questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
|---|---|---|
What forms when atoms share or transfer valence electrons?
Here are the choices:
A. replicas
B. fusion
C. bonds
D. levels | A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds. For a video introducti... | C: bonds. |
Which part of the axon has a higher membrane potential?
Here are the choices:
A. biofilm hillock
B. muscular hillock
C. axon hillock
D. canals hillock | C: axon hillock. | |
A diploid zygote is formed when one sperm does what?
Here are the choices:
A. fertilizes the egg
B. cracks the egg
C. repels the egg
D. incapacitates the egg | A: fertilizes the egg. | |
As ph increases what happens to a solution?
Here are the choices:
A. becomes less basic
B. depends on the solution
C. becomes more basic
D. stays the same | The deprotonated form of an acid is referred to as its conjugate base. Similarly, the protonated form of a base is referred to as its conjugate acid. | C: becomes more basic. |
What is the term for changes in speed or direction, changes that make a roller coaster ride so exciting?
Here are the choices:
A. transmission
B. oscillation
C. inclination
D. acceleration | Imagine the thrill of riding on a roller coaster like this one! The coaster slowly crawls to the top of the track and then flies down the other side. It also zooms around twists and turns at breakneck speeds. These changes in speed and direction are what make a roller coaster ride so exciting. Changes in speed or direc... | D: acceleration. |
What do aquatic mollusk species use for respiration?
Here are the choices:
A. gills
B. phototropism
C. lungs
D. pores | Which of the following statements about the anatomy of a mollusk is false? a. Mollusks have a radula for grinding food. A digestive gland is connected to the stomach. The tissue beneath the shell is called the mantle. The digestive system includes a gizzard, a stomach, a digestive gland, and the intestine. Mollusks hav... | A: gills. |
Because the solute is moving down the concentration gradient, and no input of energy is required, facilitated diffusion is considered what type of transport?
Here are the choices:
A. adaptive
B. active
C. neutral
D. passive | Facilitated diffusion is the diffusion of solutes through integral membrane transport proteins. Facilitated diffusion is a type of passive transport . Even though facilitated diffusion involves transport proteins (and is essentially a transport process), it can still be considered passive transport because the solute i... | D: passive. |
What does fiber help keep at normal levels in the body?
Here are the choices:
A. hydration
B. sugar and lipids
C. bloodpressure
D. salt and cholesterol | Fiber is a complex carbohydrate that consists mainly of cellulose and comes only from plants. High-fiber foods include whole grains and legumes such as beans. Fiber can’t be broken down by the digestive system, but it plays important roles in the body. It helps keep sugar and lipids at normal levels in the blood. It al... | B: sugar and lipids. |
What is it called when plant roots absorb liquid water and release water vapor into the atmosphere?
Here are the choices:
A. sedimentation
B. perspiration
C. transpiration
D. evaporation | Liquid water is taken up by plant roots. The plant releases water vapor into the atmosphere. This is transpiration. | C: transpiration. |
Fossil fuels and nuclear power are what type of resource?
Here are the choices:
A. recurring
B. renewable
C. reusable
D. nonrenewable | Nonrenewable resources include fossil fuels and nuclear power. | D: nonrenewable. |
The stoichiometric coefficients indicate the relative amounts of what?
Here are the choices:
A. reactants and products
B. reactions and products
C. exigencies and products
D. trajectories and products | stoichiometric coefficient : The letters a, b, c, and d where A and B are reactants, and C and D are products. The stoichiometric coefficients indicate the relative amounts of reactants and products. | A: reactants and products. |
Blood enters the heart in what valve?
Here are the choices:
A. aortic
B. mitral
C. tricuspid
D. atria | Blood flows in only one direction in the heart. Blood enters the atria, which contract and push blood into the ventricles. The atria relax and the ventricles fill with blood. Finally, the ventricles contract and push blood around the body. | D: atria. |
What works through chemical reactions that change the rock?
Here are the choices:
A. gradual weathering
B. chemical weathering
C. rock weathering
D. chemical breakdown | Chemical weathering is different than mechanical weathering. The minerals in the rock change their chemical makeup. They become a different type of mineral or even a different type of rock. Chemical weathering works through chemical reactions that change the rock. | B: chemical weathering. |
What is necessary for new alleles to be created?
Here are the choices:
A. cross-pollination
B. new rna
C. new frequencies
D. new mutations | No new mutations are occurring. Therefore, no new alleles are being created. | D: new mutations. |
What does the placenta sustain during pregnancy?
Here are the choices:
A. the mother
B. the heart
C. the fetus
D. the endocrine system | Placental mammals are therian mammals in which a placenta develops during pregnancy. The placenta sustains the fetus while it grows inside the mother’s uterus. Placental mammals give birth to relatively large and mature infants. Most mammals are placental mammals. | C: the fetus. |
Other than nitrogen, which nutrient most often limits marine production?
Here are the choices:
A. zinc
B. potassium
C. calcium
D. phosphorus | D: phosphorus. | |
What astronomical phenomenon is often comprised of remnants of the earliest material that formed in the solar system?
Here are the choices:
A. asteroids
B. particles
C. comets
D. meteorites | Many meteorites are remnants of the earliest material that formed in the solar system. | D: meteorites. |
Minerals are grouped based on what?
Here are the choices:
A. chemical composition
B. density
C. carbon composition
D. mineral composition | Minerals are divided into groups. The groups are based on their chemical composition. | A: chemical composition. |
What is the term for the average number of individuals in a population for a given area?
Here are the choices:
A. Area Density
B. population density
C. result density
D. population structure | Another sign of a species’ state of health is the density of its populations. Population density is the average number of individuals in a population for a given area. Density is a measure of how crowded or spread out the individuals in a population are on average. For example, a population of 100 deer that live in an ... | B: population density. |
What is the shape of the thyroid gland?
Here are the choices:
A. snake - shaped
B. triangle-shaped
C. butterfly-shaped
D. square-shaped | Thyroid Gland The thyroid gland is located in the neck, just below the larynx and in front of the trachea, as shown in Figure 37.16. It is a butterfly-shaped gland with two lobes that are connected by the isthmus. It has a dark red color due to its extensive vascular system. When the thyroid swells due to dysfunction, ... | C: butterfly-shaped. |
Instead of using their nose, reptiles can use what organ to smell scents?
Here are the choices:
A. eye
B. tongue
C. bladder
D. liver | Reptiles have a circulatory system with a heart that pumps blood. Reptiles also have a centralized nervous system with a brain. Their brain is relatively small, but the parts of the brain that control the senses and learning are larger than in amphibians. Reptiles have good senses of sight and smell. They use their ton... | B: tongue. |
How does the diaphragm look like when it is at rest?
Here are the choices:
A. inverted
B. dam - shaped
C. dome-shaped
D. flat | The Diaphragm The change in volume of the thoracic cavity during breathing is due to the alternate contraction and relaxation of the diaphragm (Figure 11.17). It separates the thoracic and abdominal cavities, and is dome-shaped at rest. The superior surface of the diaphragm is convex, creating the elevated floor of the... | C: dome-shaped. |
What is the smallest unit of matter that still maintains it's properties of being an element?
Here are the choices:
A. an electron
B. a cell
C. an atom
D. a proton | C: an atom. | |
Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?
Here are the choices:
A. natural change
B. natural selection
C. organic selection
D. spontaneous variation | Evolution is a change in the characteristics of living things over time. As described by Darwin, evolution occurs by a process called natural selection . In natural selection, some members of a species, being better adapted or suited to their environment, produce more offspring than others, so they pass "advantageous t... | B: natural selection. |
In flowering plants, male gametophytes are in grains of what?
Here are the choices:
A. nitrogen
B. pollen
C. viruses
D. bacteria | B: pollen. | |
How many different ways can molecules pass through a phospholipid membrane?
Here are the choices:
A. four
B. three
C. five
D. six | There are three main ways that molecules can pass through a phospholipid membrane. The first way requires no energy input by the cell and is called passive transport. The second way requires that the cell uses energy to pull in or pump out certain molecules and ions and is called active transport. The third way is thro... | B: three. |
Snow and rain are forms of what weather?
Here are the choices:
A. sediment
B. evaporation
C. precipitation
D. cold fronts | C: precipitation. | |
There is a positive correlation between the ability to conduct thermal energy and what other energy, as exemplified by metals?
Here are the choices:
A. nuclear
B. gravitational
C. electricity
D. elastic | Your feet feel cold as you walk barefoot across the living room carpet in your cold house and then step onto the kitchen tile floor. This result is intriguing, since the carpet and tile floor are both at the same temperature. The different sensation you feel is explained by the different rates of heat transfer: the hea... | C: electricity. |
Most ocean waves are caused by what?
Here are the choices:
A. wind
B. gravity
C. animals
D. radiation | A: Most ocean waves are caused by wind blowing across the water. Moving air molecules transfer some of their energy to molecules of ocean water. The energy travels across the surface of the water in waves. The stronger the winds are blowing, the larger the waves are and the more energy they have. | A: wind. |
What kind of climates are found at or near the equator?
Here are the choices:
A. tundra
B. tropical climates
C. arctic climates
D. dry grasslands | Tropical climates are found at or near the Equator. Because warm air rises at the Equator, there is a lot of rain. | B: tropical climates. |
The uranium series is a chain constituting one what, which encompass naturally occurring isotopes of the heaviest elements?
Here are the choices:
A. gland decay family
B. radioactive decay family
C. fuel decay family
D. nuclear decay family | Radioactive Decay Series The naturally occurring radioactive isotopes of the heaviest elements fall into chains of successive disintegrations, or decays, and all the species in one chain constitute a radioactive family, or radioactive decay series. Three of these series include most of the naturally radioactive element... | B: radioactive decay family. |
Producing light without a high temperature is called?
Here are the choices:
A. fluorescence
B. effervescence
C. plasma
D. luminescence | Producing light without a high temperature is called luminescence. Types of luminescence include fluorescence, electroluminescence, and bioluminescence. | D: luminescence. |
Mutualism is a symbiotic relationship that has what effect on both species involved?
Here are the choices:
A. destructive
B. harmful
C. beneficial
D. disadvantageous | Mutualism is a symbiotic relationship in which both species benefit. | C: beneficial. |
What do you call chemical reactions that take place inside living things?
Here are the choices:
A. physical reactions
B. contaminated reactions
C. autonomous reactions
D. biochemical reactions | Chemical reactions that take place inside living things are called biochemical reactions . Living things depend on biochemical reactions for more than just energy. Every function and structure of a living organism depends on thousands of biochemical reactions taking place in each cell. | D: biochemical reactions. |
What types of blood cells are required for aerobic respiration?
Here are the choices:
A. white blood cells
B. grey blood cells
C. large blood cells
D. red blood cells | D: red blood cells. | |
The phase transition of a substance changing from a liquid state to a gaseous state is an example of what?
Here are the choices:
A. spirogyra
B. catostrophy
C. trichina
D. entropoy | There are many examples in the chemical world of changes in entropy. Phase transitions are one obvious example. When a substance makes a transition from the liquid state to the gaseous state, the particles have many more possible arrangements, because they are no longer confined to a specified volume in which they are ... | D: entropoy. |
What is the fracture called when rocks on both sides move?
Here are the choices:
A. a crevice
B. a stress fracture
C. a fault
D. a shear | If the rocks on one or both sides of a fracture move, the fracture is called a fault ( Figure below ). Faults can occur alone or in clusters. A cluster of faults creates a fault zone . Earthquakes happen when rocks break and move suddenly. The energy released causes an earthquake. | C: a fault. |
In heart muscle, what released by neurons activates a signal transduction pathway?
Here are the choices:
A. dopamine
B. glutamate
C. acetylcholine
D. glucose | C: acetylcholine. | |
What do some plants produce that protects dormant seeds and aids in their dispersal?
Here are the choices:
A. leaves
B. roots
C. fruit
D. stems | C: fruit. | |
In a generator, work done to turn the coil is converted to what type of energy?
Here are the choices:
A. power
B. voltage
C. solar
D. electric | Figure 23.5 Rotation of a coil in a magnetic field produces an emf. This is the basic construction of a generator, where work done to turn the coil is converted to electric energy. Note the generator is very similar in construction to a motor. | D: electric. |
What do you call a pattern of stars in the night sky?
Here are the choices:
A. Solar Systems
B. constellation
C. planets
D. cluster | This is a constellation, a pattern of stars in the night sky. This constellation is called Orion. The features you can see best are his belt and sword. You can see Orion's belt in the sky from many locations. These stars are very bright. For many constellations, the stars are not near each other. They just happen to ap... | B: constellation. |
An antigen is a macromolecule that reacts with components of what?
Here are the choices:
A. immune system
B. circulatory system
C. digestion system
D. pulmonary system | Figure 42.10 An antigen is a macromolecule that reacts with components of the immune system. A given antigen may contain several motifs that are recognized by immune cells. Each motif is an epitope. In this figure, the entire structure is an antigen, and the orange, salmon and green components projecting from it repres... | A: immune system. |
The measure of a substances entropy at 25 degrees celsius is known as it's?
Here are the choices:
A. specific entropy
B. limited entropy
C. standard entropy
D. new entropy | As the temperature of a perfect crystal increases, its particles start to vibrate slightly around their optimal positions, thus increasing the entropy of the system. The dependence of entropy on temperature varies by substance, so the only temperature at which all crystals have the same entropy is absolute zero. The st... | C: standard entropy. |
Gastric emptying is regulated by both the stomach and what other digestive structure?
Here are the choices:
A. small intestine
B. duodenum
C. appendix
D. esophagus | greater amount of chyme at one time would overwhelm the capacity of the small intestine to handle it. The rest of the chyme is pushed back into the body of the stomach, where it continues mixing. This process is repeated when the next mixing waves force more chyme into the duodenum. Gastric emptying is regulated by bot... | B: duodenum. |
What is the type of cell division where the number of chromosomes is reduced in half?
Here are the choices:
A. mitosis
B. meiosis
C. cloning
D. interphase | The process that produces haploid gametes is meiosis. Meiosis is a type of cell division in which the number of chromosomes is reduced by half. It occurs only in certain special cells of the organisms. During meiosis, homologous chromosomes separate, and haploid cells form that have only one chromosome from each pair. ... | B: meiosis. |
What is the most common cause of lung cancer?
Here are the choices:
A. tree smoke exposure
B. tobacco smoke exposure
C. restaurant smoke exposure
D. coal smoke exposure | The new cells gradually move up through the epidermis toward the surface of the body. As they move, they produce the tough, fibrous protein called keratin. | B: tobacco smoke exposure. |
Some consumers such as the mushroom get their energy from what?
Here are the choices:
A. solar energy
B. minerals
C. dead organic matter
D. inorganic matter | Some consumers such as the mushroom in Figure above get their energy from dead organic matter. For example, they might consume dead leaves on a forest floor. | C: dead organic matter. |
What does the second number in a blood pressure reading measure?
Here are the choices:
A. optimal pressure
B. diastolic pressure
C. epithelial pressure
D. external pressure | Blood pressure is read as two numbers. The first number is the systolic pressure. The systolic pressure is the pressure on the blood vessels when the heart beats. This is the time when there is the highest pressure in the arteries. The diastolic pressure, which is the second number, is when your blood pressure is lowes... | B: diastolic pressure. |
The rock of the mantle is mostly what?
Here are the choices:
A. silicon
B. metamorphic
C. peridotite
D. crystalline | The rock of the mantle is mostly peridotite. Peridotite is formed of crystals of olivine (green) and pyroxene (black). | C: peridotite. |
Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called what?
Here are the choices:
A. trenches
B. lagoon
C. coral reefs
D. break water | In which of the following regions would you expect to find photosynthetic organisms? a. The aphotic zone, the neritic zone, the oceanic zone, and the benthic realm. The photic zone, the intertidal zone, the neritic zone, and the oceanic zone. The photic zone, the abyssal zone, the neritic zone, and the oceanic zone. Th... | C: coral reefs. |
What compound is formed when there are sparking electrical equipment?
Here are the choices:
A. carbon
B. smog
C. ozone
D. water | The sharp odor associated with sparking electrical equipment is due, in part, to ozone. | C: ozone. |
What is the number of protons in the nucleus?
Here are the choices:
A. element
B. atomic mass
C. metallic number
D. atomic number | At least by our current understanding, a given atom can be defined by its atomic number and its mass number. The atomic number is the number of protons in the nucleus. All atoms with a given atomic number are the same element, because the chemical properties of an atom are primarily determined by the number of positive... | D: atomic number. |
What organism is at the top of the energy pyramid?
Here are the choices:
A. herbivore
B. primate
C. insects
D. carnivore | Each step of the food chain in the energy pyramid is called a trophic level . Plants or other photosynthetic organisms ( autotrophs ) are found on the first trophic level, at the bottom of the pyramid. The next level will be the herbivores, and then the carnivores that eat the herbivores. The energy pyramid ( Figure be... | D: carnivore. |
What structure of the heart receives oxygen-poor blood from the body, then pumps the blood into the right ventricle?
Here are the choices:
A. right atrium
B. left ventricle
C. right ventricle
D. left atrium | One path of blood in the heart is through the right atrium and right ventricle. The right atrium receives oxygen-poor blood from the body. It pumps the blood into the right ventricle. Then the right ventricle pumps the blood out of the heart to the lungs. This path through the heart is part of the pulmonary circulation... | A: right atrium. |
Which organelle is often compared to a post office, moving proteins and lipids to where they need to go?
Here are the choices:
A. the nucleus
B. the cell wall
C. the cytoplasm
D. the golgi apparatus | The Golgi apparatus is a large organelle that sends proteins and lipids where they need to go. It’s like a post office. It receives molecules from the endoplasmic reticulum. It packages and labels the molecules. Then it sends them where they are needed. Some molecules are sent to different parts of the cell. Others are... | D: the golgi apparatus. |
What takes both the shape and the volume of their container?
Here are the choices:
A. tissues
B. fluids
C. gases
D. solids | Solids have a fixed volume and a fixed shape. Liquids have a fixed volume but take the shape of their container. Gases take both the volume and the shape of their container. | C: gases. |
What is the lowest level of organization that can perform all activities required for life?
Here are the choices:
A. tissues
B. the cell
C. organs
D. nucleii | B: the cell. | |
Where are most of the organs contained in insects?
Here are the choices:
A. the abdomen
B. thorax
C. head
D. appendages | Like other arthropods, insects have three body segments and many jointed appendages. The abdomen contains most of the internal organs. Six legs are attached to the thorax. There are several appendages on the insect’s head:. | A: the abdomen. |
The appendicular skeleton is made up of all bones of the upper and lower what?
Here are the choices:
A. organs
B. digestive tract
C. limbs
D. hemispheres | Figure 7.2 Axial and Appendicular Skeleton The axial skeleton supports the head, neck, back, and chest and thus forms the vertical axis of the body. It consists of the skull, vertebral column (including the sacrum and coccyx), and the thoracic cage, formed by the ribs and sternum. The appendicular skeleton is made up o... | C: limbs. |
What can be thought of as the capacity a device has for storing charge?
Here are the choices:
A. resonance
B. potential
C. velocity
D. capacitance | The amount of charge, , held by each plate is given by where again is the voltage difference between the plates and is the capacitance of the plate configuration. Capacitance can be thought of as the capacity a device has for storing charge . In the parallel plate case the capacitance is given by where is the area of t... | D: capacitance. |
What do electromagnetic receptors detect?
Here are the choices:
A. dangerous radiation
B. subtle radiation
C. background radiation
D. electromagnetic radiation | D: electromagnetic radiation. | |
Nutrients from food are absorbed by the blood for transport around the body as part of what system?
Here are the choices:
A. growth
B. respiratory
C. circulatory
D. digestive | In the digestive system, food is digested and its nutrients are absorbed by the blood for transport around the body. The blood is part of the cardiovascular system. | D: digestive. |
What occurs when plants release water vapor through stomata (leaf pores)?
Here are the choices:
A. transpiration
B. crystallization
C. inhalation
D. evaporation | Transpiration occurs when plants release water vapor through leaf pores called stomata (see Figure below ). The water is a product of photosynthesis. | A: transpiration. |
The stomach mucosa’s epithelial lining consists only of surface mucus cells, which secrete a protective coat of what?
Here are the choices:
A. acidic mucus
B. phosphate mucus
C. alkaline mucus
D. bile mucus | The stomach mucosa’s epithelial lining consists only of surface mucus cells, which secrete a protective coat of alkaline mucus. A vast number of gastric pits dot the surface of the epithelium, giving it the appearance of a well-used pincushion, and mark the entry to each gastric gland, which secretes a complex digestiv... | C: alkaline mucus. |
A substance too big to be pumped across the cell membrane may enter or leave the cell by what method?
Here are the choices:
A. absorption
B. vesicle transport
C. passive transpiration
D. vesicle infusion | Some substances are too big to be pumped across the cell membrane. They may enter or leave the cell by vesicle transport . This takes energy, so it's another form of active transport. You can see how vesicle transport occurs in Figure below . | B: vesicle transport. |
What is the process in which unstable nuclei become stable by emitting particles and energy and changing to different elements called?
Here are the choices:
A. radioactive decrease
B. radioactive decay
C. initial decay
D. nuclear decay | Radioactive decay is the process in which unstable nuclei become stable by emitting particles and energy and changing to different elements. There are three types of radioactive decay: alpha, beta, and gamma decay. Each differs in what is emitted, how far it can travel, and what it can penetrate. | B: radioactive decay. |
Most taste buds on the tongue are associated with nipple-shaped projections called what?
Here are the choices:
A. cilia
B. antennae
C. mucosa
D. papillae | D: papillae. | |
What is the lowest energy state of the atom called?
Here are the choices:
A. base state
B. ground state
C. active state
D. work state | The electrons in an atom tend to be arranged in such a way that the energy of the atom is as low as possible. The ground state of an atom is the lowest energy state of the atom. When those atoms are given energy, the electrons absorb the energy and move to a higher energy level. These energy levels of the electrons in ... | B: ground state. |
What kind of diseases involve the immune system accidentally attacking healthy body cells?
Here are the choices:
A. autoimmune
B. metabolic
C. inflammation
D. contagious diseases | Autoimmune diseases occur when the immune system fails to recognize the body’s own molecules as “self,” or belonging to the person. Instead, it attacks body cells as though they were dangerous pathogens. Some relatively common autoimmune diseases are listed in Table below . These diseases cannot be cured, although they... | A: autoimmune. |
Bacteria may divide several what an hour?
Here are the choices:
A. days
B. hosts
C. cells
D. times | Asexual reproduction can be very rapid. This is an advantage for many organisms. It allows these organisms to crowd out other organisms that reproduce more slowly. Bacteria, for example, may divide several times per hour. Under ideal conditions, 100 bacteria can divide to produce millions of bacterial cells in just a f... | D: times. |
The partial pressure of each gas in a mixture is proportional to its what?
Here are the choices:
A. chemical fraction
B. lactic fraction
C. mesh fraction
D. mole fraction | The partial pressure of each gas in a mixture is proportional to its mole fraction. KEY EQUATIONS Mole fraction. | D: mole fraction. |
The combination decomposition or rearrangement of elements and compounds to form new substances is known as?
Here are the choices:
A. ionic changes
B. mineral changes
C. carbon changes
D. chemical changes | As the rust forms on the surface of the iron, it flakes off to expose more iron, which will continue to rust. Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change. Some chemical changes are not as obvious but are still hugely important. For example, photosynthesis and cell... | D: chemical changes. |
When is melatonin secreted?
Here are the choices:
A. in the afternoon
B. at night
C. all day
D. in the morning | B: at night. | |
In which phase do the chromosomes duplicate?
Here are the choices:
A. metaphase
B. interphase
C. mitosis
D. prophase | B: interphase. | |
Which muscle is a band-like muscle that extends from the anterior superior iliac spine to the medial side?
Here are the choices:
A. sartorius
B. soleus
C. tibialis anterior
D. vastus medialis | The muscles of the anterior compartment of the thigh flex the thigh and extend the leg. This compartment contains the quadriceps femoris group, which actually comprises four muscles that extend and stabilize the knee. The rectus femoris is on the anterior aspect of the thigh, the vastus lateralis is on the lateral aspe... | A: sartorius. |
Filter feeders, such as sponges, pump water into their body through what structures?
Here are the choices:
A. valves
B. fibers
C. pores
D. lungs | Sponges are filter feeders. They pump water into their body through their pores. The water flows through a large central cavity called the spongocoel (see Figure above ). As the water flows by, specialized collar cells filter out food particles such as bacteria. Collar cells have tiny hairs that trap the particles. The... | C: pores. |
What are ionic solutes?
Here are the choices:
A. solvent
B. salts
C. carbohydrates
D. electrolytes | Each substance can be classified as an ionic solute or a nonionic solute. Ionic solutes are electrolytes, and nonionic solutes are nonelectrolytes. Potassium chloride is an ionic compound; therefore, when it dissolves, its ions separate, making it an electrolyte. Fructose is a sugar similar to glucose. (In fact, it has... | D: electrolytes. |
As with other organic compounds that form hydrogen bonds, water solubility of amines is reflected in the length of what?
Here are the choices:
A. nuclei chains
B. complex carbohydrates
C. hydrocarbon bonds
D. carbon chains | Amines are capable of hydrogen bonding though their boiling points are generally a bit lower than the corresponding alcohol. Methylamine and ethylamine are gases at room temperature, while larger amines are liquids. As with other organic compounds that form hydrogen bonds, water solubility is reflected in the length of... | D: carbon chains. |
What is the tubular passageway through which the embryo or fetus leaves the mother’s body during birth?
Here are the choices:
A. uterus
B. penis
C. vagina
D. cervix | The vagina is a tubular passageway through which the embryo or fetus leaves the mother’s body during birth. The vagina is also where the male deposits sperm during mating. | C: vagina. |
What has the average global temperature done since the 1900s?
Here are the choices:
A. stayed constant
B. risen
C. changed randomly
D. decreased | Average global temperature has risen since 1900. | B: risen. |
An solid object with an irregular shape can be measured via what method?
Here are the choices:
A. vibration
B. displacement
C. variation
D. radiation | The volume of an irregularly shaped solid can be measured by the displacement method. You can read below how this method works. For a video on the displacement method, go to this URL: http://www. youtube. com/watch?v=e0geXKxeTn4 . | B: displacement. |
Deterioration of limestone occurs more rapidly as the concentration of what increases?
Here are the choices:
A. water pollutants
B. ground pollutants
C. ocean pollutants
D. air pollutants | Figure 12.7 Statues made from carbonate compounds such as limestone and marble typically weather slowly over time due to the actions of water, and thermal expansion and contraction. However, pollutants like sulfur dioxide can accelerate weathering. As the concentration of air pollutants increases, deterioration of lime... | D: air pollutants. |
In which order does the reactivity of halogen group decline?
Here are the choices:
A. left to right
B. bottom to top
C. right to left
D. top to bottom | The halogens are among the most reactive of all elements, although reactivity declines from the top to the bottom of the halogen group. Because all halogens have seven valence electrons, they are “eager” to gain one more electron. Doing so gives them a full outer energy level, which is the most stable arrangement of el... | D: top to bottom. |
Photosynthesis converts carbon dioxide and water into what?
Here are the choices:
A. insulin
B. glutamate
C. carbon
D. glucose | In food chemistry, the substances known as antioxidants are reducing agents. Ascorbic acid (vitamin C; C6H8O6) is thought to retard potentially damaging oxidation of living cells. In the process, it is oxidized to dehydroascorbic acid (C6H6O6). In the stomach, ascorbic acid reduces the nitrite ion (NO2−) to nitric oxid... | D: glucose. |
Which genetic disorder results in the inability of melanocytes to produce melanin?
Here are the choices:
A. hyperthyroidism
B. anemia
C. albinism
D. cancers | Integumentary System The first thing a clinician sees is the skin, and so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitilig... | C: albinism. |
Most diseases caused by bacteria can be cured by which medicines?
Here are the choices:
A. hydroxides
B. inhibitors
C. antibiotics
D. antioxidants | Living things that cause human diseases include bacteria, fungi, and protozoa. Most infectious diseases caused by these organisms can be cured with medicines. For example, medicines called antibiotics can cure most diseases caused by bacteria. Bacteria are one-celled organisms without a nucleus. Although most bacteria ... | C: antibiotics. |
What season do the largest waves for surfers typically come?
Here are the choices:
A. summer
B. winter
C. autumn
D. spring | Jaws Beach in Maui, Hawaii has legendary waves. The largest waves come when winds are very strong, usually in the winter. The rocks and reef offshore magnify the size of the incoming wave energy. Cowabunga!. | B: winter. |
The peripheral nervous system has major nerves that travel through every part of the body except which two places?
Here are the choices:
A. brain and spinal cord
B. lungs and spinal cord
C. muscles and brain
D. brain and heart | All the other nervous tissues in the body are part of the peripheral nervous system. If you look again at Figure above , you can see the major nerves of the peripheral nervous system. They include nerves that run through virtually every part of the body, both inside and out, except for the brain and spinal cord. | A: brain and spinal cord. |
Each nitrogenous base has one or two rings that include which atoms?
Here are the choices:
A. nitrogen
B. hydrogen
C. carbon
D. oxygen | A: nitrogen. | |
Pluto's orbit is so elliptical that sometimes it is inside the orbit of which planet?
Here are the choices:
A. Earth
B. neptune
C. titan
D. Mars | For decades Pluto was a planet. But even then, scientists knew it was an unusual planet. The other outer planets are all gas giants. Pluto is small, icy and rocky. With a diameter of about 2400 kilometers, it has only about 1/5 the mass of Earth’s Moon. The other planets orbit in a plane. Pluto's orbit is tilted. The s... | B: neptune. |
More than half the compounds produced by the chemical industry are what?
Here are the choices:
A. artificial polymers
B. replacement polymers
C. gas polymers
D. synthetic polymers | fibers, films, plastics, semisolid resins, and rubbers are also polymers. More than half the compounds produced by the chemical industry are synthetic polymers. Some common addition polymers are listed in http://catalog. flatworldknowledge. com/bookhub/reader/2547 - gob-ch13_s05_t01. Note that all the monomers have car... | D: synthetic polymers. |
What is it called when electrons are shared equally?
Here are the choices:
A. polar bonds
B. nonpolar bonds
C. helices bonds
D. metabolized bonds | In other covalent bonds, electrons are shared equally. These bonds are called nonpolar bonds. Neither atom attracts the shared electrons more strongly. As a result, the atoms remain neutral. Figure below shows an example of nonpolar bonds. | B: nonpolar bonds. |
Ribosomes are cellular substructures where what are synthesized?
Here are the choices:
A. acids
B. proteins
C. cells
D. Molecule | Ribosomes are cellular substructures where proteins are synthesized. They contain about 65% rRNA and 35% protein, held together by numerous noncovalent interactions, such as hydrogen bonding, in an overall structure consisting of two globular particles of unequal size. Molecules of tRNA, which bring amino acids (one at... | B: proteins. |
How long can carbon be stored in sedimentary rock?
Here are the choices:
A. less than 1000 years
B. millions of years
C. 22 weeks
D. around 10,000 years | Carbon cycles quickly between organisms and the atmosphere. Cellular respiration releases carbon into the atmosphere as carbon dioxide. Carbon is also released when organisms decompose. Human actions, such as the burning of fossil fuels, also release carbon into the atmosphere. Natural processes, such as volcanic erupt... | B: millions of years. |
What do you call an animal in which the embryo, often termed a joey, is born immature and must complete its development outside the mother's body?
Here are the choices:
A. placental mammal
B. marsupial
C. eukaryotic
D. monotreme | All other mammals give birth to live young and belong to one of two different categories, the marsupials and the placental mammals. A marsupial is an animal in which the embryo, which is often called a joey, is born at an immature stage. Development must be completed outside the mother's body. Most female marsupials ha... | B: marsupial. |
What is the most important element to life?
Here are the choices:
A. carbon
B. oxygen
C. nitrogen
D. hydrogen | Carbon is the most important element to life. Without this element, life as we know it would not exist. As you will see, carbon is the central element in compounds necessary for life-organic compounds. These compounds include carbohydrates, lipids, proteins and nucleic acids. | A: carbon. |
The idea of evolution has been around for centuries. in fact, it goes all the way back to the ancient greek philosopher named?
Here are the choices:
A. Galileo
B. Pluto
C. Xerxes
D. aristotle | The idea of evolution has been around for centuries. In fact, it goes all the way back to the ancient Greek philosopher Aristotle. However, evolution is most often associated with Charles Darwin. Darwin published a book on evolution in 1859 titled On the Origin of Species . In the book, Darwin stated the theory of evol... | D: aristotle. |
When a balloon is rubbed against hair, why do they attract each other?
Here are the choices:
A. constantly electron charge
B. lean electron charge
C. opposite electron charge
D. same electron charge | Electrons are transferred from hair to a balloon rubbed against the hair. Then the oppositely charged hair and balloon attract each other. | C: opposite electron charge. |
Living things get energy from food in a process called respiration, which releases what gas back into the atmosphere?
Here are the choices:
A. hydrogen
B. oxygen
C. nitrogen
D. carbon dioxide | Carbon doesn’t stop there. Living things get energy from food in a process called respiration. This releases carbon dioxide back into the atmosphere. The cycle then repeats. | D: carbon dioxide. |
What is the name of the scientific field that deals with the general study of the solid earth?
Here are the choices:
A. chemistry
B. physics
C. geology
D. astronomy | Geology is the study of the solid Earth. Geologists study how rocks and minerals form. The way mountains rise up is part of geology. The way mountains erode away is another part. Geologists also study fossils and Earth’s history. There are many other branches of geology. There is so much to know about our home planet t... | C: geology. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.