Viruses
In cell culture, measles virus may lead to

rounding and aggregation of cells
syncytium formation
nuclear pyknosis
transformation of 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
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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Viruses
The oncogene theory refers to

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

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