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

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

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Viruses
The function of a viral capsid is

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

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