Viruses
The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as

Viruses
The function of a viral capsid is

All of these
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

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

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

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