GAATTC is recognition site of restriction endonuclease

Options

A. Hind III
B. Eco RI
C. BamH I
D. Hae III

Answer

To solve the question regarding the recognition site of the restriction endonuclease GAATTC, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the recognition site of the restriction endonuclease that corresponds to the nucleotide sequence GAATTC.

2. **Identify the Restriction Endonucleases**: The problem provides four restriction endonucleases: Hind III, EcoRI, BamH1, and HaeIII. We need to determine which of these recognizes the sequence GAATTC.

3. **Recall the Recognition Sites**:
- **Hind III**: Recognizes the sequence AAGCT.
- **EcoRI**: Recognizes the sequence GAATTC.
- **BamH1**: Recognizes the sequence GGATCC.
- **HaeIII**: Recognizes the sequence GGCC.

4. **Match the Recognition Site**: Compare the provided sequence GAATTC with the recognition sites of the listed restriction endonucleases.

5. **Identify the Correct Enzyme**: From the comparison, it is clear that EcoRI is the only enzyme that recognizes and cuts at the sequence GAATTC.

6. **Conclusion**: Therefore, the correct answer to the question is EcoRI, as it is the restriction endonuclease that recognizes the nucleotide sequence GAATTC.

### Final Answer:
EcoRI is the restriction endonuclease that recognizes the sequence GAATTC.

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