Restriction endonuclease Hind II always cuts DNA molecule at a particular point by recognising a specific sequence of

Options

A. Six base pairs
B. Five base pairs
C. Four base pairs
D. Seven base pairs

Answer

**Step-by-Step Solution:**

1. **Understanding Restriction Endonucleases**:
- Restriction endonucleases, also known as restriction enzymes, are proteins that cut DNA at specific sites. They are essential tools in molecular biology for DNA manipulation.

2. **Function of Hind II**:
- Hind II is a specific type of restriction endonuclease that recognizes and cuts DNA at a particular sequence.

3. **Recognition of Specific Sequences**:
- These enzymes recognize specific sequences of nucleotides in the DNA. The sequence recognized by Hind II is a palindromic sequence.

4. **Definition of Palindromic Sequence**:
- A palindromic sequence in DNA is a sequence that reads the same forwards and backwards. For example, if you have a sequence like GAATTC, reading it from the left (5' to 3') gives GAATTC, and reading it from the right (3' to 5') also gives GAATTC.

5. **Length of the Recognized Sequence**:
- The specific palindromic sequence recognized by Hind II is 6 base pairs long. This means that Hind II will cut the DNA at this 6 base pair sequence.

6. **Conclusion**:
- Therefore, the restriction endonuclease Hind II cuts the DNA molecule at a specific palindromic sequence that is 6 base pairs in length.

**Final Answer**: Hind II recognizes a specific palindromic sequence that is 6 base pairs long.

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