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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.
Protective middle layer of a bacterial which is made of peptidoglycan. Tail like structure that helps in the movement of the bacteria. Hair like structures that help in bacterial attachment to host cells and to other bacterial cells. Outer most layer of the bacteria cell, that provides extra protection and helps the bacteria attach to other cells and inanimate objects.