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Pregunta 1
Pregunta
The fossil record of ancient life forms provides scientific evidence of
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direct harvesting
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selective breeding
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gene manipulation
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evolutionary changes
Pregunta 2
Pregunta
Which situation results in a characteristic that is inheritable?
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A limb is lost when two marine organisms fight.
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A puppy learns to beg for food by watching an older dog perform tricks.
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A gene is inserted into a bacterium, allowing the organism to produce insulin.
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A random mutation causes the immediate death of a microbe.
Pregunta 3
Pregunta
Which statement explains the importance of maintaining a constant internal environment to ensure proper enzyme functioning?
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Changes in pH and temperature will cause the enzyme reaction rate to be too fast.
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Temperature and pH determine amino acid sequences in enzymes.
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Changes in pH will change the genetic instructions of enzymes.
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Increasing the temperature and pH can alter the specific shape of enzymes.
Pregunta 4
Pregunta
The major function of the placenta is to
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cushion the fetus so it won’t be hurt when the mother moves.
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exchange food, oxygen, and waste between mother and fetus.
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store food for the fetus.
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support the egg for the process of fertilization.
Pregunta 5
Pregunta
Which statement best describes an ecosystem maintaining a state of approximate equilibrium?
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Nutrients from decayed organisms are recycled in a forest ecosystem.
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All the frog species in a South American rain forest become extinct.
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A mutation spreads through a species of bacterium, making them unable to decompose wastes.
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Mice are released into a field ecosystem as food for a declining predator population.
Pregunta 6
Pregunta
Which characteristic of a geographic region would have the greatest influence on the type of ecosystem that forms in that region?
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ratio of autotrophs to heterotrophs
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concentration of atmospheric oxygen
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number of food chains
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climatic conditions
Pregunta 7
Pregunta
Growing exotic (nonnative) plant species in parks and gardens could lead directly to an increase in the
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biodiversity of the autotrophs that feed on them.
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populations of native carnivores.
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competition between them and native producers.
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breeding between them and native herbivores.
Pregunta 8
Pregunta
Growing exotic (nonnative) plant species in parks and gardens could lead directly to an increase in the
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biodiversity of the autotrophs that feed on them.
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populations of native carnivores.
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competition between them and native producers.
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breeding between them and native herbivores.
Pregunta 9
Pregunta
On hot, dry days, guard cells often close microscopic openings in plant leaves, conserving water. This is an example of
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environmental factors causing gene mutation in plants
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finite resources acting as selecting agents for evolution
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a feedback mechanism for maintaining homeostasis
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differentiation in plants as a result of stimuli
Pregunta 10
Pregunta
In the human body, oxygen is absorbed by the lungs and nutrients are absorbed by the small intestine. In a single-celled organism, this absorption directly involves the
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nucleus
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chloroplasts
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cell membrane
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mitochondria
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