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CGP EDU Academic Team
Published on: August 12, 2026
The first step in the PCR is
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Verified by ExpertsThe correct answer is:
A
The first step in PCR (Polymerase Chain Reaction) is denaturation, where the double-stranded DNA is heated (around 94–96°C) to separate it into single strands by breaking hydrogen bonds.
Annealing → primers bind (second step)
Extension → DNA synthesis by Taq polymerase (third step)
Cooling → not a standard named step in PCR cycle
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