GAATTC is the recognization site for which of the following restriction endonuclease

Options

A. Hin d III
B. Eco R 1
C. Bam I
D. Hae III

Answer

To determine which restriction endonuclease recognizes the sequence GAATTC, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the restriction endonuclease that recognizes the specific DNA sequence GAATTC.

2. **Identify the Options**: The options provided are:
- Hind III
- Eco RI
- Bam HI
- Hae III

3. **Know the Recognition Sites**: Each restriction endonuclease has a unique recognition site where it cuts the DNA. We need to recall or look up the recognition sites for each of the listed enzymes:
- **Hind III**: Recognizes the sequence AAGCTT
- **Eco RI**: Recognizes the sequence GAATTC
- **Bam HI**: Recognizes the sequence GGATCC
- **Hae III**: Recognizes the sequence GGCC

4. **Match the Sequence**: Now, we compare the recognition sites of the enzymes with the given sequence GAATTC:
- Hind III: AAGCTT (not a match)
- Eco RI: GAATTC (match)
- Bam HI: GGATCC (not a match)
- Hae III: GGCC (not a match)

5. **Conclusion**: Since Eco RI is the only enzyme that recognizes the sequence GAATTC, the answer is Eco RI.

### Final Answer:
The restriction endonuclease that recognizes the sequence GAATTC is **Eco RI**.

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