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Which of the following is not an application of PCR (Polymerase Chain Reaction)?
PCR is strictly an enzymatic gene/DNA amplification tool! It amplifies nucleic acids for molecular diagnosis, detects gene mutations, and amplifies scarce DNA. Protein purification requires downstream processing methods like chromatography and crystallization. Match Option (3)!
Polymerase Chain Reaction (PCR) is exclusively an enzymatic DNA polymerization assay utilizing thermostable DNA polymerase, oligonucleotide primers, and deoxynucleoside triphosphates ():
- Molecular diagnosis: Enables ultrasensitive early detection of infectious agents (e.g., HIV, Mycobacterium, viral hepatitis) before clinical symptoms appear. - Gene amplification: Yields microgram quantities of DNA from infinitesimal traces. - Detection of mutations: Identifies deletions, point mutations, and SNPs in suspected cancer patients and hereditary disorders.
PCR neither interacts with nor purifies proteins. Protein isolation and purification constitute downstream processing involving cell lysis, fractional centrifugation, filtration, and liquid chromatography (e.g., affinity chromatography).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Molecular diagnosis is a major, widely utilized application of PCR (detecting trace pathogen DNA).
Gene amplification is the fundamental primary function of PCR.
PCR cannot purify proteins; protein purification is performed via downstream chromatographic processing.
PCR followed by sequence analysis is routinely employed to detect point mutations, translocations, and cancer genes.
Students who skim the biotechnology chapters quickly forget that PCR only copies nucleic acids (DNA/RNA via RT-PCR). It has zero capacity to process or purify proteins.
"PCR is used for amplification of target gene, molecular diagnosis of pathogens, and detection of mutations. Protein purification is a component of downstream processing."
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