During the "gap" phases of the cell cycle, most of the activity is directed toward
a. DNA replication.
b. nuclear membrane synthesis.
c. resting for the next step.
d. sorting the chromosomes.
e. processes required for cell division.
E
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Which of the following variables would support the "damage accumulation theory of aging"?
A. Poor diet and exposure to the sun lead to cellular damage. B. Protein fibers become cross-linked as we age. C. Harmful metabolites accumulate over our lifetime. D. None of these support the damage accumulation theory of aging. E. All of these support the damage accumulation theory of aging.
What type of plant would be least affected by the loss of the guard cell function that closes stomata?
A. a carnivorous plant B. a desert plant C. a rainforest plant D. a plant from the plains of the American midwest E. a poisonous plant
Which statement is NOT true about photoperiodism?
A. A long-day plant will flower when the day length is longer than a critical length. B. A short-day plant flowers when the day length is shorter than a critical length. C. A day-neutral plant flowers according to some form of regulation other than photoperiodism. D. The phytochrome form Pfr is converted to Pr in daylight, producing the active form that induces flowering in long-day plants.
The light-independent reactions of photosynthesis are those that
A. convert CO2 into reduced molecules (sugars). B. occur only at night. C. convert water into hydrogen and oxygen. D. convert glucose into energy. E. convert chlorophylls into light energy.