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
In order for a virus to replicate

the host cell must lack a cell membrane
the capsid must enter the host cell cytoplasm
the host cell must be undergoing mitosis
the genome must be released in the cytoplasm

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