The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ________ direction .

Options

A. only `5' to 3'`
B. only `3' to 5'`
C. Both (a) and (b)
D. None of these

Explanation

To answer the question "The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ________ direction," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of DNA Dependent RNA Polymerase**:
- DNA dependent RNA polymerase is an enzyme that synthesizes RNA from a DNA template during the process of transcription.

2. **Identify the Direction of Polymerization**:
- The enzyme catalyzes the addition of ribonucleotides to the growing RNA strand. This process occurs in a specific direction.

3. **Determine the Direction of Synthesis**:
- RNA polymerase synthesizes RNA in the 5' to 3' direction. This means that it adds nucleotides to the 3' end of the growing RNA molecule.

4. **Clarify the Concept of Antiparallel Strands**:
- DNA consists of two strands that run in opposite directions (antiparallel). The template strand for RNA synthesis is read in the 3' to 5' direction, allowing RNA synthesis to occur in the 5' to 3' direction.

5. **Final Answer**:
- Therefore, the correct answer to the question is that DNA dependent RNA polymerase catalyzes the polymerization reaction in the **5' to 3' direction**.

### Final Answer:
The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in **5' to 3' direction**.

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