Which statement about the polymerase chain reaction (PCR) is correct?

A. PCR allows DNA to be cloned in a test tube and millions of copies can be made in hours.
B. PCR allows the synthesis of RNA from DNA molecules.
C. PCR is a natural process carried out by some viruses to amplify DNA molecules.
D. PCR is a man-made technique used to identify the nucleotide sequence of DNA.

A

There was a G2 question about whether D could also be correct in light of modern fluorescent DNA sequencing which involves PCR.  In questions such as this, candidates need to choose the most correct answer. This discriminated well and did not confuse candidates.