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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.
Nucleic acid, which can be either DNA or RNA, encodes the genetic information that is necessary to make copies of the virus. The nucleic acid is surrounded by a protective protein coat, called a capsid. Some viruses are also surrounded by an outer membranous layer, called an envelope, made of lipid and protein.Capsid Morphology. The viral capsid is a protein coat that provides protection for viral nucleic acid and is a means of attachment to hostâs cells.It is composed of proteinaceous subunits called capsomeres.ou have free access to a large collection of materials used in a college-level introductory microbiology course. The Virtual Microbiology Classroom provides a wide range of free educational resources including PowerPoint Lectures, Study Guides, Review Questions and Practice Test Questions.