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

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
Viruses probably arose from small fragments of cellular chromosomes

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Viruses
The oncogene theory refers to

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

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