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Retrovirus  - an overview Retroviruses are viruses whose genetic material is RNA. They are retroviruses that are members of the Retroviridae family. After infecting a cell, it uses reverse transcription to change the RNA therein into DNA. After that, the host cell's DNA is exposed to this viral DNA, and it begins to replicate there. The Human Immunodeficiency Virus (HIV), for instance. Structure of Retroviruses Meaning of a retrovirus: A class of RNA viruses that replicate by introducing a DNA copy of their genome into their host cell. The envelope protein complex is embedded in the lipid bilayer, which is composed of two concentric outer circles. Hexagonal proteins make up capsids. The RNA genome is replicated in a loop that is held together by nucleoproteins.   The principal parts of a virion are: Wallet Env genes encode glycoproteins and lipids that make up the retroviral envelope. It fulfills three crucial purposes: Envelope  Env genes encode glycoproteins and lipids ...