Inactivated viruses used in vaccines
a. multiply in the body at a low rate.
b. contain lysogenic proviruses that induce antibody formation.
c. act like drugs in the body.
d. cannot replicate in the body.
e. are produced by multiple transfers in tissue culture media.

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To avoid food poisoning, perishable items should not be stored in the refrigerator for more than days.

In many ways, the regulation of the genes of a particular group of viruses will be similar to the regulation of the host genes. therefore, which of the following would you expect of the genes of a bacteriophage? a) regulation via acetylation of histonesb) positive control mechanisms rather than negativec) control of more than one gene in an operond) reliance on transcription activators