The two basic structural forms taken by most viruses are ____
a. polyhedral or enveloped
b. helical or enveloped
c. helical or polyhedral
d. cylindrical or polyhedral
e. cylindrical or enveloped
ANSWER: c
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a. is the usual basis of coordinated contractions. b. is the means by which rods prevent cones from being stimulated. c. refers to the lens adjustments that bring about precise focusing onto the retina. d. explains the mechanism for the operation of the calcium pump. e. is a protective function only.
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Indicate whether the statement is true or false