NEET 2004 Biology question

Restriction endonucleases :-

(1)Are used in genetic engineering for ligating two DNA molecules
(2)Are used for in vitro DNA synthesis
(3)Are synthesized by bacteria as part of their defense mechanismCorrect
(4)Are present in mammalian cells for degradation of DNA when the cell dies

Answer: (3)

Solution

Restriction endonucleases are bacterial enzymes that recognise specific palindromic sequences and cut the DNA; bacteria make them (together with modification methylases) to cut up and destroy the DNA of invading bacteriophages, i.e. as a defence

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Question ID VK-089461