Term
Scientists have altered crop plants to make them more resistant to insects and disease. Which of these processes makes it possible for scientists to alter plants?
F natural selection
G gene splicing
H adaptation
I chemosynthesis |
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Definition
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Term
A student wants to examine chromosomes from animal cells. Which of these would be the best tool for the student to use?
A litmus paper
B thermometer
C dissecting microscope
D compound microscope |
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Definition
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Term
which of these instruments should a student use to measure the length of a housefly?
A microscope
B metric ruler
C funnel
D graduated cylinder |
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Definition
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Term
A student wants to perform an iinvestigation to determine the heart rate of a rabbit. The teachers tells her the heart rate should be about l00 beats per minute. How could this information affect the investigation?
A It could introduce bias.
B It coul |
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Definition
| A It could introduce bias. |
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Term
The cell wall of a plant helps the plant cell maintain its shape. What is the main structural component of the cell wall of a plant?
A lipid
B cellulose
C amino acid
D nucleic acid |
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Definition
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Term
In addition to eating fish eggs, the arctic grayling also eats insects and small fish. What is the ecological role of the arctic grayling?
F herbivore
G decomposer
H omnivore
J carnivore |
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Definition
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Term
When the cells of most organisms freeze, they burst. Which property of water causes this to occur?
A water is a universal solvenet
B water changes temperature rapidly
C water is less dense as a solid than as a liquid.
D water is a nonpolar molecule. |
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Definition
| C water is less dense as a solid than as a liquid. |
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Term
During photosynthesis, trees convert carbon dioxide and other materials to
A lipids
B amino acids
C nucleic acids
D sugars |
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Definition
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Term
Which of these would lead to an increase in carbon dioxide in the atmosphere?
F a decrease in respiration
G a decrease in the ozone layer
H an increase in photosynthesis
J an increase in the burning of fossil fuels |
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Definition
| J an increase in the burning of fossil fuels |
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Term
Which of these is an example of feedback in a biological system?
A the movement of salts from cells into the bloodstream.
B the release of insulin into the bloodstream when blood sugar increases.
C the decrease in oxygen levels in the blood after vigor |
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Definition
| B the release of insulin into the bloodstream when blood sugar increases |
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Term
which of these is the process by which water moves across a selectively permeable membrane?
A osmosis
G transpiration
H capillary action
J active transport |
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Definition
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Term
Rabbits that live in warm climates have larger ears than rabbits that live in cold climates. Larger ears allow rabbits to cool themselves by releasing body heat. Which term desribes this characteristic?
F alternation
G mutation
H adaptation
J recomb |
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Definition
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Term
In an estuary ecosystem, if the blue crab eats widgeon grass and clams, which of these best describes the role of the blue crab in the estuary ecosystem?
A carnivore
B herbivore
C producer
D omnivore |
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Definition
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Term
Which of these is an abiotic factor that affects the organisms in the estuary ecosystem?
A the amount of bacteria in the water
B the number of copepods (an organism fish feed on)
C the amount of salt in the water
D the number of scavengers |
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Definition
| C amount of salt in the water |
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