Viruses
The oncogene theory refers to

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

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Viruses
The function of a viral capsid is

All of these
serving as a vehicle of transmission from one host to another
protection against the viral genome from physical and enzymatic destruction
providing binding sites that enable the virus to attach to specific receptor sites on the host cell

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