A) present in mammalian cells for degeneration of DNA of dead cells
B) synthesised by bacteria for their defence
C) used for in vitro DNA synthesis
D) used in genetic engineering for uniting two DNA molecules
Correct Answer: B
Solution :
Restriction nucleases are found in bacteria and archaea and provide a defence mechanism against invading viruses. Inside bacteria, the restriction enzymes selectively cut up foreign DNA in a process called restriction. Host DNA is methylated by a modification enzyme (methylase) to protect it from restriction enzymes activity.
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