Assertion: Restriction enzymes recognise palindromic sequences.
Reason: Palindromic sequences read same in both directions of the two strands.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

Explanation

To solve the question, we need to analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Restriction enzymes recognize palindromic sequences."
- This is true. Restriction enzymes, also known as restriction endonucleases, are proteins that can cut DNA at specific sequences. Many of these sequences are palindromic, meaning they read the same forward and backward on complementary strands.

2. **Understanding the Reason**:
- The reason states that "Palindromic sequences read the same in both directions of the two strands."
- This is also true. A palindromic sequence in DNA means that if you read one strand from 5' to 3', the complementary strand reads the same from 3' to 5'. For example, the sequence 5'-GAATTC-3' on one strand has its complement 3'-CTTAAG-5', which reads the same in reverse.

3. **Evaluating the Relationship**:
- The assertion is true, and the reason is also true. Furthermore, the reason correctly explains why the assertion is true. The restriction enzymes recognize these palindromic sequences because they are structurally symmetrical, allowing the enzymes to bind effectively.

4. **Conclusion**:
- Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.