NEET Biology question

The following statements describe the characteristics of the enzyme restriction endonuclease. Identify the **incorrect** statement. **[NEET 2021]**

(A)The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
(B)The enzyme cuts the DNA molecule at an identified position within the DNA
(C)The enzyme binds DNA at specific sites and cuts only one of the two strandsCorrect
(D)The enzyme cuts the sugar-phosphate backbone at specific sites on each strand

Answer: (C)

Solution

A restriction endonuclease cuts **both** strands of the double-stranded DNA molecule at (or near) its recognition site — it does not cut only one strand — so statement (c) is the incorrect one. Statements (a), (b) and (d) correctly describe the enzyme's

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Question ID VK-125312