retrovirus
Chapter: 4
Retroviruses are a class of RNA viruses that are capable of converting their RNA into DNA, and integrating into the host genome. They do this through the action of reverse transcriptase, an enzyme found only in retroviruses. By incorporating themselves into the host genome, the viruses share the property of latency, whereby they can transcribe another copy of themselves at any time and become active within the cell cytoplasm again.