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
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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.
Which structure stores motile sperm?
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
True or false: tonicity describes the effect of a solution on the movement of water
a. true b. false
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