Viruses
In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a

helical
icosahedral
polyhedra
penton

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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
All of these
serving as a vehicle of transmission from one host to another
protection against the viral genome from physical and enzymatic destruction

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