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Viruses consist of a small collection of genetic material (DNA or RNA) encased in a protective protein coat called a capsid. (Retroviruses are among the infectious particles that use RNA as their hereditary material.
Rating Newest Oldest. Best Answer: A capsid is the protective protein coat that surrounds a virus. It has 2 functions: 1) protects the nucleic acid of the virus from attack by host's defensive cells 2) attaches to a specific receptor site of a cell membrane. Source(s): Jake Â· 6 years ago.