The enzyme responsible for reverse transcription is

Options

A. RNA polymerase
B. Reverse transcriptase
C. DNA polymerase
D. Transcriptase

Answer

**Step-by-Step Solution:**

1. **Understanding Transcription and Reverse Transcription:**
- Transcription is the process where DNA is used as a template to synthesize RNA (specifically mRNA).
- Reverse transcription is the opposite process, where RNA is used as a template to synthesize DNA.

2. **Identifying the Enzymes Involved:**
- In normal transcription, the enzyme involved is RNA polymerase, which synthesizes RNA from a DNA template.
- In reverse transcription, we need an enzyme that can synthesize DNA from an RNA template.

3. **Evaluating the Options:**
- **A. RNA polymerase:** This enzyme is involved in transcription, not reverse transcription.
- **B. Reverse transcriptase:** This enzyme catalyzes the synthesis of DNA from an RNA template, making it the correct answer for reverse transcription.
- **C. DNA polymerase:** This enzyme synthesizes DNA from a DNA template, not from RNA.
- **D. Transcriptase:** This term is less commonly used and can refer to various types of polymerases, but it does not specifically refer to the enzyme responsible for reverse transcription.

4. **Conclusion:**
- The enzyme responsible for reverse transcription is **reverse transcriptase**.

**Final Answer:**
The enzyme responsible for reverse transcription is **B. Reverse transcriptase**.

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