Viruses
The oncogene theory refers to

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

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

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

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