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 technique used to amplify DNA. In one cycle of PCR, the number of DNA molecules doubles because each DNA strand serves as a template for replication. Starting with two DNA molecules, after one cycle, the number doubles to four molecules.

• Option C is correct because 2 molecules become 4 after one PCR cycle.
• Options (A) and (B) represent DNA quantities after multiple PCR cycles.
• Option (D) is incorrect because the number does not stay the same or decrease.

Thus, the correct answer is (C) Four.