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What is a benefit of low sulfur coal over high sulfur coal? | less erosion | greater enerty | lower cost | less pollution | Low sulfur coal produces less pollution when burned than high sulfur coal. Name one factor that affects the sulfur content in coal. |
Wings of bats and birds serve the same function. which body part should you study to understand ancestral differences? | skin inside wings | skull size | skin and feathers | bones inside wings | Wings of bats and birds serve the same function. Look closely at the bones inside the wings. The differences show they developed from different ancestors. |
The best thermal conductors are also the best conductors of what, which is also related to the density of free electrons in them? | sound | light | pollution | electricity | Note that in Table 14.3, the best thermal conductors—silver, copper, gold, and aluminum—are also the best electrical conductors, again related to the density of free electrons in them. Cooking utensils are typically made from good conductors. |
What tissue do clubmosses have that mosses do not? | chorophyll | dioxide tissue | nuclei | vascular tissue | Clubmosses can resemble mosses; however, clubmosses have vascular tissue, while mosses do not. |
The average human body contains 5,830 g of what? | water | muscle | bacteria | blood | The average human body contains 5,830 g of blood. What mass of arsenic is present in the body if the amount in blood is 0.55 ppm?. |
What type of speciation occurs when groups from the same species are geographically isolated for long periods? | prokaryotic | asexual | symbiotic | allopatric | Allopatric speciation occurs when groups from the same species are geographically isolated for long periods. Imagine all the ways that plants or animals could be isolated from each other:. |
What can damage the hair cells lining the cochlea of the inner ear? | wavering sounds | amelodic sounds | unexpected sounds | loud sounds | Loud sounds can damage the hair cells lining the cochlea of the inner ear. Explain how this might affect the ability to hear sound. |
The boiling point of a solution is higher than the boiling point of the pure solvent, but the opposite occurs with this? | liquidity point | dissolving point | evaporation point | freezing point | The boiling point of a solution is higher than the boiling point of the pure solvent, but the opposite occurs with the freezing point. The freezing point of a solution is lower than the freezing point of the pure solvent. Think of this by assuming that solute particles interfere with solvent particles coming together t... |
What is the network of vessels and tissues that carry a clear fluid called lymph called? | cleansing system | excretory system | vessel system | lymphatic system | The lymphatic system is a network of vessels and tissues that carry a clear fluid called lymph. The lymphatic system ( Figure below ) spreads all around the body and filters and cleans the lymph of any debris, abnormal cells, or pathogens. Lymph vessels are tube-shaped, just like blood vessels, with about 500-600 lymph... |
What is defined as the change of water from its liquid phase to its gaseous phase? | transpiration | absorption | condensation | evaporation | |
Radiation, chemicals, and infectious agents are types of what? | dioxins | mutations | endogenous | mutagens | Types of mutagens include radiation, chemicals, and infectious agents. |
What type of matter transmits light without scattering it? | bioluminescent | translucent | clean | transparent | Transparent matter is matter that transmits light without scattering it. Examples of transparent matter include air, pure water, and clear glass. You can see clearly through a transparent object, such as the revolving glass doors in the figure, because all the light passes straight through it. |
Steam actually consists of tiny droplets of liquid what? | mercury | lead | methane | water | Steam actually consists of tiny droplets of liquid water. What you can’t see in the picture is the water vapor that is also present in the air above the spring. Water vapor is water in the gaseous state. It constantly rises up from the surface of boiling hot water. Why? At high temperatures, particles of a liquid gain ... |
What mammalian class has the greatest ability to learn? | rats | apes | reptiles | humans | In many ways, humans are unique among mammals. For example, we have bigger brains and a greater ability to learn than any other species in the mammalian class. In many ways, however, we are typical of the mammalian order to which we belong. That order is the Primate Order. To fully understand what it means to be human,... |
What is the part of the cardiovascular system that carries oxygen-rich blood away from the heart, to the body, and returns oxygen-poor blood back to the heart? | molecular circulation | peripheral nervous system | somatic system | systemic circulation | Systemic circulation is the part of the cardiovascular system that carries oxygen-rich blood away from the heart, to the body, and returns oxygen-poor blood back to the heart. Oxygen-rich blood leaves the left ventricle through the aorta. Then it travels to the body's organs and tissues. The tissues and organs absorb t... |
What causes polarization in a neutral object? | signaling of charges | meaning of charges | combining of charges | separation of charges | Charging by Induction It is not necessary to transfer excess charge directly to an object in order to charge it. Figure 18.13 shows a method of induction wherein a charge is created in a nearby object, without direct contact. Here we see two neutral metal spheres in contact with one another but insulated from the rest ... |
Cells in blood include red blood cells, white blood cells, and what? | plasmids | protons | droplets | platelets | Cells in blood include red blood cells, white blood cells, and platelets. |
What substance is created when a copper turns from reddish brown to greenish brown? | iron oxide | rust | copper alloy | copper oxide | A: Another example of matter changing color is a penny changing from reddish brown to greenish brown as it becomes tarnished. The color change indicates that a new chemical substance has been produced. Copper on the surface of the penny has combined with oxygen in the air to produce a different substance called copper ... |
The egg shell membrane encloses the nucleus containing the genetic material and what? | exoskeleton | cerebellum | enamel | cytoplasm | The ostrich egg - unfertilized, of course. Yes, this egg, just like a human ovum, is just one cell. It is a gamete with a haploid number of chromosomes, formed through meiosis. The egg shell membrane encloses the nucleus containing the genetic material and the cytoplasm. |
According to dalton's law, unless they chemically react with each other, individual gases in a mixture of gases do not affect each other’s what? | density | mass | weight | pressure | The Pressure of a Mixture of Gases: Dalton’s Law Unless they chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each individual gas in a mixture exerts the same pressure that it would exert if it present alone in the container (Figure 9.20). The pressure ex... |
How many mass distinctions have radically altered the history of life? | four | six | one | five | |
The vector sum of all the torques acting on an object is called what? | homeostasis | peak capacity | torque load | net torque | the net torque is the vector sum of all the torques acting on the object. When adding torques it is necessary to subtract CW from CCW torques. |
What determines how strongly an atom attracts electrons to itself? | gravity | enthalpy | ionization | electronegativity | The electronegativity of an atom determines how strongly it attracts electrons to itself. |
Looking directly at what celestial object can cause blindness? | Haley's Comet | Moon | earth | sun | The Sun has many incredible surface features. Don't try to look at them, though! Looking directly at the Sun can cause blindness. Find the appropriate filters for a pair of binoculars or a telescope and enjoy!. |
The amount of kinetic energy in a moving object depends directly on what two factors? | gravity and weight | revolution and velocity | inertia and momentum | mass and velocity | The amount of kinetic energy in a moving object depends directly on its mass and velocity. It can be calculated with the equation: . |
What is the movement of fluid out of the capillaries called? | osmosis | diffusion | absorption | filtration | 20.3 Capillary Exchange Small molecules can cross into and out of capillaries via simple or facilitated diffusion. Some large molecules can cross in vesicles or through clefts, fenestrations, or gaps between cells in capillary walls. However, the bulk flow of capillary and tissue fluid occurs via filtration and reabsor... |
The prevalence of cervical cancer in the united states is very low because of regular screening exams called what? | Stavros smears | prostates exams | mammograms | pap smears | The prevalence of cervical cancer in the United States is very low because of regular screening exams called pap smears. Pap smears sample cells of the cervix, allowing the detection of abnormal cells. If pre-cancerous cells are detected, there are several highly effective techniques that are currently in use to remove... |
There is a predictable amount of solute that can be dissolved at what? | room temperature | flat rate | light speed | specific temperature | There is a predictable amount of solute that can be dissolved at a specific temperature. |
Carrier proteins bind and carry the molecules across what cell structure? | plastid | nucleus | cell wall | cell membrane | Carrier proteins bind and carry the molecules across the cell membrane. These proteins bind a molecule on one side of the membrane, change shape as they carry the molecule across the membrane, and deposit the molecule on the other side of the membrane. Even though a protein is involved in both these methods of transpor... |
As per hutton's unconformity, what happened to the intermediate layers of rock? | they expanded | they metamorphized | they fused | they eroded away | Look at the rock layers pictured below ( Figure below ); they show a feature called Hutton’s unconformity. The unconformity was discovered by James Hutton in the 1700s. Hutton saw that the lower rock layers are very old. The upper layers are much younger. There are no layers in between the ancient and recent layers. Hu... |
What kind of summers do humid continental climates have? | wet summers | dry summers | warm summers | cold summers | Humid continental climates have warm winters and cold summers. Subarctic climates have cool short summers and very cold winters. |
Compared to others, what type of liquid has a relatively high surface tension and heat capacity? | blood | oil | wine | water | Compared to other liquids, water has a relatively high surface tension and heat capacity. Both of these properties are partially a result of the strong hydrogen bonds that hold water molecules together. |
Cilia and flagella are extensions of what? | cell wall | cell nucleus | protoplasm | plasma membrane | Cilia and flagella are extensions of the plasma membrane. |
Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals? | sulfuric heavy metals | gaseous heavy metals | alloys | toxic heavy metals | Toxic heavy metals include mercury and lead. Mercury is used in some industrial processes. It is also found in fluorescent light bulbs. Lead was once widely used in gasoline, paint, and pipes. It is still found in some products. |
During karyogamy, the haploid nuclei contributed by the two parents fuse, which produces what? | cancer cells | mutated cells | arisen cells | diploid cells | |
What is polyisoprene better known as? | silicon | rayon | styrofoam | rubber | Polyisoprene is a polymer of isoprene and is better known as rubber. It is produced naturally by rubber trees, but several variants have been developed which demonstrate improvements on the properties of natural rubber. |
Every chemical reaction occurs with a concurrent change in what? | hydrogen | neutrons | mass | energy | Every chemical reaction occurs with a concurrent change in energy. |
What receives blood in the heart? | the epidermis | chamber | ventricle | the atria | The atria receive blood and the ventricles pump blood out of the heart. |
Fatty acids, triglycerides, phospholipids, and steroids are examples of what? | proteins | tissues | enzymes | lipids | Lipids are a diverse class of relatively nonpolar biomolecules that generally do not dissolve well in water. Common types of lipids include fatty acids, triglycerides, phospholipids, and steroids. |
Where in the cell does photosynthesis occur? | pathogen | cell wall | genome | chloroplast | Photosynthesis occurs in the chloroplast of the plant cell. |
Sympathetic stimulation also triggers the release of epinephrine and norepinephrine, which enhance both cardiac output and what else? | digestion | vasodilation | inhibition | vasoconstriction | pressure and maintaining blood flow. Ultimately, however, blood volume will need to be restored, either through physiological processes or through medical intervention. In response to blood loss, stimuli from the baroreceptors trigger the cardiovascular centers to stimulate sympathetic responses to increase cardiac out... |
Not surprisingly, centipedes, millipedes and other members of the subphylum myriapoda are adapted to living on what? | tree | water | sand | land | Centipedes and millipedes belong to the subphylum Myriapoda, which contains 13,000 species. They all live on land, which makes sense as all those legs are more adapted to a terrestrial lifestyle, as opposed to an aquatic lifestyle. |
What are found in moist forests that break down decaying plant material? | organism | trichina | spirogyra | myriapoda | Myriapoda are usually found in moist forests, where they break down decaying plant material. |
By breaking down wastes and remains of dead organisms, decomposers perform what function in an ecosystem? | collecting | reproduction | symbiosis | recycling | Most prokaryotes get both energy and carbon from other living things. Many of them are decomposers. They break down wastes and remains of dead organisms. In this way, they help to recycle carbon and nitrogen through ecosystems. |
What are sugars broken down into in your digestive system? | nicotine | starch | insulin | glucose | Sugars are small, simple carbohydrates. They are found in foods such as milk and fruit. Sugars in foods such as these are broken down by your digestive system to glucose, the simplest of all sugars. Glucose is taken up by cells for energy. |
Approximately how many weeks does the fetal period last? | 27 weeks | 10 weeks | 25 weeks | 30 weeks | From the eighth week following fertilization until birth, the developing human being is called a fetus. Birth typically occurs at about 38 weeks after fertilization, so the fetal period generally lasts about 30 weeks. During this time, the organs complete their development. The fetus also grows rapidly in length and we... |
Because dizygotic twins develop from two eggs fertilized by two sperm, they are no more identical than siblings born at what? | other eras | other times of day | different places | different times | birth of dizygotic (or fraternal) twins. Because dizygotic twins develop from two eggs fertilized by two sperm, they are no more identical than siblings born at different times. Much less commonly, a zygote can divide into two separate offspring during early development. This results in the birth of monozygotic (or ide... |
What is the plasma membrane mainly composed of? | carbon | filaments | antibodies | phospholipids | The plasma membrane is composed mainly of phospholipids, which consist of fatty acids and alcohol. The phospholipids in the plasma membrane are arranged in two layers, called a phospholipid bilayer . As shown in Figure below , each phospholipid molecule has a head and two tails. The head “loves” water (hydrophilic) and... |
Astronomers have wondered if the universe is expanding fast enough to escape the pull of what? | light | kinetic energy | Coreolis effect | gravity | We know that the Universe is expanding. Astronomers have wondered if it is expanding fast enough to escape the pull of gravity. Would the Universe just expand forever? If it could not escape the pull of gravity, would it someday start to contract? This means it would eventually get squeezed together in a big crunch. Th... |
When someone falls, the kinetic energy the person has upon reaching the floor is the amount of what energy lost by falling through height? | nuclear energy | gravitational energy | thermal energy | potential energy | with a minus sign because the displacement while stopping and the force from floor are in opposite directions (cos θ = cos 180º = − 1) . The floor removes energy from the system, so it does negative work. The kinetic energy the person has upon reaching the floor is the amount of potential energy lost by falling through... |
What are protons and neutrons that make up the nucleus of an atom called? | electron shells | baryons | pions | nucleons | and Z, the atomic number, is the number of protons. The protons and neutrons that make up the nucleus of an atom are callednucleons, and an atom with a particular number of protons and neutrons is called anuclide. Nuclides with the same number of protons but different numbers of neutrons are called isotopes. Isotopes c... |
The sun, stars, moon, planets and comets are all type of what objects? | spacial | extraterrestrial | universal | celestrial | |
What is the total number of codons? | 68 | 45 | 51 | 64 | The mRNA is divided into three-base segments called codons. A codon is the segment of nucleotides that codes for an amino acid, or for a start or stop signal. There are 64 codons. |
Solution nodes and antinodes are both areas of wave interference, but they differ in the presence of what condition? | speed | radiation | gravity | motion | Check Your Understanding Define nodes and antinodes. Solution Nodes are areas of wave interference where there is no motion. Antinodes are areas of wave interference where the motion is at its maximum point. |
While similar to insects, what eight-legged invertebrates lack antennae or wings? | crustaceans | spiders | reptiles | arachnids | Arachnids do not have antennae or wings. |
How many chromosomes do mature gametes contain? | 17 | 19 | 13 | 23 | Spermatogenesis As just noted, spermatogenesis occurs in the seminiferous tubules that form the bulk of each testis (see Figure 27.4). The process begins at puberty, after which time sperm are produced constantly throughout a man’s life. One production cycle, from spermatogonia through formed sperm, takes approximately... |
What is the term for land that has permanently frozen soil? | Arctic | ice desert | snow-field | permafrost | Permafrost is land with permanently frozen soil. |
When sparks from a steel grinder react with oxygen, what do they form? | steel oxide | rust | spontaneous combustion | iron oxide | The sparks from a steel grinder are molten iron. The iron reacts with oxygen to form iron(III) oxide. |
What should you learn that allows you to recognize and avoid the dangers of specific hazards when experimenting, such as flames or broken glass? | first aid safety symbols | available safety symbols | medical safety symbols | lab safety symbols | Lab safety symbols warn of specific hazards, such as flames or broken glass. Knowing the symbols allows you to recognize and avoid the dangers. |
Motor vehicles account for almost half of the consumption of what? | electricity | hydrocarbon | greenhouse gases | fossil fuel | Motor vehicles account for almost half of fossil fuel use. Most vehicles run on gasoline, which comes from petroleum. |
Bacterial stis can be cured with what? | antiviral drugs | pesticides | antioxidants | antibiotics | Most STIs are caused by bacteria or viruses. Bacterial STIs can be cured with antibiotics. Viral STIs cannot be cured. Once you are infected with a viral STI, you are likely to be infected for life. |
Fats are also called triacylglycerols or triglycerides because of their what? | elemental type | atomic number | chemical weight | chemical structure | During this ester bond formation, three water molecules are released. The three fatty acids in the triacylglycerol may be similar or dissimilar. Fats are also called triacylglycerols or triglycerides because of their chemical structure. Some fatty acids have common names that specify their origin. For example, palmitic... |
What mammalian structure allows the exchange of gases, nutrients, and other substances between the fetus and mother? | notochord | uterus | mitochondria | placenta | Placenta of a Placental Mammal (Human). The placenta allows the exchange of gases, nutrients, and other substances between the fetus and mother. |
Fossil fuel consumption is a major contributor to global emissions of what gas? | methane | oxygen | carbon monoxide | carbon dioxide | Global carbon dioxide emissions from fossil fuel consumption and cement production. The black line represents all emission types combined. The colored lines show emissions from individual fossil fuels. |
What is the main function of blood? | excretion of waste | digestion | respiration | to transport | The main function of blood is transport. Blood in arteries carries oxygen and nutrients to all the body’s cells. Blood in veins carries carbon dioxide and other wastes away from cells to be excreted. Blood also transports the chemical messengers called hormones to cells throughout the body where they are needed to regu... |
Biotechnology is the use of biological agents for technological advancement. what two areas are the primary applications of this technology used? | medicine and philosophy | medicine and architecture | medicine and psychology | medicine and agriculture | Biotechnology is the use of biological agents for technological advancement. Biotechnology was used for breeding livestock and crops long before the scientific basis of these techniques was understood. Since the discovery of the structure of DNA in 1953, the field of biotechnology has grown rapidly through both academi... |
Unlike free-living species of flatworms that are predators or scavengers, what forms feed from the tissues of their hosts? | herbiverous | aquatic | mutualistic | parasitic | Flatworms The relationships among flatworms, or phylum Platyhelminthes, is being revised and the description here will follow the traditional groupings. Most flatworms are parasitic, including important parasites of humans. Flatworms have three embryonic germ layers that give rise to surfaces covering tissues, internal... |
When heat flows into an object, its thermal energy increases and so does its what? | color | matter | speed | temperature | When heat flows into an object, its thermal energy increases and so does its temperature. |
What are telescopes that use lenses to bend light called? | layering telescopes | reflecting telescopes | sliding telescopes | refracting telescopes | Telescopes that use lenses to bend light are called refracting telescopes , or refractors ( Figure below ). The earliest telescopes were all refractors. Many amateur astronomers still use refractors today. Refractors are good for viewing details within our solar system. Craters on the surface of Earth’s Moon or the rin... |
The science of analyzing tree rings is called what? | estradiol | algorithms | conservation | dendrochronology | |
Which type of arthritis causes the immune system to attack joints? | Spondylarthropathies | Osteoarthritis | Gout | rheumatoid | In rheumatoid arthritis, the immune system attacks joints. This causes joint damage and pain. |
A species is a subdivision of a genus in what classification system? | crocodilian system | calcareous system | mammalian | linnaean system | Linnaean Classification System: Classification of the Human Species. This chart shows the taxa of the Linnaean classification system. Each taxon is a subdivision of the taxon below it in the chart. For example, a species is a subdivision of a genus. The classification of humans is given in the chart as an example. |
What is the force that pulls particles at the exposed surface of a liquid toward other liquid particles called? | transfer tension | conservative tension | shinking tension | surface tension | Two unique properties of liquids are surface tension and viscosity. Surface tension is a force that pulls particles at the exposed surface of a liquid toward other liquid particles. Surface tension explains why water forms droplets, like the water droplet that has formed on the leaky faucet pictured in the Figure below... |
What state is achieved when the body's internal environment is kept more-or-less constant? | consciousness | cancerous | hypothesis | homeostasis | The organ systems of the body work together to carry out life processes and maintain homeostasis. The body is in homeostasis when its internal environment is kept more-or-less constant. For example, levels of sugar, carbon dioxide, and water in the blood must be kept within narrow ranges. This requires continuous adjus... |
Kinetic and potential are two forms of what? | exercise | pressure | fuel | energy | Energy is the ability to do work. When work is done, energy is transferred from one object to another. Energy can exist in different forms, such as electrical and chemical energy. Most forms of energy can also be classified as kinetic or potential energy. |
Humans are unique in their ability to alter their environment with the conscious purpose of increasing what, which acts as a limiting factor on populations in general? | niche | density dependent limitation | containing capacity | carrying capacity | Overcoming Density-Dependent Regulation Humans are unique in their ability to alter their environment with the conscious purpose of increasing its carrying capacity. This ability is a major factor responsible for human population growth and a way of overcoming density-dependent growth regulation. Much of this ability i... |
A desmosome is a cell structure that anchors the ends of what fibers together? | smooth muscle | skeletal muscle | controllable muscle | cardiac muscle | 30.5 Applications of Atomic Excitations and De-Excitations 30. Figure 30.39 shows the energy-level diagram for neon. (a) Verify that the energy of the photon emitted when neon goes from its metastable state to the one immediately below is equal to 1.96 eV. (b) Show that the wavelength of this radiation is 633 nm. (c) W... |
How much space a surface covers is known as what? | Height | Flatness | Lenght | area | The area of a surface is how much space it covers. It’s easy to calculate the area of a surface if it has a regular shape, such as the blue rectangle in the sketch below. You simply substitute measurements of the surface into the correct formula. To find the area of a rectangular surface, use this formula:. |
What do aquatic arthropods use to exchange gases? | diaphragm | lungs | pores | gills | Aquatic arthropods use gills to exchange gases. These gills have a large surface area in contact with the water, so they can absorb more oxygen. |
What kind of rays can travel thousands of meters through air and can penetrate and damage cells deep inside the body? | plasma rays | x-rays | cosmic rays | gamma rays | Alpha particles can travel only a few centimeters through air. They can burn the skin but not penetrate it. Beta particles can travel up to a meter through air. They can penetrate and damage skin. Gamma rays can travel thousands of meters through air. They can penetrate and damage cells deep inside the body. |
Of the three types of skeleton designs - hydrostatic skeletons, exoskeletons, and endoskeletons - which do humans possess? | exoskeleton | none of the above | hydrostatic skeleton | endoskeleton | CHAPTER SUMMARY 38.1 Types of Skeletal Systems The three types of skeleton designs are hydrostatic skeletons, exoskeletons, and endoskeletons. A hydrostatic skeleton is formed by a fluid-filled compartment held under hydrostatic pressure; movement is created by the muscles producing pressure on the fluid. An exoskeleto... |
What regulates homeostasis and basic survival behaviors? | cell membrane | hippocampus | mitosis | hypothalamus | |
What device changes kinetic energy to electrical energy through electromagnetic induction? | real generator | due generator | Emission generator | electric generator | An electric generator is a device that changes kinetic energy to electrical energy through electromagnetic induction. Electromagnetic induction is the process of generating electric current with a magnetic field. It occurs when a magnetic field and an electric conductor, such as a coil of wire, move relative to one ano... |
What are two nonliving things that all living things need for survival? | methane | sunlight | calcium | water and air | |
The fight or flight response involves what system? | voluntary nervous system | functional nervous system | cellular nervous system | autonomic nervous system | Figure 15.1 Fight or Flight? Though the threats that modern humans face are not large predators, the autonomic nervous system is adapted to this type of stimulus. The modern world presents stimuli that trigger the same response. (credit: Vernon Swanepoel). |
How many types of galaxies are there? | two | one | five | three | Galaxies are divided into three types, according to shape. There are spiral galaxies, elliptical galaxies, and irregular galaxies. Spiral galaxies are a rotating disk of stars and dust. In the center is a dense bulge of material. Several arms spiral out from the center. Spiral galaxies have lots of gas and dust and man... |
Skin color is controlled by genes but also influenced by exposure to what? | makeup | food | precipitation | sunlight | Genes play an important role in determining an organism's traits. However, for many traits, phenotype is influenced by the environment as well. For example, skin color is controlled by genes but also influenced by exposure to sunlight. You can see the effect of sunlight on skin in Figure below . |
Higher temperatures increase the rate of reaction in a lot of chemical reactions because they increase the frequency of what interaction between reactant particles? | waves | electric | explosions | collisions | Raising the temperature of a chemical reaction usually results in a higher rate of reaction. When the reactant particles are heated, they move faster and faster. This results in a greater frequency of collisions. A more important effect of the temperature increase is that the collisions occur with a greater force and a... |
Knees and elbows are examples of what part of the skeletal system? | nerves | cartilage | muscles | joints | As you age, you might start noticing pain in your knees or elbows. These are examples of joints. Joints are the part of the skeletal system that connect your bones. Joint pain is a common problem as people age. |
Einstein’s equation helps scientists understand what happens in nuclear reactions and why they produce so much what? | hydrogen | light | food | energy | Einstein’s equation helps scientists understand what happens in nuclear reactions and why they produce so much energy. When the nucleus of a radioisotope undergoes fission or fusion in a nuclear reaction, it loses a tiny amount of mass. What happens to the lost mass? It isn’t really lost at all. It is converted to ener... |
Ovulation is the release of an egg from the what? | vagina | fallopian tubes | cervix | ovary | Ovulation, the release of an egg from the ovary, occurs at about the midpoint of the cycle. This would be around day 14 of a 28 day cycle. The egg is swept into the fallopian tube. If sperm is present, fertilization may occur. As sperm can only survive in the fallopian tube for up to a few days, fertilization can only ... |
The process in which the nucleus divides is called what? | cytokinesis | meiosis | epistasis | mitosis | In eukaryotic cells, the nucleus divides before the cell itself divides. The process in which the nucleus divides is called mitosis. Before mitosis occurs, a cell’s DNA is replicated. This is necessary so that each daughter cell will have a complete copy of the genetic material from the parent cell. How is the replicat... |
What is used to recrystallize excess dissolved solute in a supersaturated solution? | fertilizer crystal | starter crystal | energy crystal | seed crystal | Some solutes, such as sodium acetate, do not recrystallize easily. Suppose an exactly saturated solution of sodium acetate is prepared at 50°C. As it cools back to room temperature, no crystals appear in the solution, even though the solubility of sodium acetate is lower at room temperature. A supersaturated solution i... |
Our bodies use what, primarily in the form of glucose, for our immediate energy needs - although they are not as energy dense or capable of long-term storage as lipids? | proteins | enzymes | electrolytes | carbohydrates | Opening Essay On July 11, 2003, the Food and Drug Administration amended its food labeling regulations to require that manufacturers list the amount of trans fatty acids on Nutrition Facts labels of foods and dietary supplements, effective January 1, 2006. This amendment was a response to published studies demonstratin... |
What part of the body do ants use to detect chemicals? | eyes | thorax | fins | antennae | Some animals communicate with scent. They release chemicals that other animals of their species can smell or detect in some other way. Ants release many different chemicals. Other ants detect the chemicals with their antennae. This explains how ants are able to work together. The different chemicals that ants produce h... |
Water has the properties of cohesion and what else? | diffusion | absorption | degradation | adhesion | Water has the properties of cohesion and adhesion. Define these two properties, and explain why they occur in water. |
Fitness and natural selection are parts of what theory that might describe how organisms change over time? | implementation | dessication | gravity | evolution | All of these animal behaviors are important. They help the animals get food for energy, make sure their young survive, or ensure that they, themselves, survive. Behaviors that help animals or their young survive, increase the animals’ fitness. Animals with higher fitness have a better chance of passing their genes on t... |
What three forces are involved in erosion? | radiation, gravity, precipitation | water, temperature, altitude | heat, pressure, gravity | water, wind, gravity | |
Thermodynamics do not give us any insight into what attribute of spontaneous processes? | increase | acceleration | decrease | rate | It should be noted that just because a process is spontaneous does not mean that it occurs quickly. The rusting of iron is a spontaneous process that takes place over a long period of time. The combustion of gasoline in oxygen (also a spontaneous process) is extremely fast when provided with a spark, but gasoline can b... |
What is the main source of hydrocarbons? | decomposers | photosynthesis | greenhouse gases | fossil fuels | Hydrocarbons are extremely important to modern life. Their most important use is as fuels. Hydrocarbons are also used to manufacture many products including plastics. The main source of hydrocarbons is fossil fuels. |
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