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What is the main difference between gel extraction and PCR cleanup?

Answer and explanation

Correct answer: Gel extraction recovers a selected gel band, whereas PCR cleanup purifies the reaction mixture without selecting a band

Gel extraction includes an electrophoresis and selection step. DNA fragments are separated by size in agarose, the desired band is identified and excised, and the DNA is recovered from that piece of gel. It is therefore useful when a particular product must be separated from nonspecific PCR products, primer dimers, or other bands. PCR cleanup usually purifies the complete reaction mixture directly, commonly removing primers, nucleotides, salts, polymerase, and short contaminants while retaining the amplifiable DNA product. It does not select a visible band by position in a gel. Thus option A is correct. B, C, and D confuse purification methods with protein synthesis, restriction digestion, or enzymes.

Related tags

Gel ExtractionPcr CleanupDna PurificationIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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