Given below is a sample of a protein of DNA strand giving the base sequence on the opposite strands . What is so special shown in it ?
5'______GAATTC______3'
3'______CTTAAG______5'

Options

A. Palindromic sequence of base pairs
B. Replication completed
C. Deletion mutation
D. Start codon at the 5' end

Answer

To solve the question regarding the special feature of the given DNA base sequence, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Sequences**:
The DNA sequences provided are:
- 5' - GAATTC - 3'
- 3' - CTTAAG - 5'

2. **Understand the Orientation**:
The sequences are written in a 5' to 3' direction for one strand and a complementary 3' to 5' direction for the opposite strand.

3. **Analyze the Base Pairing**:
The base pairing rules in DNA state that:
- Adenine (A) pairs with Thymine (T)
- Cytosine (C) pairs with Guanine (G)
In this case, we can see that:
- G pairs with C
- A pairs with T
- A pairs with T
- T pairs with A
- T pairs with A
- C pairs with G

4. **Check for Palindromic Nature**:
A palindromic sequence reads the same in both directions. If we read the sequence 5' - GAATTC - 3' from left to right, and the complementary sequence 3' - CTTAAG - 5' from right to left, we find that both sequences are identical when read in reverse.

5. **Conclusion**:
The special feature of the given DNA sequence is that it is a **palindromic sequence**. This means that the sequence can be read the same way in both directions, which is a characteristic of certain DNA sequences that often play important roles in molecular biology, such as recognition sites for restriction enzymes.

### Final Answer:
The special feature shown in the given DNA strand is that it is a **palindromic sequence**.

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