A) used for in vitro DNA synthesis
B) synthesised by bacteria as part of their defense mechanism
C) present in mammalian cells for degradation of DNA when the cells dies
D) used in genetic engineering for ligating two DNA molecules
Correct Answer: B
Solution :
Restriction endonucleases are synthesised by bacteria as part of their defence mechanism. Restriction endonuclease is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites. These enzymes are found in bacteria and provide a defence mechanism against viruses by cleaning the toxic viral DNA.
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