A) Synthesized by bacteria as part of their defence mechanism.
B) Used for in vitro DNA synthesis.
C) Used in genetic engineering for ligating two DNA molecules.
D) Present in mammalian cells for degradation of DNA when the cell dies.
Correct Answer: A
Solution :
Restriction endonucleases are enzymes that are specialized to cut the DNA at specific sites in the regions having palindromic sequences. They are present in bacteria for deteriorating the genome of the invading virus. Hence, the correct option is [a].
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