Question

a denaturing
b annealing
c extension
d none of the above
primers to bind to the dna sequence.
involves cooling the single strands of dna to allow the

Explanation:

In PCR (Polymerase Chain Reaction), the annealing step involves cooling the single - stranded DNA. This cooling allows the primers (short DNA sequences) to bind to their complementary sequences on the single - stranded DNA template.

• Denaturing (a) is the step where the double - stranded DNA is heated to separate into single strands.
• Extension (c) is the step where DNA polymerase synthesizes new DNA strands using the primers as starting points.

Answer:

B. Annealing