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 of their defence mechanism
Correct Answer: D
Solution :
Restriction enzymes are degradative enzymes which recognizes and cuts up DNA that is foreign to a cell. These enzymes protect bacteria against intruding DNA from other organisms such as virus or other bacterial cells.
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