............. can be defined as a DNA sequence that serves as the binding site for RNA polymerase

Options

A. Terminator
B. Promoter
C. Structural gene
D. Both (a) and (c)

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific DNA sequence that serves as the binding site for RNA polymerase.

2. **Identifying Key Terms**: The terms mentioned in the options are: Terminator, Promoter, and Structural Gene. We need to understand what each of these terms means in the context of transcription.

3. **Defining the Terms**:
- **Promoter**: This is the DNA sequence where RNA polymerase binds to initiate transcription. It is located upstream of the gene that is being transcribed.
- **Terminator**: This is the sequence that signals the end of transcription. It tells RNA polymerase to stop synthesizing RNA.
- **Structural Gene**: This refers to the segment of DNA that is transcribed into RNA and ultimately translated into a protein.

4. **Focusing on the Process of Transcription**: The process of transcription involves RNA polymerase binding to the promoter, synthesizing RNA from the DNA template, and then terminating at the terminator sequence.

5. **Conclusion**: Since the question specifically asks for the binding site for RNA polymerase, the correct answer is **Promoter**.

**Final Answer**: Promoter

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