What is the key function of a DNA primer in the polymerase chain reaction (PCR) ?
A) It hybridizes to the beginning of a gene,creating a site for DNA polymerase to initiate DNA synthesis of the selected gene.
B) It aids in winding the newly produced DNA molecule with proteins to form a chromosome.
C) It catalyzes the separation of the two strands of DNA being copied.
D) It is the source of the four nucleotides needed in PCR.
E) It acts as a buffer to main a constant pH in the PCR solution.
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