Which of the Following Is Not Part of the Process

Which of the following is not part of the process for PCR (polymerase chain reaction) ?

A) the use of an engineered DNA polymerase
B) the denaturing of the double-stranded DNA to yield single-strand DNA
C) multiple cycles of the chain reaction to yield a greater number of DNA copies
D) final product is single-stranded DNA
E) All of the answer choices are parts of the process for PCR.