Viruses
The most popular indirect method of counting virus particles is by

hemagglutination assay
colony counting
plaque-assay
counting plaque-forming units

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Viruses
The function of a viral capsid is

All of these
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
protection against the viral genome from physical and enzymatic destruction

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