Living cells are required for culturing viruses because
A) viruses are technically nonliving.
B) viruses require host cell genetic machinery to replicate.
C) viruses are obligate intracellular parasites.
D) All of the choices are correct.
Ans: D) All of the choices are correct.
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Regarding seedless fruits, which of the
following is paired incorrectly?
a. seedless grapes--embryos abort b. bananas--natural triploid sterility c. seedless watermelons--induced triploid sterility d. navel oranges--sprouted from corms e. all of these are paired correctly
The hormones that are most directly involved with the process of birth are
a. estrogen and oxytocin. b. oxytocin and prostaglandins. c. oxytocin and progesterone. d. prolactin and estrogen. e. prostaglandin and progesterone.
Somatosatin functions to inhibit both insulin and glucagon.
a. true b. false
Blood flow through capillaries is controlled by
A) one-way valves. B) precapillary sphincters only. C) smooth muscle in the walls of arterioles only. D) precapillary sphincters and smooth muscle in the walls of arterioles.