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Tendons connecting the scapula to the humerus form what, which is the circle of tendons around the shoulder joint? | thigh cuff | knee cuff | wrist cuff | rotator cuff | The rest of the shoulder muscles originate on the scapula. The anatomical and ligamental structure of the shoulder joint and the arrangements of the muscles covering it, allows the arm to carry out different types of movements. The deltoid, the thick muscle that creates the rounded lines of the shoulder is the major ab... |
The number of particles of a substance in a given volume is known as? | mass | frequency | range | concentration | Concentration is the number of particles of a substance in a given volume. When the concentration of reactants is higher, the reaction rate is faster. At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react. Did you ever see a sign like the one in Figur... |
Potential differences from various voltage sources are necessary in order to create electrical fields, which result in what flow of charge? | wattage | voltage | output | current | 20.2 Ohm’s Law: Resistance and Simple Circuits What drives current? We can think of various devices—such as batteries, generators, wall outlets, and so on—which are necessary to maintain a current. All such devices create a potential difference and are loosely referred to as voltage sources. When a voltage source is co... |
What effect is caused by air moving over the earth's surface as it spins? | dopple effect | pruett effect | mazinho effect | coriolis effect | Earth is spinning as air moves over its surface. This causes the Coriolis effect. Winds blow on a diagonal over the surface, instead of due north or south. From which direction do the northern trade winds blow?. |
The separation of compounds on the basis of their solubilities in a given solvent is known as what? | separate crystallization | nuclei crystallization | simplest crystallization | fractional crystallization | Solubility may increase or decrease with temperature; the magnitude of this temperature dependence varies widely among compounds. Notice in particular the curves for NH4NO3 and CaCl2. The dissolution of ammonium nitrate in water is endothermic (ΔHsoln = +25.7 kJ/mol), whereas the dissolution of calcium chloride is exot... |
What is the process by which wind blows to make the ground surface gets lower and rockier ? | layering | inflation | stagnation | deflation | Wind blows small particles away. As a result, the ground surface gets lower and rockier; this is called deflation . The rocks that are left are called desert pavement . Desert pavement is a surface covered by gravel-sized particles that are not easily moved by wind. |
Because trees add water vapor to air, cutting down forests leads to longer periods of what? | flooding | ice | harvest | drought | Water shortages are common in much of the world. People are most likely to run short of water during droughts. A drought is a period of unusually low rainfall. Human actions have increased how often droughts occur. One way people can help to bring on drought is by cutting down trees. Trees add a lot of water vapor to t... |
Some sea anemones establish what kind of relationship with hermit crabs by attaching to the crab’s shell? | predatory | pathogenic | parasitic | mutualistic | The mouth of a sea anemone is surrounded by tentacles that bear cnidocytes. The slit-like mouth opening and pharynx are lined by a groove called a siphonophore. The pharynx is the muscular part of the digestive system that serves to ingest as well as egest food, and may extend for up to two-thirds the length of the bod... |
Prokaryotic cells do not have a nucleus but instead generally have a single chromosome, a piece of double-stranded dna located in an area of the cell called the what? | spicule | lysosome | cytoplasm | nucleoid | The Prokaryotic Cell Recall that prokaryotes (Figure 22.10) are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus but instead generally have a single chromosome—a piece of circular, double-stranded DNA located in an area of the cell called the ... |
What measures a fluid’s resistance to flow? | surface tension | elasticity | density | viscosity | Viscosity measures a fluid’s resistance to flow – the higher the viscosity, the slower the flow of the material. One factor that affects viscosity is the strength of the intermolecular forces in the material. Molecules that exhibit higher intermolecular forces tend to have higher viscosities. Temperature also influence... |
What happens to the wire in a fuse if it's current rating is exceed? | sparks | disappears | ignites | it melts | The image above is one type of electrical fuse. This fuse has a specially designed wire inside glass housing. The wire inside the glass is made of a particular metal and with a particular thickness to give the wire an exact resistance. This resistance will allow passage of normal current plus a marginal percentage more... |
Polar climates include polar and which other kind of tundra? | tropic | mountains | arid | alpine | Polar climates include polar and alpine tundra. Polar Tundra in Northern Alaska (70° N latitude), Alpine Tundra in the Colorado Rockies (40° N latitude). |
What disease is given as an example of a sex-linked trait? | emphysema | arthritis | hypertension | hemophilia | Hemophilia is a sex-linked trait. Carrier mothers can pass along the affected allele to 50% of their sons. Females with hemophilia would have to receive an affected allele from each parent, making females with hemophilia rare. |
What type of feeders are earthworms? | oil | middle | top | deposit | Earthworms are deposit feeders. They burrow through the ground, eating soil and extracting organic matter from it. Earthworm feces, called worm casts, are very rich in plant nutrients. Earthworm burrows help aerate soil, which is also good for plants. |
What part of the plant is the main site of photosynthesis? | stem | soil | root | leaf | 30.4 Leaves Leaves are the main site of photosynthesis. A typical leaf consists of a lamina (the broad part of the leaf, also called the blade) and a petiole (the stalk that attaches the leaf to a stem). The arrangement of leaves on a stem, known as phyllotaxy, enables maximum exposure to sunlight. Each plant species h... |
Aluminosilicates are formed by replacing some of the si atoms in silicates by which atoms? | ad | fe | ce | al | character increases. Silicates contain anions that consist of only silicon and oxygen. Aluminosilicates are formed by replacing some of the Si atoms in silicates by Al atoms; aluminosilicates with threedimensional framework structures are called zeolites. Nitrides formed by reacting silicon or germanium with nitrogen a... |
In a smoke detector, a battery in the electric circuit creates what between the metal plates? | cooling | magnetism | hydrogen | voltage | Most of us have at least one device in our homes that guards our safety and, at the same time, depends on radioactivity to operate properly. This device is a smoke detector. A typical smoke detector contains an electric circuit that includes two metal plates about 1 cm apart. A battery in the circuit creates a voltage ... |
Photochemical smog consists mainly of what? | carbon | acid | oxygen | ozone | Secondary pollutants form from primary pollutants. Many occur as part of photochemical smog . This type of smog is seen as a brown haze in the air. Photochemical smog forms when certain pollutants have a chemical reaction in the presence of sunlight. Photochemical smog consists mainly of ozone (O 3 ). Ozone near the gr... |
What lizards can change colors based on the color of their surroundings? | Monitor | skink | geckos | chameleons | |
Lipids are organic compounds that consist of carbon, hydrogen, and? | helium | nitrogen | methane | oxygen | Lipids are organic compounds that consist of carbon, hydrogen, and oxygen. They are made up of fatty acids and other compounds. They provide cells with energy, store energy, and help form cell membranes. |
What do you call the force a machine applies to an object? | optimal force | premium force | drop force | output force | When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force. The output force may or may not be the same as the input force. The force you apply to the machine is applied over a given distance, call... |
In scientific terms, average acceleration is the rate at which what changes? | gravity | direction | volume | velocity | In everyday conversation, to accelerate means to speed up. The accelerator in a car can in fact cause it to speed up. The greater the acceleration, the greater the change in velocity over a given time. The formal definition of acceleration is consistent with these notions, but more inclusive. Average Acceleration Avera... |
Some atoms are more stable when they gain or lose an electron and form what? | protons | molecules | electrons | ions | Ions and Ionic Bonds Some atoms are more stable when they gain or lose an electron (or possibly two) and form ions. This fills their outermost electron shell and makes them energetically more stable. Because the number of electrons does not equal the number of protons, each ion has a net charge. Cations are positive io... |
Like a blanket on a sleeping person, greenhouse gases act as what for the planet? | Exterior Coverings | ventilation | plastic | insulation | Like a blanket on a sleeping person, greenhouse gases act as insulation for the planet. The warming of the atmosphere is because of insulation by greenhouse gases. Greenhouse gases are the component of the atmosphere that moderate Earth’s temperatures. |
What is the process in which a solid changes directly to a gas without going through the liquid state called? | Diffusion | vaporization | amplification | sublimation | Sublimation is the process in which a solid changes directly to a gas without going through the liquid state. Solid carbon dioxide is an example of a substance that undergoes sublimation. |
How many forces do objects on earth have acting on them at all times? | four | ten | three | two | More than one force may act on an object at the same time. In fact, just about all objects on Earth have at least two forces acting on them at all times. One force is gravity, which pulls objects down toward the center of Earth. The other force is an upward force that may be provided by the ground or other surface. |
How often does sperm develop in humans? | rarely | monthly | sporadically | continuously | |
Scientists found that the youngest rocks on the seafloor were where? | mid - ocean glaciers | trenches. | mid - ocean sediments | mid-ocean ridges | The scientists used geologic dating techniques on seafloor rocks. They found that the youngest rocks on the seafloor were at the mid-ocean ridges. The rocks get older with distance from the ridge crest. The scientists were surprised to find that the oldest seafloor is less than 180 million years old. This may seem old,... |
The reproductive tissues of male and female humans develop similarly in utero until a low level of the hormone testosterone is released from male what? | bladder | kidneys | liver | gonads | Human Reproductive Anatomy The reproductive tissues of male and female humans develop similarly in utero until a low level of the hormone testosterone is released from male gonads. Testosterone causes the undeveloped tissues to differentiate into male sexual organs. When testosterone is absent, the tissues develop into... |
Flatworms have a concentration of nerve tissue in the head end, which was a major step in the evolution of what organ? | kidney | liver | heart | brain | Flatworms have a concentration of nerve tissue in the head end. This was a major step in the evolution of a brain. It was also needed for bilateral symmetry. |
What type of energy travels through matter in wave form? | light | vibrational | magnetic | sound | Sound is a form of energy that travels in waves through matter. The ability to sense sound energy and perceive sound is called hearing . The organ that we use to sense sound energy is the ear. Almost all the structures in the ear are needed for this purpose. Together, they gather sound waves, amplify the waves, and cha... |
What speeds up chemical reactions inside cells? | electrodes | nucleus | inhibitors | catalysts | Living things depend on catalysts to speed up many chemical reactions inside their cells. Catalysts in living things are called enzymes. Enzymes may be extremely effective. A reaction that takes a split second to occur with an enzyme might take billions of years without it!. |
What atmosphere do gills help exchange gas in? | air | stratosphere | ecosystem | water | |
Community interactions are important factors in what? | natural resources | natural process | natural change | natural selection | A community is the biotic component of an ecosystem. It consists of the populations of all the species that live in the same area. Populations in communities often interact with each other. Community interactions are important factors in natural selection. They help shape the evolution of the interacting species. Types... |
The end of a pine tree branch bears the male cones that produce what? | the stigmas | the ovaries | oxygen | the pollen | John Haslam. The end of a pine tree branch bears the male cones that produce the pollen . CC BY 2.0. |
One seismogram indicates the distance to the what? | the moon | researchers | houses | epicenter | One seismogram indicates the distance to the epicenter. This is determined by the P-and S-wave arrival times. If a quake is near the seismograph, the S-waves arrive shortly after the P-waves. If a quake is far from the seismograph, the P-waves arrive long before the S-waves. The longer the time is between the P-and S-w... |
What is the process of creating complementary strands of mrna called? | differentiation | mutation | division | transcription | Overview of Transcription. Transcription uses the sequence of bases in a strand of DNA to make a complementary strand of mRNA. Triplets are groups of three successive nucleotide bases in DNA. Codons are complementary groups of bases in mRNA. Every triplet, or codon, encodes for a unique amino acid. |
In ancient egypt gold mines were the property of what? | people | prospectors | city | state | But mining for gold is a slow, dirty, and dangerous process. Not everyone owns a gold mine – in both the ancient Egyptian society and during the Roman Empire, the gold mines were the property of the state, not an individual or group. So there were few ways for most people to legally get any gold for themselves. |
The arid environment of a desert, for instance, can quickly deplete an animal of what? | air | strength | protein | water | |
What type of chemistry is the study of chemicals containing carbon called? | bioanalytical chemistry | inorganic chemistry | biochemistry | organic chemistry | Organic chemistry is the study of chemicals containing carbon. Carbon is one of the most abundant elements on Earth and is capable of forming a tremendously vast number of chemicals (over twenty million so far). Most of the chemicals found in all living organisms are based on carbon. |
What is the muscular organ shaped like an upside-down pear that has a thick lining of tissues called the endometrium? | liver | kidney | lungs | uterus | The uterus is a muscular organ shaped like an upside-down pear. It has a thick lining of tissues called the endometrium . The lower, narrower end of the uterus is known as the cervix . The uterus is where a fetus grows and develops until birth. During pregnancy, the uterus can expand greatly to make room for the baby a... |
What includes all the biotic and abiotic factors in an area and how they interact? | tundra | biome | habitat | ecosystem | An ecosystem is a unit of nature. It consists of all the biotic and abiotic factors in an area and all the ways in which they interact. |
What is used for cooling detectors of infrared telescopes? | carbon dioxide | hand nitrogen | material nitrogen | liquid nitrogen | Detecting Electromagnetic Waves from Space A final note on star gazing. The entire electromagnetic spectrum is used by researchers for investigating stars, space, and time. As noted earlier, Penzias and Wilson detected microwaves to identify the background radiation originating from the Big Bang. Radio telescopes such ... |
What do we call something that pushes or pulls on an object? | friction | reaction | annoyance | force | 4.1 Development of Force Concept Dynamics is the study of the forces that cause objects and systems to move. To understand this, we need a working definition of force. Our intuitive definition of force—that is, a push or a pull—is a good place to start. We know that a push or pull has both magnitude and direction (ther... |
Velocity is a vector that has both direction and what? | radiation | variable | latitude | magnitude | Because acceleration is velocity in m/s divided by time in s, the SI units for acceleration are m/s 2 , meters per second squared or meters per second per second, which literally means by how many meters per second the velocity changes every second. Recall that velocity is a vector—it has both magnitude and direction. ... |
What are the two classifications for organisms living in water? | scharwenka and plankton | arctan and nekton | arctan and plankton | nekton and plankton | Nekton are living things that swim through the water. They may live at any depth, in the photic or aphotic zone. Most nekton are fish, although some are mammals. Fish have fins and streamlined bodies to help them swim. Fish also have gills to take oxygen from the water. Figure below shows examples of nekton. |
Where are hotspot volcanoes commonly found? | streams | rivers | lakes | the ocean | Hotspot volcanoes are better able to penetrate oceanic crust than continental crust. We see many more hotspot volcanoes in the oceans. |
The muscles of the anterior compartment of the lower leg are generally responsible for dorsiflexion, and the muscles of the posterior compartment of the lower leg are generally responsible for this? | ganglion flexion | walking flexion | posterior flexion | plantar flexion | Figure 11.32 Muscles of the Lower Leg The muscles of the anterior compartment of the lower leg are generally responsible for dorsiflexion, and the muscles of the posterior compartment of the lower leg are generally responsible for plantar flexion. The lateral and medial muscles in both compartments invert, evert, and r... |
The presence of what, which acts as a trigger, affects the rate of chemical reaction? | light | friction | heat | catalyst | rates The rates at which reactants are consumed and products are formed during chemical reactions vary greatly. We can identify five factors that affect the rates of chemical reactions: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants... |
What do you call the splitting of the nucleus of an atom into two smaller nuclei? | cell division | critical fission | nuclear fusion | nuclear fission | Nuclear fission is the splitting of the nucleus of an atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. For example, nuclear fission of a tiny pellet of uranium-235, like the one pictured in Figure below , can release as much energy as burning 1,000 ... |
What method is used to map the earth on flat paper? | surveying | calculations | forecasts | projections | Earth is a round, three-dimensional ball. In a small area, Earth looks flat, so it is not hard to make accurate maps of a small place. When mapmakers want to map the round Earth on flat paper, they use projections. What happens if you try to flatten out the skin of a peeled orange? Or if you try to gift wrap a soccer b... |
Water molds mostly live in water or moist? | plants | cells | biomes | soil | Define physical change, and give examples of physical change. |
What is the act of noting or detecting phenomenon through the senses | overstimulation | sensory overload | invention | an observation | Scientists first make observations that raise questions. An observation is the act of noting or detecting phenomenon through the senses. For example, noting that a room is dark is an observation made through sight. |
What two measurements are multiplied to find the area of a rectangle? | length and depth | depth and width | volume and mass | length and width | Assume you are finding the area of a rectangle with a length of 6.8 m and a width of 6.9 m. When you multiply the length by the width on your calculator, the answer you get is 46.92 m 2 . Is this the correct answer? No; the correct answer is 46.9 m 2 . The correct answer must be rounded down so there is just one digit ... |
What is the term for biologically meaningful dna sequences? | babies | atoms | eggs | genes | disease is sex-linked and effects mainly males (who are XY, compared to XX females).273 In the unaffected population, the FMR-1 gene contains between 6 to 50 copies of a CGG repeat. Individuals with between 6 to 50 repeats are phenotypically normal. Those with 50 to 200 repeats carry what is known as a pre-mutation; th... |
Which common type of diabetes is also known as noninsulin-dependent or adult-onset diabetes? | juvenile diabetes | type 1 | gestational diabetes | type 2 | inner aspect of the atlas, where it is held in place by a ligament. Rotation at this joint allows you to turn your head from side to side. A second pivot joint is found at the proximal radioulnar joint. Here, the head of the radius is largely encircled by a ligament that holds it in place as it articulates with the rad... |
Recognition of pathogens is a function of what type of response? | hormones | digestion | inhalation | immune | Recognition of Pathogens Cells of the innate immune response, the phagocytic cells, and the cytotoxic NK cells recognize patterns of pathogenspecific molecules, such as bacterial cell wall components or bacterial flagellar proteins, using pattern recognition receptors. A pattern recognition receptor (PRR) is a membrane... |
Typically done to find food or mates, what do you call the regular movement of individuals or populations each year during certain seasons? | industrialization | emmigration | erosion | migration | Migration is another type of movement that changes population size. Migration is the regular movement of individuals or populations each year during certain seasons. The purpose of migration usually is to find food, mates, or other resources. For example, many northern hemisphere birds migrate thousands of miles south ... |
What is the vaccine to prevent infection of hpv? | herpes | cervical | HIV | gardasil | Infections with the human papillomavirus (HPV) are very common. HPV may cause genital warts , which are small, rough growths on the genitals. It may also cause cancer of the cervix in females. A simple test, called a Pap test , can detect cervical cancer . If the cancer is detected early, it usually can be cured with s... |
Mineral crystals that form when magma cools are usually _______ than crystals that form when lava cools. | smaller | older | denser | larger | Mineral crystals that form when magma cools are usually larger than crystals that form when lava cools. |
What element makes up the majority of coal? | silicon | iron | lead | carbon | Coal is a black or brownish-black rock that burns easily ( Figure below ). Most coal is sedimentary rock. The hardest type of coal, anthracite, is a metamorphic rock. That is because it is exposed to higher temperature and pressure as it forms. Coal is mostly carbon, but some other elements can be found in coal, includ... |
What do you call a simple machine consisting of a sloping surface that connects lower and higher elevations? | jack | lever | wedge | inclined plane | An inclined plane is a simple machine consisting of a sloping surface that connects lower and higher elevations. The ideal mechanical advantage of an inclined plane is always greater than 1. |
What can be combined with an amine to form an amide? | acetic acid | carbon dioxide | ketones | carboxylic acid | An amide can be formed by combining a carboxylic acid and an amine. Only primary and secondary amines can be used to form amides, since they have a hydrogen that can be replaced with the carbonyl carbon; tertiary amines will not form amides. The amide shown in the Figure above was formed from a carboxylic acid and a pr... |
There are about 50,000 vertebrate species, and they are placed in how many different classes? | three | four | ten | nine | There are about 50,000 vertebrate species, and they are placed in nine different classes. Five of the classes are fish. The other classes are amphibians, reptiles, birds, and mammals. Table below lists some of the distinguishing traits of each class. |
In which kind of species do open circulatory systems serve additional functions? | some earthworms | some apes | some seedlings | some invertebrates | |
Boyle’s law applies to matter which is in what state? | solids | liquids | plasma | gas | A piston having a certain pressure and volume (left piston) will have half the volume when its pressure is twice as much (right piston). One can also plot P versus V for a given amount of gas at a certain temperature; such a plot will look like the graph on the right. Boyle’s law is an example of a second type of mathe... |
What do we call heated groundwater that erupts from the ground under pressure? | volcanic eruptions | aquifers | spas | springs or geysers | |
Sensory organs that respond to particular sensory stimuli contain cells called what? | whole receptors | artificial receptors | stimulus receptor | sensory receptors | Sensory organs such as the eyes contain cells called sensory receptors that respond to particular sensory stimuli. |
How can we reduce use of energy resources? | modification | liberation | restoration | conservation | We can reduce our use of energy resources and the pollution they cause by conserving energy. Conservation means saving resources by using them more efficiently or not using them at all. Figure below shows several ways that people can conserve energy in their daily lives. You can find more energy-saving tips at the URL ... |
About 50% of all animal species died off between the mesozoic and which other era? | cretaceous | jurassic | precambrian | cenozoic | The most famous mass extinction was 65 million years ago. Between the Mesozoic Era and the Cenozoic Era, about 50% of all animal species died off. This mass extinction is when the dinosaurs became extinct. Most scientists think that the extinction was caused by a giant meteorite that struck Earth. The impact heated the... |
Transforming from a caterpillar to a butterfly requires a lot of what? | food | Water | fuel | energy | This caterpillar is busily munching its way through leaf after leaf. In fact, caterpillars do little more than eat, day and night. Like all living things, they need food to provide their cells with energy. The caterpillar will soon go through an amazing transformation to become a beautiful butterfly. These changes requ... |
What two cycles make up the female reproductive cycle? | digestive and menstrual | ovarian and cesarean | cervical and menstrual | ovarian and menstrual | Female Hormones The control of reproduction in females is more complex. The female reproductive cycle is divided into the ovarian cycle and the menstrual cycle. The ovarian cycle governs the preparation of endocrine tissues and release of eggs, while the menstrual cycle governs the preparation and maintenance of the ut... |
Uranium is an example of a non-renewable resource used to produce what type of power? | electrical | water | wind | nuclear | Some resources can’t be renewed. At least, they can’t be renewed fast enough to keep up with use. Fossil fuels are an example. It takes millions of years for them to form. We are using them up much more quickly. Elements that are used to produce nuclear power are also non-renewable resources. Uranium, for example, whic... |
One of the early signs of cell disease is this "leaking" of what into the body cells? | glucose | proteins | potassium ions | sodium ions | Potassium Concentration Glial cells, especially astrocytes, are responsible for maintaining the chemical environment of the CNS tissue. The concentrations of ions in the extracellular fluid are the basis for how the membrane potential is established and changes in electrochemical signaling. If the balance of ions is up... |
What does the moving piston in an engine turn? | brake | hammer | muffler | crankshaft | |
What type of chloride is a non-volatile material, but does not dissolve in water? | lead chloride | pink chloride | yellow chloride | silver chloride | Silver chloride is a non-volatile material, but does not dissolve in water. What effect will it have on the vapor pressure of water?. |
In general, objects expand in all directions as temperature does what? | decreases | stays the same | cycles | increases | Figure 13.11 In general, objects expand in all directions as temperature increases. In these drawings, the original boundaries of the objects are shown with solid lines, and the expanded boundaries with dashed lines. (a) Area increases because both length and width increase. The area of a circular plug also increases. ... |
Paddles and hammers are examples of simple machines that increase the distance over which force is applied, while reducing what? | intensity | momentum | gravity | strength | Examples of machines that increase the distance over which force is applied are paddles and hammers. Figure below explains how these machines work. In each case, the machine increases the distance over which the force is applied, but it reduces the strength of the applied force. |
What two things collide to cause gas pressure? | gas particles and a wave | gas particles and an electron | light particles and an object | gas particles and an object | Gas pressure is the result of collisions between gas particles and an object. |
Every human cell has the same what, and each cell has thousands of them? | ribosomes | chromosomes | DNA | genes | There are about 22,000 genes in every human cell. Does every human cell have the same genes? Yes. Does every human cell make the same proteins? No. In a multicellular organism, such as us, cells have specific functions because they have different proteins. They have different proteins because different genes are expres... |
What are a class of tetrapod vertebrates that produce amniotic eggs called? | insects | mammals | amphibians | reptiles | Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. They include crocodiles, alligators, lizards, snakes, and turtles. The reptile class is one of the largest classes of vertebrates. It consists of all amniotes except birds and mammals. |
What characteristic of reptile eggs allows them to be laid on land instead of in water? | they are circular | they are dry | they trap gas | they are amniotic | Reptile eggs are amniotic, so they can be laid on land instead of in water. |
What part of the rainforest commonly has ferns and other ground plants? | emergent layer | forest floor | canopy layer | understory | Ferns are common in the understory of the tropical rainforest. |
The primary function of insulin is to facilitate the uptake of what into body cells? | chloride | sucralose | water | glucose | Insulin The primary function of insulin is to facilitate the uptake of glucose into body cells. Red blood cells, as well as cells of the brain, liver, kidneys, and the lining of the small intestine, do not have insulin receptors on their cell membranes and do not require insulin for glucose uptake. Although all other b... |
Spindle fibers form between the centrioles during prophase i of what process? | photosynthesis | mitosis | hydrolysis | meiosis | Prophase I: Chromosomes form, and the nuclear membrane breaks down. Centrioles move to opposite poles of the cell. Spindle fibers form between the centrioles. Here’s what’s special about meiosis : Homologous chromosomes pair up! You can see this in Figure below . |
How many quarks are in each proton and neutron? | four | ten | five | three | Remember the quarks from the first page of this chapter? Quarks are even tinier particles of matter that make up protons and neutrons. There are three quarks in each proton and three quarks in each neutron. The charges of quarks are balanced exactly right to give a positive charge to a proton and a neutral charge to a ... |
What is the year cycle that sunspots occur? | 22 | 12 | 15 | 11 | The most noticeable magnetic activity of the Sun is the appearance of sunspots. Sunspots are cooler, darker areas on the Sun’s surface ( Figure below ). Sunspots occur in an 11-year cycle. The number of sunspots begins at a minimum. The number gradually increases to the maximum. Then the number returns to a minimum aga... |
When an unstable nucleus emits radiation and is transformed into the nucleus of other elements this is called? | fusion decay | naturally decay | explosive decay | radioactive decay | To balance a nuclear reaction. The two general kinds of nuclear reactions are nuclear decay reactions and nuclear transmutation reactions. In a nuclear decay reaction, also called radioactive decay, an unstable nucleus emits radiation and is transformed into the nucleus of one or more other elements. The resulting daug... |
What is manufactured and added to foods to preserve freshness? | protein | carbohydrates | vitamin c | trans fat | A type of lipid called trans fat is found in many processed foods. Trans fat is rare in nature but is manufactured and added to foods to preserve freshness. Eating foods that contain trans fat increases the risk of heart disease. Trans fat may be found in such foods as cookies, doughnuts, crackers, fried foods, ground ... |
Scientists think that stars and galaxies make up only a small part of the matter in the universe. what is the rest of the matter called? | cold matter | typical matter | light matter | dark matter | We see many objects out in space that emit light. This matter is contained in stars, and the stars are contained in galaxies. Scientists think that stars and galaxies make up only a small part of the matter in the universe. The rest of the matter is called dark matter . |
Why are noninfectious diseases not contagious? | they are inherited | they are contagious | they are viral | non-pathogen caused | Noninfectious diseases are not contagious because they are not caused by pathogens. Instead, they are caused by such factors as lifestyle choices, environmental toxins, or mutations. |
Organisms that "love" acids are known as what? | acid heads | acidophobes | acidic | acidophiles | Acidophiles are organisms that "love" acids. They live in very acidic environments, such as acid mine drainage. They are also found near vents of volcanoes. The most acidophilic archaeans can thrive at negative pH values. No other organisms can survive in such acidic conditions. |
Which enzyme is used in step three of the polymerase chain reaction because of it's ability to withstand high temperatures? | backronym polymerase | minocycline polymerase | carbon polumerase | taq polymerase | When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol "Δ" is often used to indicate that the reaction is to be heated. |
What do scientists use to study the deep without going to the seafloor? | ultrasound machines | drill rigs | telescopes | remotely operated vehicles | Sending humans to the seafloor is expensive and dangerous. Having to return humans safely to the surface limits what a mission can do. Remotely operated vehicles , or ROVs, allow scientists to study the deep without going to the seafloor. These small vehicles carry cameras and scientific instruments. ROVs were used to ... |
The hemisphere that is tilted away from the sun is cooler because it receives less what? | pollution | direct electrons | x-rays | direct rays | The hemisphere that is tilted away from the Sun is cooler because it receives less direct rays. As Earth orbits the Sun, the Northern Hemisphere goes from winter to spring, then summer and fall. The Southern Hemisphere does the opposite from summer to fall to winter to spring. When it is winter in the Northern hemisphe... |
Like the strings of cello, anything that vibrates produces waves of what? | sound | heating | light | energy | A: Like the strings of cello, anything that vibrates produces waves of energy that travel through matter. For example, when you throw a pebble into a pond, waves of energy travel from the pebble through the water in all directions. Like an incandescent light bulb, anything that glows consists of matter that produces li... |
The point in the titration at which an indicator changes color is called what? | chromatic point | zeta point | tipping point | end point | Acid–Base Titrations Because most common acids and bases are not intensely colored, a small amount of an acid– base indicator is usually added to detect the equivalence point in an acid–base titration. The point in the titration at which an indicator changes color is called theendpoint. The procedure is illustrated in ... |
On a hot, dry day, plants close their stomata to conserve what? | cold | sunlight | air | water | ART CONNECTION QUESTIONS 1. Figure 5.7 On a hot, dry day, plants close their stomata to conserve water. What impact will this have on photosynthesis?. |
What do you call the system of glands that release chemical messenger molecules into the bloodstream? | limbic system | homeostasis system | nervous system | endocrine system | The nervous system isn’t the only message-relaying system of the human body. The endocrine system also carries messages. The endocrine system is a system of glands that release chemical messenger molecules into the bloodstream. The messenger molecules are hormones. Hormones act slowly compared with the rapid transmissi... |
Reactant concentrations are highest at which part of a reaction? | concurrent | ending | middle | beginning | Reactant concentrations are highest at the beginning of a reaction. The plot of [C] versus tis a curve with a slope that becomes steadily less positive. |
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