Transcription requires which of these enzyme ?

Options

A. RNA based RNA polymerase
B. RNA based DNA polymerase
C. DNA based RNA polymerase
D. DNA based DNA polymerase

Answer

To determine which enzyme is required for transcription, we can analyze the options provided:

1. **Understanding Transcription**: Transcription is the process of synthesizing RNA from a DNA template. The enzyme responsible for this process is crucial to know.

2. **Analyzing the Options**:
- **Option A: RNA based RNA polymerase**: This enzyme is involved in RNA replication, not transcription. Therefore, this option is incorrect.
- **Option B: RNA based DNA polymerase**: This enzyme is used in reverse transcription, where RNA is converted back into DNA. It does not play a role in transcription. Hence, this option is also incorrect.
- **Option C: DNA based RNA polymerase**: This is the enzyme that synthesizes RNA from a DNA template during transcription. This option is correct.
- **Option D: DNA based DNA polymerase**: This enzyme is involved in DNA replication, where DNA is synthesized from a DNA template. Thus, this option is incorrect.

3. **Conclusion**: The correct enzyme required for transcription is **DNA based RNA polymerase** (Option C).

### Final Answer:
The enzyme required for transcription is **DNA based RNA polymerase**.