The specific DNA sequence where EcoRI cuts is

Options

A. G A TT C G
B. G A A T T C
C. G T T C A A
D. T T C C A A

Answer

### Step-by-Step Solution:

1. **Understanding EcoRI**: EcoRI is a type of restriction enzyme, also known as a restriction endonuclease. It recognizes specific DNA sequences and cuts the DNA at those sites.

2. **Identifying the Specific Sequence**: The specific DNA sequence where EcoRI cuts is a palindromic sequence. A palindromic sequence is one that reads the same forwards and backwards.

3. **The Sequence**: The specific palindromic sequence recognized by EcoRI is **G A A T T C**. When read from left to right, it is G A A T T C, and when read from right to left, it is still C T T A A G, which confirms its palindromic nature.

4. **Cutting Action**: EcoRI cuts this sequence at a specific location, which is slightly away from the center of the palindromic sequence. This means that it will cut the DNA strand at the G and A of the G A A T T C sequence.

5. **Result of the Cut**: When EcoRI cuts the DNA, it creates sticky ends. These sticky ends can be used to join with other DNA fragments that have complementary sequences.

6. **Conclusion**: Therefore, the specific DNA sequence where EcoRI cuts is **G A A T T C**.

### Final Answer:
The specific DNA sequence where EcoRI cuts is **G A A T T C**.

---