that there are millions of different biochemical compounds. However, they can be grouped into just four main class... |
Meiosis and what process are both preceded by one round of dna replication; however, they differ in producing haploid or diploid daughter cells? | photosynthesis | fertilization | cloning | mitosis | Figure 7.6 Meiosis and mitosis are both preceded by one round of DNA replication; however, meiosis includes two nuclear divisions. The four daughter cells resulting from meiosis are haploid and genetically distinct. The daughter cells resulting from mitosis are diploid and identical to the parent cell. |
In their pure form, all elements have an oxidation number of what? | 7 | 3 | 2 | zero | All elements have an oxidation number of zero in their pure form. |
What is a close relationship between two species in which at least one species benefits called? | competition | parasitic | morphogenesis | symbiosis | Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism. |
Multiple sclerosis, huntington’s disease, parkinson’s disease, and alzheimer’s disease are example of diseases of which body system? | circulatory system | muscular system | lymphatic system | nervous system | There are many other nervous system diseases. They include multiple sclerosis, Huntington’s disease, Parkinson’s disease, and Alzheimer’s disease. However, these diseases rarely, if ever, occur in young people. Their causes and symptoms are listed below ( Table below ). The diseases have no known cure, but medicines ma... |
What includes the living organisms in an area and the non-living aspects of the environment? | degradation | outpost | habitat | ecosystem | An ecosystem includes the living organisms (all the populations) in an area and the non-living aspects of the environment ( Figure below ). An ecosystem is made of the biotic and abiotic factors in an area. |
Bacteria may become untreatable if they develop what in response to multiple antibiotics? | acceptance | affinity | weakness | resistance | Evasion of the Immune System by Pathogens It is important to keep in mind that although the immune system has evolved to be able to control many pathogens, pathogens themselves have evolved ways to evade the immune response. An example already mentioned is in Mycobactrium tuberculosis, which has evolved a complex cell ... |
What grows through blue cheese that gives it the distinctive appearance and flavor? | Bacteria | Viruses | Roots | fungus | Humans have collected and grown mushrooms for food for thousands of years. Figure below shows some of the many types of mushrooms that people eat. Yeasts are used in bread baking and brewing alcoholic beverages. Other fungi are used in fermenting a wide variety of foods, including soy sauce, tempeh, and cheeses. Blue c... |
The two main types of phagocytic cells in the mammalian body are neutrophils and what other? | eukaryotes | histones | leukocytes | macrophages | |
What is aggravated by practices such as logging, mining, construction, and paving surfaces? | water pollution | global warming | seismic activity | soil erosion | Logging, mining, construction, and paving surfaces are some of the ways that soil erosion increases. |
What type of hydrocarbon is coal? | liqued | mineral | gas | solid | Coal is a solid hydrocarbon. Coal is useful as a fuel, especially for generating electricity. Coal is relatively inexpensive and abundant. Developing nations, like China, rely heavily on coal. Around the world, coal is the largest source of energy for electricity. |
What chemicals in the liver support glucose homeostasis? | Force and insulin | cytosol and insulin | lactobacilli and insulin | glucagon and insulin | |
When resources become limiting, populations follow a logistic growth curve in which the size will level off at a point called what? | containing capacity | believed capacity | full capacity | carrying capacity | 19.2 Population Growth and Regulation Populations with unlimited resources grow exponentially—with an accelerating growth rate. When resources become limiting, populations follow a logistic growth curve in which population size will level off at the carrying capacity. Populations are regulated by a variety of density-d... |
Along with climate, this also influences the type of vegetation that can grow in the region? | population density | gravity | fertilizer use | soil type | Soil type also influences the type of vegetation that can grow in the region. We can identify climate types by the types of plants that grow there. |
What is defined as anything that takes up space and has mass? | atoms | electrons | elements | matter | |
What is the name of the simplest carbon molecule? | butane | Buckminsterfullerine | graphite | methane | Figure 2.13 Carbon can form four covalent bonds to create an organic molecule. The simplest carbon molecule is methane (CH4), depicted here. |
Hyperparathyroidism results from an overproduction of what? | elevated hormone | inhibited hormone | tharayroid hormone | parathyroid hormone | Hyperparathyroidism results from an overproduction of parathyroid hormone. This results in excessive calcium being removed from bones and introduced into blood circulation, producing structural weakness of the bones, which can lead to deformation and fractures, plus nervous system impairment due to high blood calcium l... |
What is formed when different gases are confined to the same container? | compact mixture | linear mixture | particulate mixture | homogeneous mixture | Gases mix homogeneously when confined to same container. When several gases are added to a container, the individual gas particles mix freely, forming a homogeneous mixture in which each type of gas is randomly distributed throughout all the available volume. |
What property of fluids causes something to stay on or near the surface of water? | weight | density | strength | buoyancy | The fishing float in Figure below bobs on the surface of the water. The fish in the figure is suspended in the water near the surface. Why do the float and fish stay on or near the surface? Why don’t they sink? The answer is buoyancy, another property of fluids. |
What are the tiny sacs in the lungs where gas exchange takes place? | chambers | vacuoles | ganglion | alveoli | Pneumonia is an illness that occurs when the alveoli, the tiny sacs in the lungs where gas exchange takes place, become inflamed and filled with fluid. When a person has pneumonia, gas exchange cannot occur properly across the alveoli. Pneumonia can be caused by many things. Infection by bacteria, viruses, fungi, or pa... |
What is the stage between a zygote and polyp? | worm | pupa | egg | larva | Cnidarians in the polyp form usually reproduce asexually. One type of asexual reproduction in polyps leads to the formation of new medusae. Medusae usually reproduce sexually with sperm and eggs. Fertilization forms a zygote. The zygote develops into a larva, and the larva develops into a polyp. There are many variatio... |
What is the term for a particle outside the nucleus of an atom that has a negative electric charge? | neutron | proton | ion | electron | An electron is a particle outside the nucleus of an atom that has a negative electric charge. The charge of an electron is opposite but equal to the charge of a proton. Atoms have the same number of electrons as protons. As a result, the negative and positive charges "cancel out. " This makes atoms electrically neutral... |
Scientists goal is develop nuclear fusion power plants, where the energy from fusion of hydrogen nuclei can be converted to what? | wind | oil | gasoline | electricity | Scientists are searching for ways to create controlled nuclear fusion reactions on Earth. Their goal is develop nuclear fusion power plants, where the energy from fusion of hydrogen nuclei can be converted to electricity. How this might work is shown in Figure below . |
In which state of matter are particles completely separate from one another? | liquid state | phosphorus state | solid state | gaseous state | Most substances may exist in any of the three common states of matter. In the gaseous state, the molecular motion has completely overcome any attraction between the particles and the particles are totally separate from each other. There are large spaces between the particles and they move large distances between collis... |
Van der waals forces are weak interactions between molecules that involve what? | photons | atoms | particles | dipoles | Van der Waals forces are weak interactions between molecules that involve dipoles. |
What part of the body does emphysema affect? | heart | bones | brain | lungs | Emphysema is a lung disease in which walls of the alveoli break down so less gas can be exchanged in the lungs (see Figure below ). This causes shortness of breath. The damage to the alveoli is usually caused by smoking and is irreversible. |
What number is the sum of the numbers of protons and neutrons present in the nucleus of an atom? | mass total | nuclear number | combined number | mass number | As you learned in Chapter 1 "Introduction to Chemistry", the mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. The mass number is an integer that is approximately equal to the numerical value of the atomic mass. Although the mass number is unitless, it is assigned units ca... |
What kind of tool, often based on mathematical equations or computer simulations, helps us understand complex systems? | panels | levels | planes | models | Food Chains. These two food chains represent complex systems in nature. They make the systems easier to understand. These are simple conceptual models. Models of very complex systems are often based on mathematical equations or computer simulations. |
An ecosystem consists of all the living things and what? | local environment | living environment | phosphorescent environment | nonliving environment | An ecosystem consists of all the living things ( biotic factors ) in a given area, together with the nonliving environment ( abiotic factors ). The nonliving environment includes water, sunlight, soil, and other physical factors. |
Mesophyll consists mainly of parenchyma cells specialized for what? | digestion | circulation | respiration | photosynthesis | |
Antibiotic drugs are usually effective in treating what kind of infections? | biological | viral | lethal | bacterial | Bacterial infections of urinary organs, especially the urinary bladder, are common. They are called urinary tract infections. Generally, they can be cured with antibiotic drugs. However, if they aren’t treated, they can lead to more serious infections and damage to the kidneys. |
What is earth’s geographic north pole also called? | right north | mere north | vertical north | true north | A compass needle lines up with Earth’s magnetic north pole. This is different from Earth’s geographic north pole, also called true north. The geographic north pole is the top of an imaginary line. This line is the axis around which Earth rotates. The geographic north pole is much like the spindle of a spinning top. The... |
What are the nonliving aspects of the environment called? | antibiotic factors | metastatic factors | nucleic factors | abiotic factors | Abiotic factors are the nonliving aspects of the environment. They include factors such as sunlight, soil, temperature, and water. |
Chemical reactions follow the laws of what? | photosynthesis | Newton | quantum physics | thermodynamics | Chemical reactions follow the laws of thermodynamics. |
What do you call a mixture of two or more substances in which dissolved particles are distributed evenly throughout? | water | concentrate | liquid | solution | A solution is a mixture of two or more substances in which dissolved particles are distributed evenly throughout the solution. The substance that dissolves in a solution is called the solute, and the substance that does the dissolving is called the solvent. The concentration of a solution is the amount of solute in a g... |
What is the water that falls from the sky called? | moisture | evaporation | condensation | precipitation | Clouds are needed for precipitation. Precipitation is water that falls from the sky. This may fall as liquid water, mostly as rain . It may fall also as frozen water, such as snow. |
What returns blood from capillaries to an atrium? | the liver | the lymph system | arteries | veins | |
Hemolymph bathes organs directly in arthropods and most molluscs, due to an open type of what system? | reproductive | nervous | pulmonary | circulatory | |
According to the table, aluminum has an atomic number of 13. therefore, every aluminum atom has 13 protons in its what? | components | processes | membrane | nucleus | According to the table, aluminum has an atomic number of 13. Therefore, every aluminum atom has 13 protons in its nucleus. Iron has an atomic number of 26. Therefore, every iron atom has 26 protons in its nucleus. Carbon has an atomic number of 6. Therefore, every carbon atom has 6 protons in its nucleus. Saylor URL: h... |
Anemia, leukemia, hemophilia, and sickle-cell disease are examples of conditions that primarily affect what? | heart | Lungs | brain | blood | Some diseases affect mainly the blood or its components. They include anemia, leukemia, hemophilia, and sickle-cell disease. |
What kind of variation does a rate measure? | construction to time | environment to time | value to time | property to time | A rate is a measure of how some property varies with time. Speed is a familiar rate that expresses the distance traveled by an object in a given amount of time. Wage is a rate that represents the amount of money earned by a person working for a given amount of time. Likewise, the rate of a chemical reaction is a measur... |
What is the name of the process that changes some chemical substances into others? | hypodermic reaction | acid reaction | mixture | chemical reaction | A chemical reaction is a process that changes some chemical substances into others. It involves breaking and forming chemical bonds. Types of chemical reactions include synthesis reactions and decomposition reactions. |
What is the term for the gases that surround a planet? | biosphere | hemisphere | galaxy | the atmosphere | An atmosphere is the gases that surround a planet. The early Earth had no atmosphere. Conditions were so hot that gases were not stable. |
Pressure and vibration are examples of what type of stimuli? | thermal | chemical | atmospheric | physical | Functional Receptor Types A third classification of receptors is by how the receptor transduces stimuli into membrane potential changes. Stimuli are of three general types. Some stimuli are ions and macromolecules that affect transmembrane receptor proteins when these chemicals diffuse across the cell membrane. Some st... |
In the chest, what divides as it enters the lungs to form the right and left bronchi? | nerves | Aorta | thyroid | trachea | In the chest, the trachea divides as it enters the lungs to form the right and left bronchi (bronchus, singular). These passages are covered with mucus and tiny hairs called cilia. The mucus traps any remaining particles in the air. The cilia move and sweep the particles and mucus toward the throat so they can be expel... |
When does an oocyte complete meiosis? | anaphase | metaphase | prophase | after sperm penetration | |
The electroplating process transfers metal from the anode to which part of the cell? | atom tube | plasma | electrode | cathode | The concentration of copper ions in the solution is effectively constant. This is because the electroplating process transfers metal from the anode to the cathode of the cell. Other metals commonly plated onto objects include chromium, gold, silver, and platinum. |
Compression, tension and shear refer to what type of force that can cause rock to change? | gravity | seismic force | process | stress | Stress is the force applied to a rock, which can cause the rock to change. The three main types of stress go along with the three types of plate boundaries. Compression is common at convergent boundaries, tension at divergent boundaries, and shear at transform boundaries. |
Unlike the biological species concept, the ecological species concept can accommodate asexual as well as ________ species. | homologous | homosexual | artificial | sexual | |
A basic function of cells includes obtaining what from glucose? | acids | food | proteins | energy | Obtaining energy from glucose is one of the basic functions of cells. Another basic function of living cells is dividing. |
What is the term for a test to see if a scientific explanation is right or wrong? | generation | invention | hypothesis | experiment | Scientists find answers using tests : When scientists want to answer a question, they search for evidence using experiments. An experiment is a test to see if their explanation is right or wrong. Evidence is made up of the observations a scientist makes during an experiment. To study the cause of death in the chimpanze... |
When a solvent with a gas dissolved in it is heated, the kinetic energy of both the solvent and solute _________? | decreases | evaporates | generates | increases | Several substances – HCl, NH 3 , and SO 2 – have solubility that decreases as temperature increases. They are all gases at standard pressure. When a solvent with a gas dissolved in it is heated, the kinetic energy of both the solvent and solute increases. As the kinetic energy of the gaseous solute increases, its molec... |
How does the bacteria look when seen with the naked eye? | oily smear | slippery smear | dry smear | slimy smear | With the naked eye, bacteria just look like a slimy smear on a petri dish. How can we study them in more detail? The invention of the microscope has allowed us to see bacteria, cells, and other things too small to be seen with the naked eye. |
What is a device used to measure temperature changes during chemical processes called? | thermometer | altimeter | alethiometer | calorimeter | The subfield of thermochemistry studies the energy changes that occur over the course of various chemical reactions. We will first look at how these changes are measured and then go into quantitative descriptions of heat transfer. Calorimetry is a term used to describe the measurement of heat transfers, usually by moni... |
Ebola is an example of a disease spread by what kind of infectious agent? | flus | bacteria | colds | virus | Ebola is a rare and deadly disease caused by infection with a strain of Ebola virus. The 2014 Ebola epidemic is the largest in history, affecting multiple countries in West Africa, including Guinea, Sierra Leone and Liberia. Ebola is spread through direct contact with blood and body fluids of a person infected by and a... |
The tiny hair present on mucus membranes is known as? | dendrites | tissue | collagen | cilia | Mucous membranes provide a mechanical barrier at body openings. They also line the respiratory, GI, urinary, and reproductive tracts. Mucous membranes secrete mucus , a slimy substance that traps pathogens. The membranes also have hair-like cilia. The cilia sweep mucus and pathogens toward body openings where they can ... |
What elements do lipids primarily consist of? | helium, hydrogen , and oxygen | silicon, hydrogen , and oxygen | iron, hydrogen , and oxygen | carbon, hydrogen, and oxygen | Lipids are organic compounds that contain mainly carbon, hydrogen, and oxygen. They include substances such as fats and oils, as well as waxes, sterols, some vitamins (A, D, E and K) and phospholipids. Lipid molecules consist of fatty acids, with or without additional molecules. Fatty acids are organic compounds that h... |
Polychaetes make up a large and diverse group. which category do the majority of these worms fall into? | amphibian | carnivorous | terrestrial | marine | |
What is the main makeup of the cell membrane? | filaments | glucose | antibodies | phospholipids | You can see a model of the cell membrane in Figure below . The molecules that make up the cell membrane are mainly phospholipids. There are two layers of phospholipids. They are arranged so the lipid tails are on the inside of the membrane. They make the interior of the membrane hydrophobic, or "water fearing". The lip... |
When a host attacks a parasitic bacteria, the bacteria release what to surround the cell wall? | protoplasma | bacteriophages | pathogens | layer of slime | Some bacteria depend on a host organism for energy and nutrients. These bacteria are known as parasites . If the host starts attacking the parasitic bacteria, the bacteria release a layer of slime that surrounds the cell wall. This slime offers an extra layer of protection. |
Solutions can also become supersaturated , where the amount of solute dissolved exceeds what? | its concentration | part solubility | its dissolution | its solubility | Solutions can also become supersaturated , where the amount of solute dissolved exceeds its solubility. Supersaturation most commonly occurs when a saturated solution is slowly cooled. They occur frequently in geological and meteorological processes. Supersaturated systems are unstable, and eventually, the solute will ... |
What is the biggest risk associated with using nuclear energy? | fire | explosion | mutation | radiation | The main concern over the use of nuclear energy is the risk of radiation. Accidents at nuclear power plants can release harmful radiation that endangers people and other living things. Even without accidents, the used fuel that is left after nuclear fission reactions is still radioactive and very dangerous. It takes th... |
What property is the result of the force of gravity being opposed by the normal force? | sound | light | density | weight | For a full description of weight, look at Forces: Mass versus Weight. In sum, weight is the result of the force of gravity being opposed by the normal force. As we just learned, objects in orbit are in freefall; they have nothing exerting a normal force against them and thus no weight. |
What are the cliffs called which are created when waves erode a rocky shoreline, leaving a vertical wall of exposed rock layers? | wave - theory | shear face | widow-makers | wave-cut | Wave-cut cliffs form when waves erode a rocky shoreline. They create a vertical wall of exposed rock layers. |
When boron10 absorbs a neutron, what does it emit? | proteins | calcium | light | particle | Boron neutron capture therapy is a potential treatment for many diseases. As the name implies, when boron10, one of the naturally occurring isotopes of boron, is bombarded with neutrons, it absorbs a neutron and emits an α particle. Write a balanced nuclear reaction for this reaction. One advantage of this process is t... |
What is the most common life form in the ocean? | coral | algae | kelp | plankton | When you think of life in the ocean, do you think of fish? Actually, fish are not the most common life forms in the ocean. Plankton are the most common. Plankton make up one of three major groups of marine life. The other two groups are nekton and benthos. Figure below shows the three groups. |
What circulates with the blood or hemolymph and are often contained within specialized cells | fat pigments | structural pigments | muscular pigments | respiratory pigments | |
What are the two possible reduction products for brf3? | brf and brf4 | brg and brf | brf2 and brf4 | brf and br2 | redox reaction will occur. The only question is whether lead will be oxidized to Pb(II) or Pb(IV). Because BrF3 is a powerful oxidant and fluorine is able to stabilize high oxidation states of other elements, it is likely that PbF4 will be the product. The two possible reduction products for BrF3 are BrF and Br2. The a... |
Normal blood is comprised of nearly half erythrocytes, which is another word for what cells? | plateletes | monocytes | white blood cells | red blood cells | Composition of Blood You have probably had blood drawn from a superficial vein in your arm, which was then sent to a lab for analysis. Some of the most common blood tests—for instance, those measuring lipid or glucose levels in plasma—determine which substances are present within blood and in what quantities. Other blo... |
What type of intense storm is a system of winds that rotate around a low pressure center, resulting in swirling air that rises and cools to create clouds and precipitation? | monsoon | hurricane | drought | cyclone | Cyclones can be the most intense storms on Earth. A cyclone is a system of winds that rotate around a low pressure center. The swirling air rises and cools. This creates clouds and precipitation. |
Blood flows into the kidney through which artery? | pulminary artery | main artery | blood artery | renal artery | Blood flows into the kidney through the renal artery. The renal artery connects to capillaries inside the kidney. Capillaries and nephrons lie very close to each other in the kidney. |
Growth and development in humans is most rapid during what two stages? | flutter and adolescence | bounce and adolescence | teen and adults | infancy and adolescence | Growth and development are most rapid during infancy and slower throughout the rest of childhood until adolescence. |
What are used to write nuclear equations for radioactive decay? | energy symbols | special symbols | chemical symbols | nuclear symbols | Nuclear symbols are used to write nuclear equations for radioactive decay. Let’s consider an example. Uranium-238 undergoes alpha decay to become thorium-234. (The numbers following the chemical names refer to the number of protons plus neutrons. ) In this reaction, uranium-238 loses two protons and two neutrons to bec... |
The pull of gravity is expressed as a force of what? | volt | joule | pascal | newtons | One force acting on you—and all the other objects on Earth—is gravity. Look at the physics book in the Figure below . Gravity pulls the book downward with a force of 20 Newtons. Why doesn’t the book fall to the ground? The table pushes upward on the book with the same amount of force. The combined force, or net force ,... |
What type of physics explains the behavior of visible light and electromagnetic waves? | statistics | Quantum mechanics | Thermodynamics | optics | We already know that visible light is the type of electromagnetic waves to which our eyes respond. That knowledge still leaves many questions regarding the nature of light and vision. What is color, and how do our eyes detect it? Why do diamonds sparkle? How does light travel? How do lenses and mirrors form images? The... |
The duodenum has a major role in regulating what digestive organ and its emptying? | respiratory | kidneys | skin | stomach | stretch receptors. This stimulates parasympathetic neurons to release acetylcholine, which then provokes increased secretion of gastric juice. Partially digested proteins, caffeine, and rising pH stimulate the release of gastrin from enteroendocrine G cells, which in turn induces parietal cells to increase their produc... |
What are misfolded versions of normal brain proteins? | humans | ribosomes | protons | prions | |
By impacting plant species and the animals they support, destruction of habitat threatens what event? | mutation | overpopulation | depletion | extinction |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.