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Where can PCR inhibitors come from in DNA isolation?

Answer and explanation

Correct answer: From residual plant compounds, salts, phenol, or ethanol

During DNA isolation, contaminants such as plant polyphenols, excess salts, and residues of phenol or ethanol may remain with the DNA. They can interfere with DNA polymerase activity and reduce or stop PCR amplification. Properly purified DNA itself is not an inhibitor, so option A is correct. Exam tip: When PCR fails, consider contaminant carryover as well as the amount of DNA used.

Related tags

Pcr InhibitorsDna IsolationDna PurificationPlant CompoundsPhenolEthanolIsolation Of DnaProcesses Of Recombinant Dna Technology

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