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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.
In the appropriate cell, DNA viruses are able to program the cell to replicate the virus using the genes contained within the viral DNA genome. 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.ike all viruses, DNA viruses are small when compared to the cells they infect and as such are obligate intracellular parasites (parasites that can only replicate within cells).