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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.
Best Answer: A complete virus particle, known as a virion, consists of nucleic acid surrounded by a protective coat of protein called a capsid.These are formed from identical protein subunits called capsomers.[53] Viruses can have a lipid envelope derived from the host cell membrane.The capsid is made from proteins encoded by the viral genome and its shape serves as the basis for morphological distinction.hese are formed from identical protein subunits called capsomers.[53] Viruses can have a lipid envelope derived from the host cell membrane. The capsid is made from proteins encoded by the viral genome and its shape serves as the basis for morphological distinction.