The requirement of cold weather before a

particular plant process occurs (e.g.,
germination) is known as
a. the biological clock.
b. vernalization.
c. photoperiodism.
d. biennial life cycle.
e. biorhythm.


B

Biology & Microbiology

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Cell division is regulated by:

A. growth factor signals. B. signals that indicate a sufficient size of the cell. C. signals that indicate that DNA has been replicated. D. signals about the nutritional status of the cell. E. All of these choices are correct.

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Which structure stores motile sperm?

A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland

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True or false: tonicity describes the effect of a solution on the movement of water

a. true b. false

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Which of the following is the best description of a precursor metabolite?

A. A macromolecule consumed in the first steps of metabolism B. An intermediate in the formation of cursor metabolites C. A carbon skeleton used as a starting substrate D. An enzyme that is reduced in a metabolic reaction

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