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Which enzyme is active at 72° in the polymerase chain reaction?

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Which enzyme is active at 72° in the polymerase chain reaction?

(a) isomerase

(b) exonuclease

(c) polymerase

(d) endonuclease

I have been asked this question during an internship interview.

My query is from Techniques topic in division Techniques in Cell Biology of Cell Biology

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Right choice is (c) polymerase

Easy explanation: Taq polymerase, derived from the thermophilic bacteria Thermus aquaticus is active at 72°. The enzyme is responsible for synthesizing the complementary DNA strand by adding nucleotides to the 3’ end of the primers.

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