Viruses
The function of a viral capsid is

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
serving as a vehicle of transmission from one host to another
All of these

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Viruses
The oncogene theory refers to

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

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