A) Exonuclease
B) Kinase
C) Polymerase
D) Endonuclease
Correct Answer: A
Solution :
Exonuclease enzyme activity means cleavage of nucleotides only at the end i.e., exonuclease enzyme digests nucleic acids beginning at a terminal nucleotide. . Endonuclease is an enzyme, which induces internal cuts or cleavages in a DNA molecule. Kinase is an enzyme that phosphorylates (adds a phosphate group to) a substrate, e.g., a protein kinase phosphorylates amino acids of another protein. Polymerase Chain Reaction (PCR) is a method of amplifying or copying DNA fragments that is faster than cloning. The fragments are combined with DNA polymerase, nucleotides and other components to form a mixture in which the DNA is cyclically amplified.
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