questions stringlengths 37 1.22k | reasoning stringlengths 0 3.56k ⌀ | answers stringlengths 4 138 |
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What is the greatest contribution of arthropods to human food supply?
Here are the choices:
A. vegetation
B. reproduction
C. hibernation
D. pollination | The intentional cultivation of arthropods and other small animals for human food, referred to as minilivestock, is now emerging in animal husbandry as an ecologically sound concept. However, the greatest contribution of arthropods to human food supply is by pollination. Three-fourths of the world’s flowering plants and... | D: pollination. |
What kind of weather change do la nina years usually bring?
Here are the choices:
A. Mass amounts of snow
B. moisture
C. drought
D. heat | El Niño and La Niña bring about dramatic changes in climate for a year or two. In some locations, one brings rain and the other brings drought. In California, for example, El Niño years are full of snow and rain. La Niña years tend toward drought. These variations can bring tremendous changes to living creatures. Human... | C: drought. |
In physics, _______ is defined as the average kinetic energy of the particles in an object?
Here are the choices:
A. heat
B. temperature
C. climate
D. potential energy | No doubt you already have a good idea of what temperature is. You might define it as how hot or cold something feels. In physics, temperature is defined as the average kinetic energy of the particles in an object. When particles move more quickly, temperature is higher and an object feels warmer. When particles move mo... | B: temperature. |
What are proteins encoded by?
Here are the choices:
A. codons
B. DNA
C. RNA
D. genes | D: genes. | |
In alcoholic fermentation , which acid changes to alcohol and carbon dioxide?
Here are the choices:
A. lipoic
B. chloride
C. pyruvic
D. rain | In alcoholic fermentation , pyruvic acid changes to alcohol and carbon dioxide. This is shown in Figure below . NAD + also forms from NADH, allowing glycolysis to continue making ATP. This type of fermentation is carried out by yeasts and some bacteria. It is used to make bread, wine, and biofuels. | C: pyruvic. |
What is another term for scale worms?
Here are the choices:
A. halkieria
B. wormidanopis
C. spirogyra
D. trichina | Halkieria, or scale worms, are an example of a fossil life from the Cambrian. | A: halkieria. |
What type of device do scientist use to determine wind speed?
Here are the choices:
A. photometer
B. dynamometer
C. barometer
D. anemometer | D: anemometer. | |
Which constellation looks like a rectangle high in winter's south-southeastern sky?
Here are the choices:
A. Apus
B. orion
C. Caelum
D. Andromeda | The star constellation “Orion, The Hunter”. Orion is one of the most beautiful of all constellations, and one of the easiest to find. It looks like a large (slightly twisted) rectangle high in winter's south-southeastern sky. Two of the brightest stars in the evening sky lie at opposite corners of the rectangle: bright... | B: orion. |
What mammal is often a pollinator of nocturnal flowers?
Here are the choices:
A. rabbits
B. bat
C. sunbirds
D. hummingbirds | Pollination by Bats In the tropics and deserts, bats are often the pollinators of nocturnal flowers such as agave, guava, and morning glory. The flowers are usually large and white or pale-colored; thus, they can be distinguished from the dark surroundings at night. The flowers have a strong, fruity, or musky fragrance... | B: bat. |
What can reproduce by infecting the cell of a living host?
Here are the choices:
A. bacteria
B. mucus
C. carcinogens
D. virus | A virus cannot reproduce on its own. However, a virus can reproduce by infecting the cell of a living host. Inside the host cell, the virus uses the cell’s structures, materials, and energy to make copies of itself. | D: virus. |
The theory that establishes the concepts of atoms and how they compose matter is called what?
Here are the choices:
A. contemporary atomic theory
B. modern atomic theory
C. modern particle theory
D. unified matter theory | The modern atomic theory establishes the concepts of atoms and how they compose matter. | B: modern atomic theory. |
How does the heart transport blood?
Here are the choices:
A. nerves
B. muscles
C. blood pellets
D. blood vessels | A screw is an inclined plane wrapped around a cylinder. When on a screw, inclined planes are called threads, which can be seen in the image above. The mechanical advantage of a screw increases with the density of the threads. The calculations to determine the IMA for a screw involve the circumference of the head of the... | D: blood vessels. |
The gender of a baby is determined by what special pair of chromosomes?
Here are the choices:
A. sister chromatids
B. sex chromosomes
C. diploid chromosomes
D. reflection chromosomes | One of the exciting things about expecting a child is wondering if the baby will be a boy or a girl. There are many superstitions about how one might influence or predict the outcome. But what really determines if a baby is male or female? We now know that the gender of a baby is determined by a special pair of chromos... | B: sex chromosomes. |
What does the activity of an organism depend on the totality of?
Here are the choices:
A. interdependence
B. independent cells
C. adaptations
D. chemical attraction | the activity of an organism depends on the total activity of independent cells,. | B: independent cells. |
What is solid water that forms when water vapor undergoes deposition?
Here are the choices:
A. frost
B. distillate
C. dew
D. glacier | Frost is solid water that forms when water vapor undergoes deposition. | A: frost. |
What gets released into the atmosphere when fossil fuels are burned?
Here are the choices:
A. hydrogen
B. chemical dioxide
C. oxygen
D. carbon dioxide | Using fossil fuels and nuclear energy creates other problems as well. The burning of fossil fuels releases carbon dioxide into the atmosphere. This is one of the major greenhouse gases causing global climate change. Nuclear power creates another set of problems, including the disposal of radioactive waste. | D: carbon dioxide. |
What is the term for the measure of a fluid's thickness?
Here are the choices:
A. friction
B. salinity
C. elasticity
D. viscosity | Characteristics of Blood When you think about blood, the first characteristic that probably comes to mind is its color. Blood that has just taken up oxygen in the lungs is bright red, and blood that has released oxygen in the tissues is a more dusky red. This is because hemoglobin is a pigment that changes color, depen... | D: viscosity. |
Plant cells have structures that animal cells?
Here are the choices:
A. drink
B. lack
C. have
D. eat | Plant cells have structures that animal cells lack. What important process takes place in plant cells but not in animal cells that might explain their differences?. | B: lack. |
What reduces the need for pesticides and other toxic chemicals?
Here are the choices:
A. pollen
B. helium
C. yeast
D. fungi | Harmless fungi can be used to control pathogenic bacteria and insect pasts on crops. Fungi compete with bacteria for nutrients and space, and they parasitize insects that eat plants. Fungi reduce the need for pesticides and other toxic chemicals. | D: fungi. |
Matter can be described with what two encompassing types of properties?
Here are the choices:
A. color and distance
B. physical and chemical
C. thermal and magnetic
D. velocity and energy | Matter can be described with both physical properties and chemical properties. | B: physical and chemical. |
When the number of active receptors falls below that threshold, what happens to the cellular response?
Here are the choices:
A. it stabilizes
B. it responds
C. it increases
D. it ceases | D: it ceases. | |
Types of neurons include sensory neurons, motor neurons, and?
Here are the choices:
A. histones
B. anions
C. interneurons
D. synapses | Types of neurons include sensory neurons, motor neurons, and interneurons. | C: interneurons. |
Active and passive forms of what enable the body to resist damage from pathogens?
Here are the choices:
A. immunity
B. autonomy
C. potential
D. stem cells | Active versus Passive Immunity Immunity to pathogens, and the ability to control pathogen growth so that damage to the tissues of the body is limited, can be acquired by (1) the active development of an immune response in the infected individual or (2) the passive transfer of immune components from an immune individual... | A: immunity. |
What is the energy of motion called?
Here are the choices:
A. mixed energy
B. kinetic energy
C. potential energy
D. binary energy | B: kinetic energy. | |
What is the term for an infection caused by a fungal parasite?
Here are the choices:
A. mitosis
B. mycosis
C. acrobasis
D. mydriasis | B: mycosis. | |
What do you call the ability to sense sound energy and perceive sound?
Here are the choices:
A. sensory deprivation
B. hearing
C. tuning
D. echolocation | Hearing is the ability to sense sound energy and perceive sound. The ear is the organ that senses sound and allows us to hear. Damage to structures of the ear may cause hearing loss. Total hearing loss is called deafness. | B: hearing. |
Some plants can detect increased levels of what when reflected from leaves of encroaching neighbors?
Here are the choices:
A. light
B. water
C. oxygen
D. air | A: light. | |
What are the high points of a transverse wave called?
Here are the choices:
A. peaks
B. troughs
C. ridges
D. crests | A transverse wave can be characterized by the high and low points reached by particles of the medium as the wave passes through. This is illustrated in Figure below . The high points are called crests, and the low points are called troughs. | D: crests. |
What is the transfer of heat by a current?
Here are the choices:
A. convection
B. radiation
C. diffusion
D. combustion | Convection is the transfer of heat by a current. Convection happens in a liquid or a gas. Air near the ground is warmed by heat radiating from Earth's surface. The warm air is less dense, so it rises. As it rises, it cools. The cool air is dense, so it sinks to the surface. This creates a convection current, like the o... | A: convection. |
When acellular slime molds swarm, they fuse together to form a single cell with many what?
Here are the choices:
A. nuclei
B. cytoplasm
C. digestive tracts
D. lungs | When acellular slime molds swarm, they fuse together to form a single cell with many nuclei. | A: nuclei. |
Potential energy is not only associated with the location of matter, but also with the structure of matter. even a spring on the ground has potential energy if it is what?
Here are the choices:
A. watched
B. coupled
C. ignored
D. compressed | Potential energy is not only associated with the location of matter, but also with the structure of matter. Even a spring on the ground has potential energy if it is compressed; so does a rubber band that is pulled taut. On a molecular level, the bonds that hold the atoms of molecules together exist in a particular str... | D: compressed. |
What is the name of film that polyester fibers form?
Here are the choices:
A. Softness
B. fabric
C. mylar
D. layers | Polyester molecules make excellent fibers and are used in many fabrics. A knitted polyester tube, which is biologically inert, can be used in surgery to repair or replace diseased sections of blood vessels. PET is used to make bottles for soda pop and other beverages. It is also formed into films called Mylar. When mag... | C: mylar. |
Where do germline mutations occur in?
Here are the choices:
A. in aggregations
B. in spores
C. In blood cells
D. in gametes | Germline mutations occur in gametes. Somatic mutations occur in other body cells. Chromosomal alterations are mutations that change chromosome structure. Point mutations change a single nucleotide. Frameshift mutations are additions or deletions of nucleotides that cause a shift in the reading frame. | D: in gametes. |
What a mixture of nitric acid and hydrochloric acid?
Here are the choices:
A. acidus regia
B. crystal regia
C. aqua regia
D. sulfate regia | Aqua regia, a mixture of nitric acid and hydrochloric acid, is one of the few materials that will dissolve gold. This material, translated to "royal water" in English, was named so because it could dissolve the royal metal gold. First noted in the fourteenth century, aqua regia could be used to help ascertain whether a... | C: aqua regia. |
Most members of what kingdom of spore-making organisms grow on the forest floor, where the dark and damp environment is rich?
Here are the choices:
A. bacteria
B. fungi
C. algae
D. moss | Habitats Although fungi are primarily associated with humid and cool environments that provide a supply of organic matter, they colonize a surprising diversity of habitats, from seawater to human skin and mucous membranes. Chytrids are found primarily in aquatic environments. Other fungi, such as Coccidioides immitis, ... | B: fungi. |
What results when the water vapor from a hot shower contacts the cooler surface of a mirror?
Here are the choices:
A. cleaner mirror
B. foggy mirror
C. mirror brightens
D. the mirror breaks | If you take a hot shower in a closed bathroom, the mirror is likely to "fog" up. The "fog" consists of tiny droplets of water that form on the cool surface of the mirror. Why does this happen? Some of the hot water from the shower evaporates, so the air in the bathroom contains a lot of water vapor. When the water vapo... | B: foggy mirror. |
What type of vascular plants produce seeds in cones?
Here are the choices:
A. gymnosperms
B. lipids
C. angiosperms
D. Proteins | Gymnosperms are vascular plants that produce seeds in cones . Examples include conifers such as pine and spruce trees. The gymnosperm life cycle has a dominant sporophyte generation. Both gametophytes and the next generation’s new sporophytes develop on the sporophyte parent plant. Figure below is a diagram of a gymnos... | A: gymnosperms. |
In fruit flies, all homeotic genes are found on one what?
Here are the choices:
A. chromosome
B. genome
C. site
D. enzymes | A: chromosome. | |
Certain medications can suppress the immune system. this is an intended effect of drugs given to people with what?
Here are the choices:
A. transplanted organs
B. benign tumors
C. infections
D. genetic disorders | Certain medications can suppress the immune system. This is an intended effect of drugs given to people with transplanted organs. In many cases, however, it is an unwanted side effect of drugs used to treat other diseases. | A: transplanted organs. |
The geometry of the bf 3 molecule is called what?
Here are the choices:
A. distorted planar
B. fractal planar
C. spherical planar
D. trigonal planar | The geometry of the BF 3 molecule is called trigonal planar . The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120°, and all four atoms lie in the same plane. | D: trigonal planar. |
In multicellular organisms, mutations can be subdivided into germline mutations and?
Here are the choices:
A. elective mutations
B. resultant mutations
C. somatic mutations
D. comparative mutations | Once again, a mutation is the change in the DNA or RNA sequence. In multicellular organisms, mutations can be subdivided into germline mutations and somatic mutations. Germline mutations occur in the DNA of sex cells, or gametes, and are therefore potentially very serious. These mutations can be passed to the next gene... | C: somatic mutations. |
What is the name for a biologist who studies fungi?
Here are the choices:
A. egyptologists
B. mycologists
C. oncologists
D. musicologists | Mycologist Mycologists are biologists who study fungi. Mycology is a branch of microbiology, and many mycologists start their careers with a degree in microbiology. To become a mycologist, a bachelor's degree in a biological science (preferably majoring in microbiology) and a master's degree in mycology are minimally n... | B: mycologists. |
How many different kinds of ions are produced when sodium chloride dissociates ?
Here are the choices:
A. three
B. one
C. five
D. two | The sodium chloride dissociates into two ions, while the glucose does not dissociate. Therefore, equal concentrations of each solution will result in twice as many dissolved particles in the case of the sodium chloride. The vapor pressure of the sodium chloride solution will be lowered twice the amount as the glucose s... | D: two. |
What mineral is made of one silicon atom and two oxygen atoms?
Here are the choices:
A. glass
B. cobalt
C. quartz
D. pumice | 5. Quartz is made of one silicon atom and two oxygen atoms. If you find a mineral and find that it is made of one silicon atom and one oxygen atom is it quartz?. | C: quartz. |
How many cycles do cells have?
Here are the choices:
A. seven
B. six
C. two
D. four | This diagram represents the cell cycle in eukaryotes. The cell cycle depicts the life of an eukaryotic cell. The cell cycle has four phases: the first growth or gap (G 1 ) phase, the synthesis (S) phase, the second growth or gap (G 2 ) phase and the mitotic (M) phase. The M phase includes mitosis and cytokinesis. The c... | D: four. |
Gas particles can move randomly in what directions?
Here are the choices:
A. all directions
B. some directions
C. few directions
D. one direction | Christopher Auyeung. Gas particles move randomly in all directions . CC BY-NC 3.0. | A: all directions. |
The total number of protons and neutorns in an atom is called what?
Here are the choices:
A. formation number
B. atom number
C. volume number
D. mass number | The mass number is defined as the total number of protons and neutrons in an atom. | D: mass number. |
All matter is composed of tiny indivisible particles called atoms. all atoms of an element are identical in mass and this?
Here are the choices:
A. acid properties
B. electrical properties
C. liquid properties
D. chemical properties | All matter is composed of tiny indivisible particles called atoms. All atoms of an element are identical in mass and chemical properties, whereas atoms of different elements differ in mass and fundamental chemical properties. A chemical compound is a substance that always contains the same atoms in the same ratio. In c... | D: chemical properties. |
Where do lightnings build up?
Here are the choices:
A. troposphere
B. clouds
C. air
D. stratosphere | Lightning is the discharge of static electricity that has built up on clouds. Every year, the earth experiences an average of 25 million lightning strikes. Lightning bolts travel at speeds up to 60,000 miles per second, and can reach temperatures of 50,000°F, which is five times the temperature of the surface of the su... | B: clouds. |
What do we call zeros that appear after nonzero digits?
Here are the choices:
A. significant digits
B. left-end zeros
C. placeholders
D. right-end zeros | 4. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that lacks a decimal point are not significant. A. 140 has two significant figures. | D: right-end zeros. |
What term is used to describe a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms?
Here are the choices:
A. sigma bond
B. lattice bond
C. beta bond
D. rna bond | It is necessary to distinguish between the two types of covalent bonds in a C 2 H 4 molecule. A sigma bond (σ bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms. A pi bond (π bond) is a bond formed by the overlap of ... | A: sigma bond. |
According to count rumford, which two are equivalent ways of transferring energy?
Here are the choices:
A. time and space
B. osmosis and heredity
C. addition and multiplication
D. heat and work | In the 1780s, an American scientist named Benjamin Thompson, also known as Count Rumford, was hired by the Elector of Bavaria to supervise the manufacture of cannons. During the manufacturing process, teams of horses harnessed to a large-toothed wheel supplied the power needed to drill a hole several inches in diameter... | D: heat and work. |
What type of radio waves exist in the 540 to 1600 khz frequency range?
Here are the choices:
A. microwaves
B. fm radio waves
C. sound waves
D. am radio waves | AM radio waves are used to carry commercial radio signals in the frequency range from 540 to 1600 kHz. The abbreviation AM stands for amplitude modulation, which is the method for placing information on these waves. (See Figure 24.12. ) A carrier wave having the basic frequency of the radio station, say 1530 kHz, is va... | D: am radio waves. |
What type of cells make up about one quarter of all white blood cells?
Here are the choices:
A. Fat
B. erythrocytes
C. lymphocytes
D. tumors | Lymphocytes ( Figure below ), a type of white blood cell, are the key cells of an immune response. There are trillions of lymphocytes in the human body. They make up about one quarter of all white blood cells. Usually, fewer than half of the body’s lymphocytes are in the blood. The rest are in the lymph, lymph nodes, a... | C: lymphocytes. |
The mass of the objects and the distance between them affect the strength of what universal force?
Here are the choices:
A. gravity
B. weight
C. motion
D. states of matter | All objects in the universe have a gravitational attraction to each other ( Figure below ). The strength of the force of gravity depends on two things. They are the mass of the objects and the distance between them. The greater the objects’ mass, the greater the force of attraction. As the distance between the objects ... | A: gravity. |
Without the dominant disturbance, the fire-adapted species are usually outcompeted and biodiversity is what?
Here are the choices:
A. immaterial
B. increased
C. unaffected
D. reduced | D: reduced. | |
Constantly going through some form of growth and repair is a characteristic of all what?
Here are the choices:
A. bacteria
B. mass
C. living things
D. viruses | C: living things. | |
Positive charges move in the direction of the electric field and the same direction as what current?
Here are the choices:
A. alternating current
B. direct current
C. conventional current
D. relativity current | Figure 20.4 Current I is the rate at which charge moves through an area A , such as the cross-section of a wire. Conventional current is defined to move in the direction of the electric field. (a) Positive charges move in the direction of the electric field and the same direction as conventional current. (b) Negative c... | C: conventional current. |
Redox reactions, like other chemical reactions, begin with a product and end with what?
Here are the choices:
A. reactant
B. decomposition
C. stimulant
D. plasma | Learn to balanced simple redox reactions by inspection. Learn to balance complex redox reactions by the half reaction method. Use the solvent, or parts of it, as a reactant or a product in balancing a redox reaction. Balancing simple redox reactions can be a straightforward matter of going back and forth between produc... | A: reactant. |
How does alcohol expand over a wide range of temperatures?
Here are the choices:
A. erratically
B. uniformly
C. variably
D. exponentially | The red liquid in this thermometer is alcohol. Alcohol expands uniformly over a wide range of temperatures. This makes it ideal for use in thermometers. | B: uniformly. |
How many years ago may the earliest fungi have evolved?
Here are the choices:
A. .350 million
B. 600 million
C. 500 million
D. .250 million | The earliest fungi may have evolved about 600 million years ago. | B: 600 million. |
What are the bones in partly movable joints held in place by?
Here are the choices:
A. collagen
B. socket
C. tendons
D. cartilage | Partly movable joints allow only very limited movement. Bones at these joints are held in place by cartilage. The ribs and sternum are connected by partly movable joints. | D: cartilage. |
Sepals, petals, stamens, and carpels are what kind of organs?
Here are the choices:
A. marine
B. floral
C. animal
D. reproductive | B: floral. | |
How do most growing plant cells expand?
Here are the choices:
A. through photosynthesis
B. through cell respiration
C. through water uptake
D. through germination | C: through water uptake. | |
What is the common term for the chemical formula h 2 0?
Here are the choices:
A. hydrogen
B. water
C. oxygen
D. air | Water is an amazing molecule. It has a very simple chemical formula, H 2 O. It is made of just two hydrogen atoms bonded to one oxygen atom. Water is remarkable in terms of all the things it can do. Lots of things dissolve easily in water. Some types of rock can even completely dissolve in water! Other minerals change ... | B: water. |
What kind of reaction is needed to prepare amides?
Here are the choices:
A. carboxylic acid reaction
B. amino acid reaction
C. lipophilic acid reaction
D. oxidize acid reaction | Amides are prepared by the reaction of a carboxylic acid with ammonia or an amine. | A: carboxylic acid reaction. |
What is the process by which the egg is fertilized by the pollen of the same flower?
Here are the choices:
A. self pollination
B. self formation
C. self condensation
D. self realization | In self-pollination , the egg is fertilized by the pollen of the same flower. | A: self pollination. |
In moss, what becomes elongated to elevate the capsule to enhance spore dispersal?
Here are the choices:
A. seta
B. porta
C. sera
D. risa | A: seta. | |
What is the base unit that frequency is typically measured in?
Here are the choices:
A. hertz
B. watt
C. degrees
D. volume | The frequency , , is the number of cycles an object goes through in 1 second. Frequency is measured in Hertz (Hz). 1 Hz = 1 cycle per sec. | A: hertz. |
Controlling muscles and maintaining balance are just two of the roles of what system?
Here are the choices:
A. digestive system
B. electrical system
C. nervous system
D. bacterial system | Controlling muscles and maintaining balance are just two of the roles of the nervous system. The nervous system also lets you:. | C: nervous system. |
Displacement divided by time is equal to the average what?
Here are the choices:
A. speed
B. velocity
C. force
D. acceleration | Average velocity is displacement divided by time. | B: velocity. |
The complete hydrolysis of starch yields what?
Here are the choices:
A. insulin
B. glucose
C. glutamate
D. sucrose | Both amylopectin and glycogen contain branch points that are linked through α-1,6linkages. These branch points occur more often in glycogen. Dextrins are glucose polysaccharides of intermediate size. The shine and stiffness imparted to clothing by starch are due to the presence of dextrins formed when clothing is irone... | B: glucose. |
What term describes an imbalance of attractive forces between liquid molecules at the surface of a liquid?
Here are the choices:
A. molecular tension
B. currents tension
C. surface tension
D. obsolute tension | Surface tension is an imbalance of attractive forces between liquid molecules at the surface of a liquid. | C: surface tension. |
In mammals, four specialized types of what serve to cut, tear, and grind food?
Here are the choices:
A. plates
B. teeth
C. scales
D. spines | Mammalian teeth are also important for digestion. The four types of teeth are specialized for different feeding functions, as shown in Figure below . Together, the four types of teeth can cut, tear, and grind food. This makes food easier and quicker to digest. | B: teeth. |
Atherosclerosis and coronary heart disease are examples of what type of body system disease?
Here are the choices:
A. cardiovascular system
B. excretory system
C. digestive system
D. connective system | Diseases of the cardiovascular system are common and may be life threatening. Examples include atherosclerosis and coronary heart disease. A healthy lifestyle can reduce the risk of such diseases developing. This includes avoiding smoking, getting regular physical activity, and maintaining a healthy percent of body fat... | A: cardiovascular system. |
When cats mark their territory by rubbing their face against an object, they deposit chemicals released by what structures?
Here are the choices:
A. scent glands
B. whiskers
C. taste buds
D. pituitary glands | Some animals deposit chemicals to mark the boundary of their territory. This is why dogs urinate on fire hydrants and other objects. Cats may also mark their territory by depositing chemicals. They have scent glands in their face. They deposit chemicals by rubbing their face against objects. | A: scent glands. |
Like other bryophytes, moss plants spend most of their life cycle as?
Here are the choices:
A. copepods
B. bacteriophages
C. spores
D. gametophytes | Like other bryophytes, moss plants spend most of their life cycle as gametophytes. Find the sporophyte in the diagram. Do you see how it is growing on the gametophyte plant?. | D: gametophytes. |
What is a benefit of low sulfur coal over high sulfur coal?
Here are the choices:
A. lower cost
B. less erosion
C. less pollution
D. greater enerty | Low sulfur coal produces less pollution when burned than high sulfur coal. Name one factor that affects the sulfur content in coal. | C: less pollution. |
Wings of bats and birds serve the same function. which body part should you study to understand ancestral differences?
Here are the choices:
A. skull size
B. bones inside wings
C. skin and feathers
D. skin 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. | B: bones inside wings. |
The best thermal conductors are also the best conductors of what, which is also related to the density of free electrons in them?
Here are the choices:
A. electricity
B. pollution
C. light
D. sound | 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. | A: electricity. |
What tissue do clubmosses have that mosses do not?
Here are the choices:
A. chorophyll
B. dioxide tissue
C. nuclei
D. vascular tissue | Clubmosses can resemble mosses; however, clubmosses have vascular tissue, while mosses do not. | D: vascular tissue. |
The average human body contains 5,830 g of what?
Here are the choices:
A. bacteria
B. blood
C. muscle
D. water | 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?. | B: blood. |
What type of speciation occurs when groups from the same species are geographically isolated for long periods?
Here are the choices:
A. asexual
B. prokaryotic
C. symbiotic
D. 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:. | D: allopatric. |
What can damage the hair cells lining the cochlea of the inner ear?
Here are the choices:
A. unexpected sounds
B. amelodic sounds
C. wavering sounds
D. 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. | D: loud sounds. |
The boiling point of a solution is higher than the boiling point of the pure solvent, but the opposite occurs with this?
Here are the choices:
A. dissolving point
B. freezing point
C. evaporation point
D. liquidity 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... | B: freezing point. |
What is the network of vessels and tissues that carry a clear fluid called lymph called?
Here are the choices:
A. cleansing system
B. excretory system
C. lymphatic system
D. vessel 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... | C: lymphatic system. |
What is defined as the change of water from its liquid phase to its gaseous phase?
Here are the choices:
A. condensation
B. absorption
C. evaporation
D. transpiration | C: evaporation. | |
Radiation, chemicals, and infectious agents are types of what?
Here are the choices:
A. endogenous
B. mutations
C. dioxins
D. mutagens | Types of mutagens include radiation, chemicals, and infectious agents. | D: mutagens. |
What type of matter transmits light without scattering it?
Here are the choices:
A. translucent
B. bioluminescent
C. transparent
D. clean | 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. | C: transparent. |
Steam actually consists of tiny droplets of liquid what?
Here are the choices:
A. lead
B. methane
C. mercury
D. 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 ... | D: water. |
What mammalian class has the greatest ability to learn?
Here are the choices:
A. reptiles
B. humans
C. rats
D. apes | 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,... | B: humans. |
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?
Here are the choices:
A. somatic system
B. molecular circulation
C. systemic circulation
D. peripheral nervous system | 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... | C: systemic circulation. |
What causes polarization in a neutral object?
Here are the choices:
A. signaling of charges
B. meaning of charges
C. combining of charges
D. 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 ... | D: separation of charges. |
Cells in blood include red blood cells, white blood cells, and what?
Here are the choices:
A. plasmids
B. platelets
C. protons
D. droplets | Cells in blood include red blood cells, white blood cells, and platelets. | B: platelets. |
What substance is created when a copper turns from reddish brown to greenish brown?
Here are the choices:
A. rust
B. copper alloy
C. iron oxide
D. 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 ... | D: copper oxide. |
The egg shell membrane encloses the nucleus containing the genetic material and what?
Here are the choices:
A. exoskeleton
B. cerebellum
C. enamel
D. 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. | D: 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?
Here are the choices:
A. density
B. weight
C. pressure
D. mass | 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... | C: pressure. |
How many mass distinctions have radically altered the history of life?
Here are the choices:
A. one
B. six
C. five
D. four | C: five. | |
The vector sum of all the torques acting on an object is called what?
Here are the choices:
A. torque load
B. net torque
C. peak capacity
D. homeostasis | 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. | B: net torque. |
What determines how strongly an atom attracts electrons to itself?
Here are the choices:
A. gravity
B. electronegativity
C. ionization
D. enthalpy | The electronegativity of an atom determines how strongly it attracts electrons to itself. | B: electronegativity. |
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