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Restriction endonucleases

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are present in mammalian cells for degradation of DNA when the cell dies

are used in genetic engineering for ligating two DNA molecules

are used for in vitro DNA synthesis

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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