Viruses
The function of a viral capsid is

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

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Viruses
The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities

among different viral hosts than among different viruses
among different viral hosts than between viruses and their hosts
between viruses and their hosts than among different viruses
among different viruses than between viruses and their hosts

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