Viruses
Usually viruses are separated into several large groups based primarily on

diameter of the viroin or nucleocapsid
capsid symmetry
nature of the host
nucleic acid characteristics

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Viruses
The function of a viral capsid is

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

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