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Deficiency of what is symptomized by nausea, fatigue and dizziness, and can be triggered by excessive sweating? | calories | impurities | salts | electrolytes | An alkaline battery is a variation on the zinc-carbon dry cell. The alkaline battery has no carbon rod and uses a paste of zinc metal and potassium hydroxide instead of a solid metal anode. The cathode half-reaction is the same, but the anode half-reaction is different. |
Most thoracic vertebrae have two facets that articulate with the head of what structure? | pelvic | calf | heart | rib | Thoracic Vertebrae The bodies of the thoracic vertebrae are larger than those of cervical vertebrae (Figure 7.26). The characteristic feature for a typical midthoracic vertebra is the spinous process, which is long and has a pronounced downward angle that causes it to overlap the next inferior vertebra. The superior ar... |
Thrombocytes are more commonly known by what name? | droplets | chromosomes | molecules | platelets | Platelets and Coagulation Factors Blood must clot to heal wounds and prevent excess blood loss. Small cell fragments called platelets (thrombocytes) are attracted to the wound site where they adhere by extending many projections and releasing their contents. These contents activate other platelets and also interact wit... |
What is the term for the remains or traces of living organisms? | deposits | remains | ethings | fossils | Fossils are the remains or traces of living organisms. |
What type of disease is caused by pathogens? | autoimmune diseases | viral diseases | nervous diseases | infectious diseases | Infectious diseases are diseases that are caused by pathogens. Human pathogens include bacteria, viruses, fungi, and protozoa. Different pathogens spread in different ways. Pathogens may spread through contaminated food or water, sexual contact, droplets in the air from coughs or sneezes, contaminated objects or surfac... |
Worms grow to adult size without going through what stage? | growth | egg | development | larval | In some species, the same individual produces both sperm and eggs. But worms mate to exchange sperm, rather than self-fertilizing their own eggs. Fertilized eggs are deposited in a mucous cocoon. Offspring emerge from the cocoon looking like small adults. They grow to adult size without going through a larval stage. |
What serves as a first responder to pathogenic threats that bypass natural physical and chemical barriers of the body? | immense immune system | cells immune system | super immune system | innate immune system | CHAPTER SUMMARY 42.1 Innate Immune Response The innate immune system serves as a first responder to pathogenic threats that bypass natural physical and chemical barriers of the body. Using a combination of cellular and molecular attacks, the innate immune system identifies the nature of a pathogen and responds with inf... |
Of the three basic types of emissions, which has the highest penetrating power? | chemical radiation | ultraviolet radiation | fluid radiation | gamma radiation | Of the three basic types of emissions, gamma radiation has the highest penetrating power. Thick, high density materials (such as lead) are required to stop gamma emissions. The thickness of the shielding will determine the effectiveness of the protection offered by the lead. |
True animals are divided into those with radial versus bilateral styles of what? | magnetic | attracted | molecular | symmetry | 27.2 Features Used to Classify Animals Organisms in the animal kingdom are classified based on their body morphology and development. True animals are divided into those with radial versus bilateral symmetry. Generally, the simpler and often non-motile animals display radial symmetry. Animals with radial symmetry are a... |
While still an early fetus, what is the skeleton made of? | gel | ligament | membrane | cartilage | Early in the development of a human fetus, the skeleton is made entirely of cartilage. The relatively soft cartilage gradually turns into hard bone through ossification . This is a process in which mineral deposits replace cartilage. As shown in Figure below , ossification of long bones, which are found in the arms and... |
What forms the pathway of water and nutrients from roots to leaves and flower? | the pistil | the stamen | the stigma | the stem | |
What proteins span the entire plasma membrane? | cytoplasm | sequence | amino acids | transmembrane | Transmembrane proteins span the entire plasma membrane. Their function is mainly to regulate the transport of specific molecules across the membrane. There are two basic types of transmembrane proteins, alpha-helical and beta-barrels, which are discussed in Organic Compounds: Proteins (Advanced) . |
Why is blue cheese blue? | fermentation | artificial dye | bacteria | fungus | Stuart Webster. Blue cheese is blue because of the fungus growing throughout it. . CC BY 2.0. |
What type of joint are ball-and-socket, hinge, and pivot examples of? | fixed | retractable | artificial | movable | Joints may be immovable, partly movable, or movable. Types of movable joints include ball-and-socket, hinge, and pivot joints. |
Are valence electrons attracted more or less strongly when they are farther from the nucleus? | differently | equally | more strongly | less strongly | The reactivity of alkaline Earth metals increases from the top to the bottom of the group. That’s because the atoms get bigger from the top to the bottom, so the valence electrons are farther from the nucleus. When valence electrons are farther from the nucleus, they are attracted less strongly by the nucleus and more ... |
What do we call the predictable distribution of molecular speeds found in gas of many molecules? | kemp - boltzmann distribution | mitchell - boltzmann distribution | burns - boltzmann distribution | maxwell-boltzmann distribution | • The motion of individual molecules in a gas is random in magnitude and direction. However, a gas of many molecules has a predictable distribution of molecular speeds, known as the Maxwell-Boltzmann distribution. |
Name the simple sugar that is a component of starch. | insulin | Fructose | Splenda | glucose | 3.2 | Carbohydrates By the end of this section, you will be able to: • Discuss the role of carbohydrates in cells and in the extracellular materials of animals and plants • Explain the classifications of carbohydrates • List common monosaccharides, disaccharides, and polysaccharides Most people are familiar with carboh... |
What do vertebrates have which invertebrates do not? | tails | appendages | fangs | backbones | Vertebrates have a backbone, but invertebrates do not. Except for the chordates, all animal phyla consist only of invertebrates. Chordates include both vertebrates and invertebrates. |
Occuring throughout the lifespan of the organism, what stages proceed in a certain order? | genetic stages | yearly stages | life effectiveness stages | life cycle stages | |
The fetus is connected to what by a tube called the umbilical cord? | Fallopian tube | Stomach | Intestines | placenta | The placenta is a spongy mass of blood vessels. Some of the vessels come from the mother. Some come from the fetus. The placenta is attached to the inside of the mother’s uterus. The fetus is connected to the placenta by a tube called the umbilical cord . The cord contains two arteries and a vein. Substances pass back ... |
What are most fresh fruits, vegetables, whole grains rich in? | magnesium | calcium | cholesterol | cellulose | |
What term tells you how quickly the angle changes and can occur in either clockwise or counterclockwise directions? | turning velocity | emit velocity | shift velocity | angular velocity | The angular velocity tells you how quickly the angle changes. In more formal language, the rate of change of , the angular position, is called the angular velocity . The direction of angular velocity is either clockwise or counterclockwise. Analogously, the rate of change of is the angular acceleration . |
What term is used to describe how fast a chemical reaction occurs? | velocity | response time | catalysis | reaction rate | How fast a chemical reaction occurs is called the reaction rate . Several factors affect the rate of a given chemical reaction. They include the:. |
What is the term for protists that produce spores, such as the toxoplasm? | newborns | protozoans | spermatozoa | sporozoans | The sporozoans are protists that produce spores, such as the toxoplasma . These protists do not move at all. The spores develop into new protists. |
Why does neptune's appearance change? | the speed of rotation | the seasons | the changing orbit | turbulent atmosphere | Neptune's appearance changes due to its turbulent atmosphere. Winds are stronger than on any other planet in the solar system. Wind speeds can reach 1,100 km/h (700 mph). This is close to the speed of sound! The rapid winds surprised astronomers. This is because Neptune receives little energy from the Sun to power weat... |
Changing levels of what substances partly explain emotional ups and downs in teens? | enzymes | nutrients | acids | hormones | Many teens have emotional ups and downs. This is at least partly due to their changing hormone levels. |
What term refers to larger evolutionary changes that result in new species? | substantial evolution | Microevolution | Potential evolution | macroevolution | Macroevolution refers to larger evolutionary changes that result in new species. |
What do you call a lens that causes the light rays to bend away from its axis? | converging lens | optical lens | axilens | diverging lens | • A lens that causes the light rays to bend away from its axis is called a diverging lens. • Ray tracing is the technique of graphically determining the paths that light rays take. • The image in which light rays from one point on the object actually cross at the location of the image and can be projected onto a screen... |
Diffusion can occur across a semipermeable membrane, such as the cell membrane, as long as a what exists? | differential | polarity | parity | concentration gradient | Diffusion can occur across a semipermeable membrane, such as the cell membrane, as long as a concentration gradient exists. Molecules will continue to flow in this manner until equilibrium is reached. At equilibrium, there is no longer an area of high concentration or low concentration, and molecules flow equally in bo... |
Scientists use what scale to illustrate the order in which events on earth have happened? | cataclysmic time scale | ecological succession | fossil record | geologic time scale | Scientists use the geologic time scale to illustrate the order in which events on Earth have happened. |
What will happen if the gas particles inside an inflated balloon suddenly stop moving? | balloon inflates | balloon falls | balloon bursts | balloon deflates | Gas molecules also exert pressure. Earth’s atmosphere exerts pressure because gravity acts on the huge number of gas particles contained in the atmosphere, holding it in place. Pressure is also exerted by a small sample of gas, such as that which is contained in a balloon. Gas pressure is the pressure that results from... |
What are the major sites of gibberellin production? | stem and roots | flower and fruit | soil and leaves | young roots and leaves | |
What is required for interconversion between the two forms of an isomeric pair? | turn and reforming | couple and reforming | fixing and reforming | breaking and reforming | Stereoisomers Molecules with the same connectivity but different arrangements of the atoms in space are called stereoisomers. There are two types of stereoisomers: geometric and optical. Geometric isomers differ in the relative position(s) of substituents in a rigid molecule. (For more information on stereoisomers, see... |
Bacteria reproduce through what process, where the chromosome copies itself, forming two genetically identical copies? | nuclear fission | multiple fission | residual fission | binary fission | Bacteria reproduce through a process called binary fission . During binary fission, the chromosome copies itself, forming two genetically identical copies. Then, the cell enlarges and divides into two new daughter cells. The two daughter cells are identical to the parent cell. Binary fission can happen very rapidly. So... |
Water molecules are polar, so they form what type of bonds? | helium | carbon | oxygen | hydrogen | Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density. |
The cecum is the first part of what structure, where wastes in a liquid state enter from the small intestine? | appendix | duodenum | esophagus | large intestine | http://www. explainthatstuff. com/how-geiger-counters-work. html. |
What are the "levels" in a food chain or web called? | gauges | parts | root | trophic | Energy is passed up a food chain or web from lower to higher trophic levels. However, generally only about 10 percent of the energy at one level is available to the next level. This is represented by the ecological pyramid in Figure below . What happens to the other 90 percent of energy? It is used for metabolic proces... |
Are bones considered living or dead tissues? | dead | decaying | decomposing | living | From seeing a skeleton, you might think that bones are just dead, hollow structures. But in a living person, those hollow spaces are full of living cells. Bones have a blood supply and nerves. Bones are a living tissue. |
What forms when water in the atmosphere condenses on dust particles suspended in the air? | wind | hail | snow | clouds | |
What are the two types of fermentation? | lactic acid and fermaldehyde | acetic and anhydrous | alcoholic and alchemical | lactic acid and alcoholic | There are two types of fermentation: lactic acid fermentation and alcoholic fermentation. Both types of fermentation are described below. You can also watch animations of both types at this link: http://www. cst. cmich. edu/users/schul1te/animations/fermentation. swf . |
Aging occurs as cells lose their ability to do what? | join | grow | build | divide | During early adulthood, people form intimate relationships and start careers. Serious health problems start showing up in middle adulthood and old age. Aging occurs as cells lose their ability to divide. |
What is it called when liquid water falls from the sky? | erosion | sedimentation | water cycling | precipitation | |
Applying a pressure greater than the osmotic pressure of a solution will do what? | normal osmosis | ultrafiltration | osmosis | reverse osmosis | Figure 11.26 Applying a pressure greater than the osmotic pressure of a solution will reverse osmosis. Solvent molecules from the solution are pushed into the pure solvent. |
The molecule pictured above is thyroxine, a compound produced by which gland? | gallbladder | stomach | kidney | thyroid | The molecule pictured above is thyroxine, a compound produced by the thyroid gland. This molecule regulates how the body uses energy. In a condition known as hypothyroidism, the thyroid makes less thyroxine than normal. A person with this disease feels tired all the time and often puts on weight. Treatment with thyroid... |
Birds generally practice what kind of relationship, with both parents helping to care for the young? | homologous | carnivorous | synonomous | monogamous | Birds generally are monogamous, and both parents help to care for the young. |
Gravitropism ensures that roots grow into the soil and that shoots grow toward what? | the south pole | the north pole | trees | sunlight | Plant Responses to Gravity Whether or not they germinate in the light or in total darkness, shoots usually sprout up from the ground, and roots grow downward into the ground. A plant laid on its side in the dark will send shoots upward when given enough time. Gravitropism ensures that roots grow into the soil and that ... |
What is the mass of one mole of any given substance? | solute mass | atomic mass | protons mass | molar mass | Molar mass is the mass of one mole of any given substance. |
The corona surrounds which major object in our solar system? | Jupiter | Neptune | Earth's moon | the sun | The corona is the halo around the Sun. |
Respiration that occurs in the cells is called? | biological respiration | electromagnetic respiration | plasma respiration | cellular respiration | Another kind of respiration takes place within body cells. This kind of respiration is called cellular respiration. It’s the process in which cells obtain energy by “burning” glucose. Both types of respiration are connected. Cellular respiration uses oxygen and produces carbon dioxide. Respiration by the respiratory sy... |
Metabolism is an emergent property of life that arises from orderly interactions between what? | nutrients | tissues | body systems | molecules | |
During cellular respiration, carbons from the glucose molecule are changed back into what gas? | liquid dioxide | deformation dioxide | carbon monoxide | carbon dioxide | In biological systems, matter is continuously changing states as well. For example, carbon in the form of the gas carbon dioxide is changed into glucose, a solid. This change, of course, occurs during photosynthesis. During cellular respiration, carbons from the glucose molecule are changed back into the carbon dioxide... |
How does the distance between galaxies change as the universe expands? | it becomes irrelevant | it decreases | it is unchanged | it increases | Figure below shows a simple diagram of the expanding universe. Imagine a balloon covered with tiny dots. When you blow up the balloon, the rubber stretches. The dots slowly move away from each other as the space between them increases. In an expanding universe, the space between galaxies is expanding. We see this as th... |
Rainwater absorbs carbon dioxide (co 2 ) as it falls. the co 2 combines with water to form what? | methane gas | carbon monoxide | nitrate acid | carbonic acid | Rainwater absorbs carbon dioxide (CO 2 ) as it falls. The CO 2 combines with water to form carbonic acid. The slightly acidic water is especially good at dissolving the rock limestone. Groundwater creates landforms by dissolving away rock. |
Most molecular compounds that have a mass similar to water are in what state of matter at room temperature? | vapor | solid | liquid | gas | The hydrogen bonding that occurs in water leads to some unusual, but very important properties. Most molecular compounds that have a mass similar to water are gases at room temperature. Because of the strong hydrogen bonds, water molecules are able to stay condensed in the liquid state. The Figure below shows how the b... |
What do you call the movement of molecules across a membrane without the input of energy? | active transport | obvious transport | reactive transport | passive transport | Recall that the cell membrane is semipermeable. It does not allow everything to pass through. Some molecules can pass easily through your cell membranes, while others have more difficulty. Sometimes molecules need the help of special transport proteins to move across the cell membrane. Some molecules even need an input... |
Opposite charges attract and like charges do what? | impede | nothing | rebound | repulse | Opposite charges attract and like charges repulse. |
What molecules are usually insoluble in water? | ions | polar | acids | non-polar | Non-polar molecules are usually insoluble in water. |
What occurs when there is a sudden discharge of static electricity between a cloud and the ground? | rain | updraft | wind | lightning | Lightning occurs when there is a sudden discharge of static electricity between a cloud and the ground. |
If citrate accumulates in mitochondria, some of it passes into where and inhibits phosphofructokinase? | pores | Golgi apparatus | epidermis | cytosol | |
For most of a star’s life, hydrogen atoms fuse to form what? | gas atoms | neon atoms | ionic atoms | helium atoms | For most of a star’s life, hydrogen atoms fuse to form helium atoms. A star like this is a main sequence star . The hotter a main sequence star is, the brighter it is. A star remains on the main sequence as long as it is fusing hydrogen to form helium. |
What two ways do channels respond during membrane depolarization? | typically and sequentially | sequentially and identically | independently and typically | independently and sequentially | |
What kind of compound, contained in coffee and alcohol, increases urine volume? | additive | anabolic | acid | diuretic | Diuretics and Fluid Volume A diuretic is a compound that increases urine volume. Three familiar drinks contain diuretic compounds: coffee, tea, and alcohol. The caffeine in coffee and tea works by promoting vasodilation in the nephron, which increases GFR. Alcohol increases GFR by inhibiting ADH release from the poster... |
In mammals what does the zona pellucida protect? | fetus | testes | sperm | egg | Fertilization Fertilization, pictured in Figure 43.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. The egg and sperm each contain one set of chromosomes. To ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. In mammals, the eg... |
What type of vertebrates control body temperature to just a limited extent from the outside by changing behavior? | mimetic | etheric | endothermic | ectothermic | Early vertebrates were ectothermic. Ectothermy means controlling body temperature to just a limited extent from the outside by changing behavior. For example, an ectotherm might stay in the shade to keep cool on a hot, sunny day. On a cold day, an ectotherm might bask in the sun to warm up, like the snake in Figure bel... |
Worldwide, viruses seem to play a role in what percentage of the cases of human cancer? | 5% | 20 % | +.15 % | 15% | |
Elements are pure substances that make up what? | Solids | some matter | Objects | all matter | Elements are pure substances that make up all matter, so each one is given a unique name. The names of elements are also represented by unique one-, two-, or three- letter symbols. |
What reproductive part is stored in a plant's pollen? | the egg | the gamete | the mimic | the sperm | Plants can also reproduce sexually, but their reproductive organs are different from animals’ gonads. Plants that have flowers have their reproductive parts in the flower. The sperm is contained in the pollen, while the egg is contained in the ovary, deep within the flower. The sperm can reach the egg two different way... |
Atoms of what element ultimately form in a red supergiant? | coal | gold | steel | iron | In a red supergiant, fusion does not stop. Lighter atoms fuse into heavier atoms. Eventually iron atoms form. |
What are the two types of fats? | liquid and solid | thick and thin | full and empty | saturated and unsaturated | Fats may be either saturated or unsaturated. A saturated fat is a fat that consists of triglycerides whose carbon chains consist entirely of carbon-carbon single bonds. Therefore, the carbon chains are saturated with the maximum number of hydrogen atoms possible. An unsaturated fat is a fat that consists of triglycerid... |
What structure consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast? | cell wall | nucleus | cytoplasm | blastocyst | Blastocyst. The blastocyst consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast. The blastocyst fluid-filled cavity is also known as the blastocoel or blastocoele. |
Metabolic pathways are a series of reactions catalyzed by multiple what? | particles | hormones | vitamins | enzymes | Figure 4.11 Metabolic pathways are a series of reactions catalyzed by multiple enzymes. Feedback inhibition, where the end product of the pathway inhibits an upstream process, is an important regulatory mechanism in cells. |
What causes eutrophication to occur? | excess of increased and other nutrients | excess of decreased and other nutrients | excess of carbonate and other nutrients | excess of fertilizers and other nutrients | Fertilizer in runoff leads to algal blooms and dead zones in bodies of water. This type of pollution is called nonpoint-source pollution. Point-source pollution includes waste water from factories and sewage treatment plants. Hot water discharge causes thermal pollution. |
What do you call the separation of ions that occurs when a solid ionic compound dissolves? | dissolution | deformation | decomposition | dissociation | An ionic crystal lattice breaks apart when it is dissolved in water. Dissociation is the separation of ions that occurs when a solid ionic compound dissolves. It is important to be able to write dissociation equations. Simply undo the crisscross method that you learned when writing chemical formulas of ionic compounds.... |
What is light with wavelengths shorter than visible light called? | radio waves | weathering light | infrared light | ultraviolet light | Light with wavelengths shorter than visible light is called ultraviolet light . The term ultraviolet means “above violet. ” Ultraviolet light is the range of light waves that have shorter wavelengths and higher frequencies than violet light in the visible range of light. With higher frequencies than visible light, ultr... |
How much distance can beta particles travel through air? | density | centimeters | inches | meter | Beta particles can travel up to a meter through air. They can pass through paper and cloth but not through a sheet of aluminum. They can penetrate and damage tissues beneath the skin. |
What is created when the warm air at the cold front rises and creates a low pressure cell, causing winds to rush into the low pressure? | Wind pressure | Tornado | Hurricane | rising air column | The warm air at the cold front rises and creates a low pressure cell. Winds rush into the low pressure. This creates a rising column of air. The air twists, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. Since the rising air is moist, rain or snow falls. |
People with osteoporosis have an increase risk of what? | weight loss | cancer | muscle loss | bone fractures | People with osteoporosis have an increased risk of bone fractures. A bone fracture is a crack or break in bone. Even if you have healthy bones, you may fracture a bone if too much stress is placed on it. This could happen in a car crash or while playing a sport. Wearing a seatbelt when you ride in a motor vehicle and w... |
What is the main artery of the systematic circulation called? | carotid | femoral | subclavian | aorta | Blood Vessels The blood from the heart is carried through the body by a complex network of blood vessels (Figure 16.12). Arteries take blood away from the heart. The main artery of the systemic circulation is the aorta; it branches into major arteries that take blood to different limbs and organs. The aorta and arterie... |
The length that an object has travelled in one or multiple directions can also be called what? | range | axis | velocity | distance | The length traveled by an object moving in any direction or even changing direction is called distance. |
In animals, what process occurs only in germ cells, which are in the ovaries or testes? | reproduction | mitosis | electrolysis | meiosis | |
Which theory describes the benzene molecule and other planar aromatic hydrocarbon molecules as hexagonal rings of sp2-hybridized carbon atoms with the unhybridized p orbital of each carbon atom perpendicular to the plane of the ring? | molecular orbital theory | hybrid orbital theory | covalent bond theory | valence bond theory | Valence bond theory describes the benzene molecule and other planar aromatic hydrocarbon molecules as hexagonal rings of sp2-hybridized carbon atoms with the unhybridized p orbital of each carbon atom perpendicular to the plane of the ring. Three valence electrons in the sp2 hybrid orbitals of each carbon atom and the ... |
What type of carbon dioxide levels have been rising for the past several decades? | subatomic | magnetic | aqueous | atmospheric | Atmospheric carbon dioxide levels have been rising for the past several decades. |
Freezing rain that falls from the sky is also called? | fog | snowfall | hail | sleet | |
Do waves move faster when particles are close to each other or far away? | open | unaffected | far away | close | The speed of most waves depends on the medium through which they are traveling. Generally, waves travel fastest through solids and slowest through gases. That’s because particles are closest together in solids and farthest apart in gases. When particles are farther apart, it takes longer for the energy of the disturban... |
Adult bees include workers, a queen and what other type? | builders | laborers | soldiers | drones | Look at the honeybees in Figure below . Honeybees live in colonies that may consist of thousands of individual bees. Generally, there are three types of adult bees in a colony: workers, a queen, and drones. |
Name the law that determines as to which rock layers are younger or older than others. | law of apposition | law of gravity | geologic theory | law of superposition | In this lesson, you read how scientists determine the relative ages of sedimentary rock layers. The law of superposition determines which rock layers are younger or older than others. |
Since the electric field lines point radially away from the charge, they are perpendicular to what? | magnetic field lines | singularity lines | archetypical lines | equipotential lines | 19.4 Equipotential Lines We can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields. Of course, the two are related. Consider Figure 19.8, which shows an isolated positive point charge and its electric field lines. Electric field lines radiate out from a positive... |
What are in leaves that function as solar collectors and food factories? | fibroblasts | cellulose | vacuoles | chloroplasts | Leaves are rich in chloroplasts that function as solar collectors and food factories. The first leaves were very small, but leaves became larger over time. |
What is the process of producing eggs in the ovary is called? | morphogenesis | gametogenesis | meiosis | oogenesis | The process of producing eggs in the ovary is called oogenesis. Eggs, like sperm, are haploid cells, and their production occurs in several steps that involve different types of cells, as shown in Figure below . You can follow the process of oogenesis in the figure as you read about it below. |
What term refers to the deliberate prevention of pregnancy? | abortion | reproduction | cessation | contraception | |
Homologous chromosomes move toward what poles? | octogonal | interior | parallel | opposite | Homologous chromosomes move toward opposite poles of a dividing cell during. |
Why are the stems of many xerophytes fleshy? | collects water | drains water | pressures water | stores water | |
Most body fluids that you release from your body contain chemicals that kill pathogens. for example, mucus, sweat, tears, and saliva contain enzymes called? | sporozoans | lipids | enzymes | lysozymes | Most body fluids that you release from your body contain chemicals that kill pathogens. For example, mucus, sweat, tears, and saliva contain enzymes called lysozymes that kill pathogens. These enzymes can break down the cell walls of bacteria to kill them. |
What is at the top of the mesosphere? | Mesosphere | Troposphere | Stratosphere | mesopause | At the top of the mesosphere is the mesopause. Temperatures here are colder than anywhere else in the atmosphere. They are as low as -100° C (-212° F)! Nowhere on Earth’s surface is that cold. |
Yogurt is made from milk fermented with what type of organism? | algae | viruses | yeast | bacteria | Mom the Barbarian. Yogurt is made from milk fermented with bacteria . CC BY 2.0. |
What happens to an animal's telomeres as it ages? | multiply | divide | lengthen | shorten | As cells divide, their chromosomes get shorter. This is because the telomeres, the DNA sequences at both ends of a chromosome, lose material every time the DNA is replicated. The older the animal is, the shorter its telomeres will be, because of the number of cell cycles the cells have been through This is a natural pa... |
Characterized by uncontrolled growth, cancerous cells are also called what? | toxic | abnormal | benign | malignant | Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant cells. There are over 200 different known cancers that afflict humans. |
Historically, malaria has rivaled what as the leading cause of human death by infectious disease? | cancer | heart attack | hepatitis | tuberculosis | Alloys can be one of two general types. In one type, called a substitutional alloy, the various atoms simply replace each other in the crystal structure. In another type, called an interstitial alloy, the smaller atoms such as carbon fit in between the larger atoms in the crystal packing arrangement. |
When the number of electrons and the number of protons are equal, the object is what? | static | Negative | Positive | neutral | When the number of electrons and the number of protons are equal, the object is neutral. |
The angle of refraction depends on the index of what? | reflection | frequency | vibration | refraction | Refraction is responsible for dispersion in rainbows and many other situations. The angle of refraction depends on the index of refraction, as we saw in The Law of Refraction. We know that the index of refraction n depends on the medium. But for a given medium, n also depends on wavelength. (See Table 25.2. Note that, ... |
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