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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.
Viruses can be found either inside a cell (intracellular) or outside of a cell (extracellular). If it is found extracellular, the virus is called a virion. A virion contains a protein coating called a capsid, which surrounds the core of the virus containing the nucleic acid (either DNA or RNA).Together with the capsid and the DNA or RNA core is called a nucleocapsid.Some virions also contain an envelope which is made up of a phospholipid membrane.hey are not within any kingdom and carry their own significant characteristics. 1  obligate intracellular parasite â require a host to cause damage. 2  filterable â small enough to be filtrated. 3  contains an outer protein coat and inner genome. 4  has only 1 kind of nucleic acid (RNA or DNA, but never both).