Reverse transcriptase is an enzyme contained in:

Explanation

Reverse transcriptase is an enzyme contained in retroviruses, such as HIV (Human Immunodeficiency Virus). This enzyme allows the virus to convert its RNA genome into DNA after entering a host cell, a process called reverse transcription. The newly formed viral DNA is then integrated into the host cell's genome, enabling the virus to use the host's machinery to produce new viral particles. Reverse transcriptase is essential for the replication of retroviruses and is a key target for antiviral drugs that aim to inhibit HIV replication.