Which of the following correctly depicts the recognition site for EcoRI ?
(a) `{:(G-A-Aoverset(darr)-T-T-C),(C-T-Tunderset(uarr)-A-A-G):}`
(b) `{:(G-T-Coverset(darr)-G-A-C),(C-A-Gunderset(uarr)-C-T-G):}`
(c) `{:(Goverset(darr)-T-C-G-A-C),(C-A-G-C-Tunderset(uarr)-G):}`
(d) `{:(Goverset(darr)-A-A-T-T-C),(C-T-T-A-Aunderset(uarr)-G):}`

Options

A. `{:(G-A-Aoverset(darr)-T-T-C),(C-T-Tunderset(uarr)-A-A-G):}`
B. `{:(G-T-Coverset(darr)-G-A-C),(C-A-Gunderset(uarr)-C-T-G):}`
C. `{:(Goverset(darr)-T-C-G-A-C),(C-A-G-C-Tunderset(uarr)-G):}`
D. `{:(Goverset(darr)-A-A-T-T-C),(C-T-T-A-Aunderset(uarr)-G):}`

Explanation

To determine which option correctly depicts the recognition site for EcoRI, we need to analyze the characteristics of EcoRI and its recognition site.

### Step-by-Step Solution:

1. **Understanding EcoRI**: EcoRI is a restriction enzyme that recognizes specific DNA sequences and cuts them. It is known to cut at a palindromic sequence, which means the sequence reads the same in both directions.

2. **Identifying the Recognition Sequence**: The recognition site for EcoRI is specifically known to be:
- **5' - G/AATTC - 3'**
- **3' - CTTAA/G - 5'**
Here, the slash (/) indicates the position where EcoRI cuts the DNA, between the G and A nucleotides.

3. **Analyzing the Options**:
- **(a)** `{:(G-A-Aoverset(darr)-T-T-C),(C-T-Tunderset(uarr)-A-A-G):}` - This does not match the EcoRI recognition sequence.
- **(b)** `{:(G-T-Coverset(darr)-G-A-C),(C-A-Gunderset(uarr)-C-T-G):}` - This does not match the EcoRI recognition sequence.
- **(c)** `{:(Goverset(darr)-T-C-G-A-C),(C-A-G-C-Tunderset(uarr)-G):}` - This does not match the EcoRI recognition sequence.
- **(d)** `{:(Goverset(darr)-A-A-T-T-C),(C-T-T-A-Aunderset(uarr)-G):}` - This correctly represents the EcoRI recognition site, with the cut occurring between G and A.

4. **Conclusion**: Based on the analysis, the correct option that depicts the recognition site for EcoRI is **(d)**.

### Final Answer:
**(d)** `{:(Goverset(darr)-A-A-T-T-C),(C-T-T-A-Aunderset(uarr)-G):}`

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