Reverse transcriptase occurs in virus

Options

A. HIV
B. Influenza virus
C. Vaccinia virus
D. All tha above

Answer

To determine which virus contains reverse transcriptase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Reverse Transcriptase**:
- Reverse transcriptase is an enzyme that converts RNA into DNA. The DNA produced is known as complementary DNA (cDNA).

2. **Identify Retroviruses**:
- Retroviruses are a specific class of viruses that possess reverse transcriptase. They utilize this enzyme to replicate their RNA genome into DNA, which can then integrate into the host's genome.

3. **Examine the Given Viruses**:
- **HIV (Human Immunodeficiency Virus)**: This is a well-known retrovirus that contains reverse transcriptase.
- **Influenza Virus**: This is an RNA virus but is not classified as a retrovirus and does not contain reverse transcriptase.
- **Vaccinia Virus**: This virus belongs to the poxvirus family and is also not a retrovirus, hence it does not have reverse transcriptase.

4. **Evaluate the Options**:
- The options provided are:
- A) HIV
- B) Influenza Virus
- C) Vaccinia Virus
- D) All of the above
- Based on our analysis, only HIV is a retrovirus that contains reverse transcriptase.

5. **Conclusion**:
- The correct answer is **A) HIV**, as it is the only virus listed that contains reverse transcriptase.