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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 extracellular form of a virus is known as a virion. For a DNA virus, the virion is composed of a set of DNA genes protected by a proteincontaining coat called a capsid. The coat is often characterized by regularity and symmetry in its structure and is capable of binding to and invading cells.