Viruses
The oncogene theory refers to

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

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Viruses
In order for a virus to replicate

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

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