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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.
A capsid is a virus's protein coat. It is virtually impenetrable and surrounds the viral DNA or RNA. 5 people found this useful. Edit. Share to: Judy Olmsted. 79,010 Contributions. Retired college science professor.