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

immunity operon
operon repressor
none of these
immunity repressor

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Viruses
The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities

among different viruses than between viruses and their hosts
among different viral hosts than among different viruses
between viruses and their hosts than among different viruses
among different viral hosts than between viruses and their hosts

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

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

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