Question

Isoschizomers recognize ..................

• A. Same recognition sequence but different recognition site
• B. Same recognition site and same recognition sequence
• C. Same recognition site and different recognition sequence
• D. Different recognition site and different recognition sequence

Hint:

Isoschizomers are restriction enzymes that have identical recognition sequences and cut at the same sites, although they may come from different sources.

Answer 1

The Correct Option is B

Isoschizomers are restriction enzymes that recognize the same recognition sequence and cut at the same recognition site in DNA.
(1) Same recognition sequence but different recognition site: This is incorrect because isoschizomers recognize the same recognition site, not a different one.
(2) Same recognition site and same recognition sequence: This is the correct answer. Isoschizomers recognize the same DNA sequence and cleave at the same location.
(3) Same recognition site and different recognition sequence: This is incorrect because isoschizomers recognize the same sequence, not a different one.
(4) Different recognition site and different recognition sequence: This is incorrect because this describes different restriction enzymes, not isoschizomers.
Conclusion: The correct answer is Option 2: Same recognition site and same recognition sequence.