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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 protein layer that encloses the nucleic acid of a phage or virus and protects it from the environment. Carbon source. A nutrient which provides the carbon required for cellular biosynthesis. capsid. The protein shell that encloses the viral genome; rod-shaped, polyhedral, or more completely shaped. capsule ...