Viruses
The function of a viral capsid is

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

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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 genome must be released in the cytoplasm
the host cell must be undergoing mitosis

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