NEET Biology question

Which of the following statements does **not** hold true for restriction enzymes?

(A)It recognizes a palindromic nucleotide sequence
(B)It is an endonuclease
(C)It is isolated from virusesCorrect
(D)It produces the same kind of sticky ends in different DNA molecules

Answer: (C)

Solution

Restriction endonucleases are isolated from bacteria (as part of their restriction-modification defence system against bacteriophages), not from viruses — viruses are in fact the targets that these enzymes act against, which makes statement (c) false and hence the required answer. The other statements are all true:

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Question ID VK-125300