Restriction enzyme Eco RI cuts the DNA between bases G and A only when the sequence in DNA is

Options

A. GATATC
B. GAATTC
C. GATTCC
D. GAACTT

Answer

To determine the DNA sequence that the restriction enzyme Eco RI cuts, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Restriction Enzymes**:
- Restriction enzymes, also known as restriction endonucleases, are proteins that cut DNA at specific sequences. Each restriction enzyme recognizes a particular sequence of nucleotides.

2. **Identifying Eco RI**:
- Eco RI is a specific restriction enzyme that is derived from the bacterium E. coli. The strain of E. coli from which Eco RI is isolated is called RY113.

3. **Recognizing the Cut Site**:
- Eco RI recognizes and cuts the DNA at a specific sequence of six base pairs. The sequence that Eco RI targets is crucial for understanding where the cuts will occur.

4. **Determining the Sequence**:
- The specific sequence that Eco RI recognizes is G A A T T C. This means that Eco RI will cut the DNA between the bases G and A in this sequence.

5. **Understanding Palindromic Sequences**:
- The sequence G A A T T C is a palindromic sequence. This means that it reads the same forwards and backwards. In the context of DNA, this is important because it allows the enzyme to bind and cut effectively.

6. **Final Answer**:
- Therefore, the DNA sequence that Eco RI cuts is G A A T T C.