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

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

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

Viruses probably arose from small fragments of cellular chromosomes
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

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