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

plaque-assay
counting plaque-forming units
colony counting
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
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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