NEET 2022 Zoology Restriction Enzymes Assertion Reason Question
Given below are two statements:
Statement I: Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.
Statement II: Restriction endonucleases cut the DNA strand a little away from the centre of the palindromic site.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Correct Answer
Detailed Explanation
Chapter: Biotechnology: Principles & Processes
Class: 12 | Topic: Restriction Enzymes | Difficulty: 🟡 Medium
✅ Ans: C — Both Statement I and Statement II are correct
- Statement I ✅: Restriction enzymes recognise specific palindromic DNA sequences.
- Statement II ✅: They cut the two DNA strands slightly away from the centre of the palindrome, producing sticky ends.
📌 NCERT: Restriction enzymes cut DNA at specific recognition sites, often producing sticky ends.
🧠 Quick Revision: Restriction enzyme → Palindromic sequence → Staggered cut → Sticky ends
Example:
Both statements → Correct → C
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