A virus that uses RNA to make DNA is referred to as a(n)

a. retrovirus.
b. archaevirus.
c. parvovirus.
d. poxvirus.
e. papovavirus.


A

Biology & Microbiology

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Nudibranchs belong to the class ____ of the phylum Mollusca

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A) contracts when stretched. B) is under voluntary control. C) does not contain actin or myosin. D) produces rapid contractions.

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Which part of the immune system's "learning system" is responsible for maintaining life-long immunity against measles after a measles infection?

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