Starting with a single molecule of DNA, the PCR was allowed to go through 3 complete cycles. How many molecules would be produced?

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Multiple Choice

Starting with a single molecule of DNA, the PCR was allowed to go through 3 complete cycles. How many molecules would be produced?

Explanation:
PCR amplifies DNA exponentially: each cycle roughly doubles the amount of target DNA because every existing molecule serves as a template for a new copy. Starting with a single DNA molecule, the first cycle yields two copies, the second cycle yields four, and the third cycle yields eight. So, after three complete cycles, you’d expect eight molecules of the target DNA, assuming near-perfect efficiency and that each cycle proceeds to completion. This illustrates how PCR builds an exponential number of copies very quickly.

PCR amplifies DNA exponentially: each cycle roughly doubles the amount of target DNA because every existing molecule serves as a template for a new copy. Starting with a single DNA molecule, the first cycle yields two copies, the second cycle yields four, and the third cycle yields eight. So, after three complete cycles, you’d expect eight molecules of the target DNA, assuming near-perfect efficiency and that each cycle proceeds to completion. This illustrates how PCR builds an exponential number of copies very quickly.

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