Viruses
The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by

lytic infection by other viruses
none of these
the prophage
Both (a) and (b)

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Viruses
The oncogene theory refers to

how viruses transform normal cells into tumor cells
how viruses replicate in host cells
how chemicals inactivate viruses when applied
none of these

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Viruses
Which of the following statements is not true of viruses?

All viruses have either DNA or RNA as their genetic material
Viruses have been successfully grown in pure cultures in test tubes
Viruses probably arose from small fragments of cellular chromosomes
All viruses are obligatory intracellular parasites

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