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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.
1-Nucleic acid (RNA or DNA which is the genetic blueprint) 2-Protein capsid (the protective layer of a virus made up of protein) 3-The tail (helps with mobility) 4-Some types of viruses but not all have a second layer derived from the host cell which is made of the phospholipid bilayer. 5-Viruses have no cytoplasm