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Abundant in unpolluted ponds and streams, planarians prey on smaller animals or feed on? | unidentified animals | algae | fungi | dead animals | |
What does parasitic mean? | symbiotic | mutual benefit | welcome guest | lives in host | Other types of flatworms are parasitic. That means they live inside another organism, called a host, in order to get the food and energy they need. For example, tapeworms have a head-like area with tiny hooks and suckers (known as the scolex ) that help the worm attach to the intestines of an animal host ( Figure below... |
What scientist constructed a tree diagram, separating living organisms into three domains? | Mendel | Gibbs | CT Fletcher | carl woese | Figure 1.17 This phylogenetic tree was constructed by microbiologist Carl Woese using data obtained from sequencing ribosomal RNA genes. The tree shows the separation of living organisms into three domains: Bacteria, Archaea, and Eukarya. Bacteria and Archaea are prokaryotes, single-celled organisms lacking intracellul... |
Most of the genes in the eukaryotic cell are found where? | the mitochondria | the vacuoles | the cell wall | the nucleus | |
What are known as the building blocks of proteins? | bases | organism acids | protein acids | amino acids | Introduction Since the rediscovery of Mendel’s work in 1900, the definition of the gene has progressed from an abstract unit of heredity to a tangible molecular entity capable of replication, expression, and mutation (Figure 15.1). Genes are composed of DNA and are linearly arranged on chromosomes. Genes specify the se... |
What are the three types of muscle tissue in the body? | proliferating , cardiac , smooth | spongy, cardiac, skeletal | topography , cardiac , smooth | skeletal, cardiac, smooth | 10.1 Overview of Muscle Tissues Muscle is the tissue in animals that allows for active movement of the body or materials within the body. There are three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscle. Most of the body’s skeletal muscle produces movement by acting on the skeleton. Cardiac mu... |
The white mountains in new hampshire are part of what province? | antarctic | montreal | geologic | appalachian | The White Mountains in New Hampshire are part of the Appalachian province. The mountains are only around 6,000 feet high. |
What is the ratio of the uncertainty to the measured value, multiplied by one-hundred called? | percent inconsistency | variable uncertainty | amount uncertainty | percent uncertainty | To express the uncertainty in a measurement, we can calculate percent uncertainty . Percent uncertainty is the ratio of the uncertainty to the measured value, multiplied by one-hundred. For instance, the percent uncertainty associated with the measurement of (52.9 ± 0.5 mL), would be. |
What is produced by the sebaceous glands? | progesterone | pheromone | sperm | sebum | Structures in the dermis include hair follicles and sebaceous glands, which produce sebum. |
What do you call vesicle transport into the cell? | dialysis | passive transport | metastasis | endocytosis | Vesicle transport into the cell is called endocytosis. The cell membrane engulfs the substance. Then a vesicle pinches off from the membrane and carries the substance into the cell. |
What are daily changes in the level of ocean water called? | currents | waves | floods | tides | Tides are daily changes in the level of ocean water. They are caused mainly by the pull of the Moon’s gravity on Earth and its oceans. The Sun’s gravity also influences tides. |
What is the name of the narrow tube that begins at the stomach and ends at the large intestine? | small tissues | small stomach | pancreas | small intestine | The small intestine is a narrow tube that starts at the stomach and ends at the large intestine. In adults, it’s about 7 meters (23 feet) long. Most chemical digestion and almost all nutrient absorption take place in the small intestine. |
What is the term for how close a measurement is to the true value? | correctness | frequency | validity | accuracy | Accuracy is how close a measurement is to the true value. For example, 66 mL is a fairly accurate measurement of the liquid in Figure above . |
What are the two most abundant elements in the universe? | oxygen and carbon | hydrogen and oxygen | nitrogen and carbon | hydrogen and helium | Hydrogen and helium are the most abundant elements in the universe. |
What is the term for a close relationship between two species in which at least one species benefits. | endosymbiosis | extosis | candiasis | symbiosis | Symbiosis is a close relationship between two species in which at least one species benefits. Types of symbiosis include mutualism, parasitism, and commensalism. |
Atomic emission spectra are produced when excited electrons return to what state? | side state | orbital state | work state | ground state | Atomic emission spectra are produced when excited electrons return to ground state. |
The lungs perform gas exchange using air and what fluid, which is coming and going from the heart? | saliva | mucus | water | blood | Blood Supply The major function of the lungs is to perform gas exchange, which requires blood from the pulmonary circulation. This blood supply contains deoxygenated blood and travels to the lungs where erythrocytes, also known as red blood cells, pick up oxygen to be transported to tissues throughout the body. The pul... |
In addition to glucose, what gas is used during cellular respiration? | nitrogen | methane | hydrogen | oxygen | Cellular respiration uses oxygen in addition to glucose. It releases carbon dioxide and water as waste products. Cellular respiration actually "burns" glucose for energy. However, it doesn't produce light or intense heat like burning a candle or log. Instead, it releases the energy slowly, in many small steps. The ener... |
Which germ layers are essential for animal embryos to grow and develop into a body? | cytoplasm and chloroplasm | histone and melatonin | keratinocytes , ectoderm , mesoderm | endoderm, ectoderm, mesoderm | The three germ layers are the endoderm, the ectoderm, and the mesoderm. Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body. The endod... |
Scrubbers and catalytic converters are examples of technologies that change what into harmless compounds? | mutations | contaminants | toxins | pollutants | Some of the pollutants from fossil fuels can be filtered out of exhaust before it is released into the air ( Figure below ). Other pollutants can be changed to harmless compounds before they are released. Two widely used technologies are scrubbers and catalytic converters. |
What is the weighted average of the masses of all isotopes of an element called? | weight mass | cell mass | light mass | atomic mass | The atomic mass is the weighted average of the masses of all isotopes of an element. |
The ability of a water spider to walk across a body of water is an example of what? | magnetism | high density | low gravity | surface tension | The surface tension of water is illustrated by a number of common occurrences. For example, water spiders are able to walk across bodies of water because of surface tension. Even though the spiders are denser than water, they do not sink, because the small amount of weight pressing down on the surface is not enough to ... |
What are compounds with the same molecular formula but different structures and properties called? | polymers | substrates | monomers | isomers | |
What happens when the blood cannot reach the heart because a blood vessel is blocked? | pass out | fast heart beat | heart burn | heart attack | A heart attack happens when the blood cannot reach the heart because a blood vessel is blocked. If cardiac muscle is starved of oxygen for more than roughly five minutes, it will die. Cardiac muscle cells cannot be replaced, so once they die, they are dead forever. Coronary heart disease is the leading cause of death o... |
What kind of solid is characterized by an unorganized and unpredictable structure? | porous | magnetic | aqueous | amorphous | When water freezes in a non-crystalline, amorphous form as frost, the water molecules are fixed in place, but not in a regular, repeating pattern. Frost and other amorphous solids are characterized by their unorganized and unpredictable structure. Because ice comes in both amorphous and crystalline forms, there are dif... |
An object with more mass has greater thermal energy than an object with less mass because it has more what? | gravity | molecules | ions | atoms | 5. Thermal energy is the energy of moving atoms of matter. All matter has thermal energy because atoms of all matter are constantly moving. An object with more mass has greater thermal energy than an object with less mass because it has more atoms. |
Ether molecules have an oxygen atom and can engage in hydrogen bonding with which other molecules? | lipids | carbon dioxides | proteins | water | Ether molecules have an oxygen atom and can engage in hydrogen bonding with water molecules. An ether molecule has about the same solubility in water as the alcohol that is isomeric with it. |
What basic structures of the nervous system innervate the muscles of the respiratory system and are responsible for controlling and regulating pulmonary ventilation? | ions | toxins | enzymes | neurons | Neurons that innervate the muscles of the respiratory system are responsible for controlling and regulating pulmonary ventilation. The major brain centers involved in pulmonary ventilation are the medulla oblongata and the pontine respiratory group (Figure 22.20). |
Pollutants in surface water can filter into the ground and enter a what? | combustion aquifer | hydro plant | turbine | groundwater aquifer | Pollutants in surface water can filter into the ground and enter a groundwater aquifer. Irrigation water can bring pesticides and other chemicals. Water can seep through landfills. Tanks of gasoline stored underground can leak. |
What is the most common cause of dwarfism? | retinopathy | deformity | hypothyroidism | achondroplasia | Whereas cystic fibrosis, Tay-Sachs, and phenylketonuria are all autosomal recessive disorders, achondroplasia is an autosomal dominant disorder. Achondroplasia is the most common cause of dwarfism in humans. Achondroplasia is a result of an autosomal dominant mutation in the fibroblast growth factor receptor gene 3 (FG... |
What describes how much matter is in a certain amount of space? | viscosity | volume | mass | density | Density describes how much matter is in a certain amount of space. Substances that have more matter packed into a given space have higher densities. The water in a drinking glass has the same density as the water in a bathtub or swimming pool. All substances have characteristic densities, which does not depend on how m... |
Axons pass what on to other cells? | calcium impulses | synthesis impulses | myelin impulses | nerve impulses | The cell body contains the nucleus and other organelles. Dendrites and axons connect to the cell body, similar to rays coming off of the sun. Dendrites receive nerve impulses from other cells. Axons pass the nerve impulses on to other cells. A single neuron may have thousands of dendrites, so it can communicate with th... |
Sister chromatids separate and move to opposite poles of the cell in the third phase of what process? | meiosis | cytokinesis | epistasis | mitosis | third phase of mitosis during which sister chromatids separate and move to opposite poles of the cell. |
What is the distance that sound waves travel in a given amount of time called? | force of sound | velocity of sound | momentum of sound | speed of sound | The speed of sound is the distance that sound waves travel in a given amount of time. The speed of sound in dry air at 20 °C is 343 meters per second. |
What would you call a relationship where the bacteria benefit and and the other organism is harmed? | symbiotic | pathology | fungi | parasitism | Other bacteria are parasitic and can cause illness. In parasitism , the bacteria benefit, and the other organism is harmed. Harmful bacteria will be discussed in another concept. |
What is the supply of water to land or crops to help growth called? | precipitation | drainage | absorbtion | irrigation | Some of the problems associated with intensive irrigation include all but. |
What form of matter has neither a definite shape nor a definite volume? | liquid | plasma | solid | gas | A gas is a form of matter that has neither a definite shape nor a definite volume. A gas takes up the shape and volume of its container. This is because the particles of a gas are very far apart from one another compared to the particles that make up solids and liquids. Gases are easily compressed because of the large ... |
Which stage has already been completed by the time sea urchin eggs are released from the female? | mitoses | fetus | secondary | meiosis | |
Unlike pure substances, mixtures have a what? | complex composition | efficient composition | unique composition | variable composition | When two or more pure substances are combined together, a mixture is formed. Unlike pure substances, mixtures have a variable composition. Variable composition indicates that the relative proportions of the mixtures components may vary, and they can be separated by physical methods. There are two main types of mixtures... |
What process does not cause a rock to melt completely, instead causing the minerals to change by heat or pressure? | igneous extrusion | sedimentation | oxidation | metamorphism | Metamorphism does not cause a rock to melt completely. It only causes the minerals to change by heat or pressure. |
A disaccharide is a pair of monosaccharides. disaccharides are formed via dehydration synthesis, and the bond linking them is referred to as a glycosidic bond (glyco- = “sugar”). three disaccharides (shown in figure 2.19) are important to humans. these are sucrose, commonly referred to as table sugar; lactose, or milk ... | sucralose | fruit sugar | saccharin | malt sugar | Disaccharides A disaccharide is a pair of monosaccharides. Disaccharides are formed via dehydration synthesis, and the bond linking them is referred to as a glycosidic bond (glyco- = “sugar”). Three disaccharides (shown in Figure 2.19) are important to humans. These are sucrose, commonly referred to as table sugar; lac... |
At what age is skeletal maturity reached by humans? | 15 | 40 | 30 | 20 | Bones become increasingly ossified and grow larger during fetal development, childhood, and adolescence. When skeletal maturity is reached at about age 20, no additional growth in bone length can occur. |
What is most of earth's surface covered with? | silicon | insects | sand | water | The outer planets in the solar system are giant balls of swirling gas. Earth and the other inner planets are relatively small, dense, and rocky. Most of Earth’s surface is covered with water. As far as we know, Earth is also the only planet that has liquid water. Earth's atmosphere has oxygen. The water and oxygen are ... |
What is the sac-like organ of the body that is important for both mechanical and chemical digestion? | spleen | gall bladder | kidney | stomach | The stomach is a sac-like organ in which food is further digested both mechanically and chemically. (To see an animation of how the stomach digests food, go to the link below. ) Churning movements of the stomach’s thick, muscular walls complete the mechanical breakdown of food. The churning movements also mix food with... |
All chemical reactions require what to get started? | primary energy | conductivity energy | spiked energy | activation energy | Some chemical reactions release energy, whereas other chemical reactions absorb energy. All chemical reactions require activation energy to get started. |
Mitosis is nuclear division during which duplicated chromosomes are segregated and distributed into what? | woman nuclei | father nuclei | long nuclei | daughter nuclei | Figure 6.3 A cell moves through a series of phases in an orderly manner. During interphase, G1 involves cell growth and protein synthesis, the S phase involves DNA replication and the replication of the centrosome, and G2 involves further growth and protein synthesis. The mitotic phase follows interphase. Mitosis is nu... |
Movement of water and minerals in the xylem solutes, pressure, gravity, and matric potential are all important for what? | increase water transport | produce water transport | Moving Water Transport | plant water transport | Movement of Water and Minerals in the Xylem Solutes, pressure, gravity, and matric potential are all important for the transport of water in plants. Water moves from an area of higher total water potential (higher Gibbs free energy) to an area of lower total water potential. Gibbs free energy is the energy associated w... |
The temperature of the box is related to the average speed of what? | earth | air | light | molecules | The temperature of the box is related to the average speed of the molecules. Use momentum principles to relate temperature to pressure. Explain conceptually, in words rather than with equations. |
What are organisms that eat just one type of food? | devotees | gluttons | hedonists | specialists | Specialists are organisms that eat just one type of food. Birds that are specialists include ospreys, which eat only live fish. You can see an osprey in Figure below . The osprey’s feet are very well-adapted for catching fish. Its eyes are also well-adapted for seeing fish under the water. Its beak is well suited for g... |
Mechanisms for establishing cellular asymmetries include morphogen gradients, localized determinants, and what other type of interactions? | electromagnetic | reductive | conductive | inductive | |
Biodiversity hot spots are prime candidates for protection because they are prone to what species fate? | accumulation | mutation | reduction | extinction | |
What are single-celled or colonial organisms that do not have membranebound nuclei? | eukaryotes | arthropods | viruses | prokaryotes | Watch this video (http://openstaxcollege. org/l/rotating_DNA) that animates the three-dimensional structure of the DNA molecule shown in Figure 1.15. Some cells contain aggregates of macromolecules surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of... |
Differences in density between water and air lead to differences in what? | energy | resistance | sound | pressure | Differences in density between water and air lead to differences in pressure. |
What organizational tool, arguably the best in all of science, lists all the known chemical elements, arranged by atomic number? | spreadsheet | tide table | logic table | periodic table | Appendix: Periodic Table of the Elements In this chapter, we present some data on the chemical elements. The periodic table, introduced in Chapter 3 "Atoms, Molecules, and Ions", lists all the known chemical elements, arranged by atomic number (that is, the number of protons in the nucleus). The periodic table is argua... |
Solvation involves surrounding ions with what? | passive particles | proteins | molecules | solvent particles | Solvation involves surrounding ions with solvent particles. |
The appendicular skeleton includes all bones of the upper and lower limbs, plus the bones that attach each limb to the what? | compressed skeleton | literal skeleton | dynamic skeleton | axial skeleton | The Appendicular Skeleton The appendicular skeleton includes all bones of the upper and lower limbs, plus the bones that attach each limb to the axial skeleton. There are 126 bones in the appendicular skeleton of an adult. The bones of the appendicular skeleton are covered in a separate chapter. |
Cow manure can have a second life as a source of what gas? | ethanol | freon | hydrogen | methane | Cow manure can have a second life as a source of methane gas, which can be converted to electricity. Not only that food scraps can also be converted into green energy. |
Eggs reside in the mesohyl, but sperm are carried out of the sponge by what? | ion channels | air current | phloem | water current | |
Population size influences the chances of a species surviving, with very small populations generally at greatest risk of what fate? | mutation | adaptation | accumulation | extinction | Population size is the number of individuals in a population. For example, a population of insects might consist of 100 individual insects, or many more. Population size influences the chances of a species surviving or going extinct. Generally, very small populations are at greatest risk of extinction. However, the siz... |
Sound is the transfer of energy from a vibrating object in waves that travel through what? | water | light | time | matter | Sound is the transfer of energy from a vibrating object in waves that travel through matter. |
Sterols are a subgroup of what? | antibiotics | nuclides | nutrients | steroids | Steroids (or sterols) have several functions. Sterols are a subgroup of steroids. The sterol cholesterol is an important part of cell membranes and plays other vital roles in the body. Cholesterol is a precursor to fat-soluble vitamins and steroid hormones. Steroid hormones include the male and female sex hormones. Ste... |
Cardiac muscle is only found where? | abdomen | lung | brain | heart | Cardiac muscle also contracts and gets shorter. This muscle is found only in the heart. The sudden burst of contraction forces blood throughout your body. When the cardiac muscle relaxes, the heart fills with blood. This rhythmic contraction must continue for your whole life, luckily the heart muscle never gets tired. ... |
What process provides over 99 percent of the energy for life on earth? | fracking | farming | glycolysis | photosynthesis | Photosynthesis provides over 99 percent of the energy for life on earth. A much smaller group of autotrophs - mostly bacteria in dark or low-oxygen environments - produce food using the chemical energy stored in inorganic molecules such as hydrogen sulfide, ammonia, or methane. While photosynthesis transforms light ene... |
Unlike energy, what doesn’t need to be constantly added to ecosystems because it is recycled through ecosystems? | vapor | water | nutrients | matter | Unlike energy, matter doesn’t need to be constantly added to ecosystems. Instead, matter is recycled through ecosystems. Water and elements such as carbon and nitrogen that living things need are used over and over again. |
A colloid is a homogeneous mixture with medium-sized what? | molecules | atoms | solutions | particles | A colloid is a homogeneous mixture with medium-sized particles. Examples include homogenized milk and gelatin. The particles of a colloid are large enough to reflect light, so you can see them. But they are too small to settle or filter out of the mixture. |
What causes rivers to always flow downhill? | diffusion | slope | pressure | gravity | Currents are like rivers flowing through the ocean. Rivers always flow downhill because of gravity. What do you think causes ocean currents to flow?. |
What elements do water and hydrogen peroxide consist of? | hydrogen and helium | carbon and oxygen | calcium and oxygen | hydrogen and oxygen | Look at the Figure below of water (H 2 O) and hydrogen peroxide (H 2 O 2 ), and read about these two compounds. Both compounds consist of hydrogen and oxygen, but they have different ratios of the two elements. As a result, water and hydrogen peroxide are different compounds with different properties. If you’ve ever us... |
Name the virus that causes cold sores. | AIDS | Epstein-Barr | eboli | herpes virus | Metju12. Cold sores are caused by a herpes virus . Public Domain. |
Cardiac veins parallel the small cardiac arteries and generally drain into what sinus? | heart | Veins | lungs | coronary | CHAPTER REVIEW 19.1 Heart Anatomy The heart resides within the pericardial sac and is located in the mediastinal space within the thoracic cavity. The pericardial sac consists of two fused layers: an outer fibrous capsule and an inner parietal pericardium lined with a serous membrane. Between the pericardial sac and th... |
What is a dip slip fault where the dip of the fault plane is vertical? | incline slip | strike - theory | reverse slip | strike-slip | A strike-slip fault is a dip-slip fault where the dip of the fault plane is vertical. Strike-slip faults result from shear stresses. If you stand with one foot on each side of a strike-slip fault, one side will be moving toward you while the other side moves away from you. If your right foot moves toward you, the fault... |
The major entrance and exit for the respiratory system is which facial orifice? | mouth | pore | ear | nose | The Nose and its Adjacent Structures The major entrance and exit for the respiratory system is through the nose. When discussing the nose, it is helpful to divide it into two major sections: the external nose, and the nasal cavity or internal nose. The external nose consists of the surface and skeletal structures that ... |
Sexual reproduction is the combination of (usually haploid) reproductive cells from two individuals to form a third (usually diploid) unique offspring. sexual reproduction produces offspring with novel combinations of what? | phenotypes | features | cells | genes | Sexual Reproduction Sexual reproduction is the combination of (usually haploid) reproductive cells from two individuals to form a third (usually diploid) unique offspring. Sexual reproduction produces offspring with novel combinations of genes. This can be an adaptive advantage in unstable or unpredictable environments... |
What kind of reproduction involves just one parent and produces offspring genetically identical to each other and to the parent? | microscopic reproduction | sexual reproduction | organic reproduction | asexual reproduction | Asexual reproduction is simpler than sexual reproduction. It involves just one parent. The offspring are genetically identical to each other and to the parent. All prokaryotes and some eukaryotes reproduce this way. There are several different methods of asexual reproduction. They include binary fission, fragmentation,... |
What do you call the hard case that surrounds the soft parts of some animals? | membrane | muscles | shell | exoskeleton | |
Choosing to not smoke and using sunscreen are examples of lifestyle choices that help prevent forms of what disease? | viral disease | pnemonia | bacterial disease | cancer | Making healthy lifestyle choices can help prevent some types of cancer. For example, you can reduce your risk of lung cancer by not smoking. You can reduce your risk of skin cancer by using sunscreen (see Figure below ). |
What is said about the speed of rotation in systems that create tornadoes? | it is fast | it is magnetic | it is unchanged | it is slow | There are several other examples of objects that increase their rate of spin because something reduced their moment of inertia. Tornadoes are one example. Storm systems that create tornadoes are slowly rotating. When the radius of rotation narrows, even in a local region, angular velocity increases, sometimes to the fu... |
In gas exchange, oxygen flows into the blood, and what flows out? | liquid dioxide | naturally dioxide | carbon monoxide | carbon dioxide | Gas exchange is the movement of oxygen into the blood and carbon dioxide out of the blood. |
What happens during the process of digestion? | regurgitation | excretion of food | cell division | breakdown of food | The digestive system consists of organs that break down food, absorb nutrients, and eliminate waste. The breakdown of food occurs in the process of digestion. |
What do you call the folded layers of rock where geologists look for oil? | crests | oscillations | synclines | anticlines | Geologists look for oil in folded layers of rock called anticlines. Oil moves through permeable rock and is trapped by the impermeable cap rock. |
Cutting forests and clearing land has also increased the amount of what in the atmosphere? | pesticides | oxygen | smog | carbon dioxide | Because of human activities, there is more carbon dioxide in the atmosphere today than in the past hundreds of thousands of years. Burning fossil fuels and has released great quantities of carbon dioxide into the atmosphere. Cutting forests and clearing land has also increased carbon dioxide into the atmosphere because... |
Microevolution occurs in a population when what frequencies change over time? | antenna | eukaryote | molecule | allele | Microevolution occurs in a population when its allele frequencies change over time. There are four major forces of evolution that cause allele frequencies to change: mutation, gene flow, genetic drift, and natural selection. |
What is the alkaline hydrolysis reaction of an ester called? | resorption | instantiation | fermentation | saponification | Saponification describes the alkaline hydrolysis reaction of an ester. The term saponification originally described the hydrolysis of long-chain esters called fatty acid esters to produce soap molecules, which are the salts of fatty acids. One such soap molecule is sodium stearate, formed from the hydrolysis of ethyl s... |
What is the time interval required for one complete wave to pass a point called? | half-life | cycle | minute | period | The time interval required for one complete wave to pass a point is called the period . During the period of the wave, an entire wavelength from one crest to the next crest passes a position. The number of waves that pass a single position in one second is called the frequency . The period of a wave and its frequency a... |
Plant-like protists are autotrophs, meaning they make their own what? | molds | spores | flowers | food | Plant-like protists are autotrophs, meaning they make their own food. |
In what form do plants and animals store sugar for later use? | carrying polysaccharides | processing polysaccharides | management polysaccharides | storage polysaccharides | |
What forces the fetus out of the uterus? | deep breathing | biological clock | delayed childbirth | continuous strong contractions | |
The large and small intestine are both divided into how many parts? | 2 | 6 | 8 | 3 | From the small intestine, any remaining food wastes pass into the large intestine. The large intestine is a relatively wide tube that connects the small intestine with the anus. Like the small intestine, the large intestine also consists of three parts: the cecum (or caecum), colon, and rectum. Follow food as it moves ... |
If everything in a system stays the same but the pressure deceases, gas bubbles will change in what way? | they get smaller | they multiply | they pop | they get bigger | Gas bubbles get bigger when they are under less pressure. |
What do you call the transfer of thermal energy? | precipitation | formation | humidity | heat | Thermal energy is the total energy of moving particles of matter. The transfer of thermal energy is called heat. Therefore, a heating system is a system for the transfer of thermal energy. Regardless of the type of heating system in a home, the basic function is the same: to produce thermal energy and transfer it to ai... |
The outer layer of what anatomical structure is so tough that it keeps out most pathogens? | bark | liver | steel | skin | This drawing shows that the skin has many layers. The outer layer is so tough that it keeps out most pathogens. |
The process of a liquid becoming a gas is called boiling, while the process of a solid becoming a gas is called what? | Melting | vaporization | Boiling | sublimation | Temperature does not change during a phase change. The process of a liquid becoming a gas is called boiling; the process of a solid becoming a gas is called sublimation. |
How does the nucleus divide during nuclear fission? | equally | evenly | biochemically | asymmetrically | Collision of a relatively slow-moving neutron with a fissile nucleus can split it into two smaller nuclei with the same or different masses. Neutrons are also released in the process, along with a great deal of energy. Any isotope that can undergo a nuclear fission reaction when bombarded with neutrons is called a fiss... |
How do heavy alkanes affect the skin? | color the skin | they do not affect the skin | damage the skin | form a protective layer | Lighter alkanes wash away protective skin oils; heavier alkanes form a protective layer. |
If an electric current passes through water, water molecules break down into molecules of what? | oxygen and methane | carbon and oxygen | hydrogen and carbon | hydrogen and oxygen | The arrow in Figure above shows that the reaction goes from left to right, from hydrogen and oxygen to water. The reaction can also go in the reverse direction. If an electric current passes through water, water molecules break down into molecules of hydrogen and oxygen. This reaction would be represented by a right-to... |
What makes luminous dials glow in the dark? | eerie substances | polymer substances | devil substances | phosphorescent substances | Once excited, an atom or molecule will usually spontaneously de-excite quickly. (The electrons raised to higher levels are attracted to lower ones by the positive charge of the nucleus. ) Spontaneous de-excitation has a very short mean lifetime of −8 typically about 10 s . However, some levels have significantly longer... |
What liquid is referred to as the "universal solvent"? | blood | bromine | gasoline | water | Not only salt, but many other solutes can dissolve in water. In fact, so many solutes can dissolve in water that water has been called the universal solvent. Even rocks can dissolve in water, which explains the cave that opened this article. A solute that can dissolve in a given solvent, such as water, is said to be so... |
What is the active ingredient in cloves? | thiamine | nicotine | methyl | eugenol | Eugenol, the active ingredient in cloves, has the formula C 10 H 12 O 2 . Eugenol is a molecular substance that does not dissociate into ions when dissolved in a solvent. What is the boiling point of a solution in which 0.144 g of eugenol is dissolved in 10.0 g benzene? The k b value for benzene is 2.53 °C/ m , and the... |
What term means the adjusting of systems within a cell in order to restore balance or maintain equilibrium? | gaseous regulation | systemic regulation | aftertouch regulation | homeostatic regulation | Homeostasis refers to the balance, or equilibrium, within the cell or a body. It is an organism’s ability to keep a constant internal environment. Keeping a stable internal environment requires constant adjustments as conditions change inside and outside the cell. The adjusting of systems within a cell is referred to a... |
What is the name of the formation that regulates sleep and arousal? | sleep-arousal formation | gelechioidea formation | epithelial formation | reticular formation | |
What do the gonadotropins regulate? | mitosis | temperature | epigenesis | gametogenesis |
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