NEET Biology question

Restriction endonucleases: [AIPMT 2004]

(A)Are present in mammalian cells for degradation of DNA when the cell dies
(B)Are used in genetic engineering for ligating two DNA molecules
(C)Are synthesized by bacteria as part of in vitro DNA synthesis
(D)Are synthesized by bacteria as part of their defense mechanismCorrect

Answer: (D)

Solution

Restriction endonucleases are not a mammalian cell-death enzyme, do not ligate DNA (that is the role of ligase), and are not part of DNA synthesis, but are produced

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Question ID VK-125178