Question

At the end of one cycle of PCR, two DNA molecules will become ________ .

• A. Eight
• B. Sixteen
• C. Four
• D. Two

Answer 1

The Correct Option is C

PCR (Polymerase Chain Reaction) is a DNA amplification technique. In a single PCR cycle, the DNA molecule count doubles as each strand acts as a replication template. Beginning with two DNA molecules, one cycle results in four molecules.

• Option C is correct as 2 molecules increase to 4 following one PCR cycle.
• Options (A) and (B) correspond to DNA quantities after multiple PCR cycles.
• Option (D) is incorrect; the quantity does not remain constant or decrease.

Therefore, the correct answer is (C) Four.