Viruses
The oncogene theory refers to

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

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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 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

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