Laboratory Bio-Techniques · Zoology

The step of PCR in which double-stranded DNA separates into single strands is called:

  1. Annealing
  2. Extension
  3. Denaturation
  4. Termination
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Correct answer: Denaturation

Denaturation involves heating the DNA (typically to ~95 °C) to break the hydrogen bonds between complementary strands. This produces single-stranded DNA templates available for primer binding and amplification.

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