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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.
the core of the virus is the capsid. The genome surrounds the capsid, and the virus may or may not have an outer layer called an envelope. the genome is surrounded by a protein coat called a capsid, which may or may not be surrounded by an envelope. the envelope is in the central portion of the virus.