Final answer:
HIV brings the enzyme reverse transcriptase into a cell, allowing it to transcribe its RNA into DNA and integrate it into the host's genome.
Therefore the correct answer is option is a) Reverse transcriptase
Step-by-step explanation:
The component that is brought into a cell by HIV is reverse transcriptase. This enzyme is crucial for the replication of HIV because it allows the virus to transcribe its RNA genome into DNA within the host cell.
Once inside the cell, reverse transcriptase converts the viral RNA into DNA, which can then be integrated into the host cell's genome with the help of the enzyme integrase. By targeting reverse transcriptase with specific inhibitors, the replication of HIV can be curtailed, which forms a foundational strategy in the treatment of HIV/AIDS.