GAATTC is the recognition site for the resetriction endonuclease

Options

A. EcoR I
B. Hind II
C. Eco R II
D. Bam HI

Answer

**Step-by-Step Solution:**

1. **Understanding Restriction Endonucleases**:
- Restriction endonucleases are enzymes that cut DNA at specific sequences known as recognition sites. These enzymes are crucial in recombinant DNA technology as they allow for the precise manipulation of DNA.

2. **Identifying the Recognition Site**:
- The recognition site mentioned in the question is GAATTC. This sequence is specifically recognized by the restriction endonuclease EcoRI.

3. **Function of EcoRI**:
- EcoRI recognizes the sequence GAATTC and makes a cut between the G and the A on each strand of the DNA. This creates "sticky ends," which are useful for ligating DNA fragments together.

4. **Comparing with Other Endonucleases**:
- Other restriction endonucleases have different recognition sites. For example:
- BamHI recognizes the sequence GGATCC and cuts between the two guanines.
- EcoRII recognizes the sequence CCWGG and cuts before the cytosine.

5. **Conclusion**:
- Since GAATTC is the recognition site for EcoRI, the answer to the question is that GAATTC is the recognition site for the restriction endonuclease EcoRI.