What does PCR stand for?

• A. Protein Chain Reaction
• B. Polymerase Chain Reaction
• C. Primer Copy Replication
• D. Polymerase Creating Regions

Answer: (B)

PCR is a technique used to amplify DNA, and the name reflects the parts of the process. The word Polymerase points to the enzyme that builds new DNA strands; Chain captures the idea that many copies are produced through repeated cycles; Reaction indicates this is a chemical process that generates those copies. So the standard expansion is Polymerase Chain Reaction.

The other phrases don’t fit because they either misname the enzyme or mischaracterize the process. Protein Chain Reaction would imply a protein-based chain reaction in a way that isn’t how PCR is described, Primer Copy Replication changes the emphasis to primers and copying without naming the enzyme or the amplification cycle, and Polymerase Creating Regions uses a different wording that doesn’t reflect the actual term.