Q.

Restriction endonucleases

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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 used for in vitro DNA synthesis

d

are synthesized by bacteria as part defense mechanism 

answer is D.

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Detailed Solution

Restriction endonucleases are a group of enzymes in bacteria that protect them from viruses by destroying viral DNA incorporated into bacteria during infection.

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