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

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

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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
All viruses are obligatory intracellular parasites
Viruses have been successfully grown in pure cultures in test tubes
Viruses probably arose from small fragments of cellular chromosomes

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Viruses
The oncogene theory refers to

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

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