Transcription of RNA is initiated when DNA dependent RNA polymerase binds to

Options

A. Operator
B. Regulator
C. Promoter
D. Terminator

Answer

**Step-by-Step Solution:**

1. **Understanding Transcription**: Transcription is the process where RNA is synthesized from a DNA template. This involves the conversion of the genetic information from DNA into messenger RNA (mRNA).

2. **Role of RNA Polymerase**: The enzyme responsible for this process is called DNA-dependent RNA polymerase. It binds to specific regions of the DNA to initiate the transcription process.

3. **Identifying the Binding Site**: For transcription to begin, RNA polymerase must bind to a specific region of the DNA. This region is crucial as it signals the start of the transcription process.

4. **Options Analysis**:
- **Option A: Operator**: This is a segment of DNA that a repressor binds to, inhibiting transcription. Therefore, it is not the correct answer.
- **Option B: Regulator**: This refers to genes that code for regulatory proteins but is not the site where RNA polymerase binds. Hence, it is incorrect.
- **Option C: Promoter**: This is the correct answer. The promoter is the region of DNA where RNA polymerase binds to initiate transcription.
- **Option D: Terminator**: This is a sequence that signals the end of transcription, so it is also incorrect.

5. **Conclusion**: Based on the analysis, the correct answer is **Option C: Promoter**. This is where the DNA-dependent RNA polymerase binds to start the transcription of RNA from DNA.