What is the primary purpose of PCR in DNA analysis?

• A. Copying and amplifying DNA for examination
• B. Sequencing entire genome
• C. Destroying DNA samples
• D. Creating proteins

Answer: (A)

The main idea here is how PCR functions in DNA analysis. PCR’s primary purpose is to copy and amplify a specific region of DNA so there’s enough material to examine. By cycling through heating and cooling with primers and a DNA polymerase, a tiny initial amount of DNA is turned into millions of copies of the target sequence. This abundance enables reliable testing and analysis, such as detecting a pathogen, performing genotyping, or preparing DNA for sequencing. It isn’t used to sequence an entire genome by itself, it doesn’t destroy DNA for analysis, and it doesn’t create proteins—those results come from sequencing whole genomes, handling or degrading samples, or carrying out transcription/translation, respectively.