Viruses
The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called

immunity repressor
immunity operon
none of these
operon repressor

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

All viruses are obligatory intracellular parasites
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

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