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If silica column is used in gel extraction what can DNA bind to?

Answer and explanation

Correct answer: silica membrane / Silica membrane

The direct answer is A: under suitable salt and binding conditions, DNA can bind to the silica membrane of the column. Gel extraction first separates DNA in agarose, after which the desired band is dissolved in a suitable buffer. Chaotropic salts help remove water around DNA and promote its binding to silica. Step by step: cut out the desired gel piece; dissolve the agarose; load the solution onto the silica column; DNA binds to the membrane while many impurities pass through; wash away contaminants; elute the DNA with a low-salt buffer or water. A is correct. B is wrong because the column’s binding surface is silica, not protein fiber. C is wrong because agar taste has no chemical role. D is wrong because water vapor cannot serve as the DNA-binding matrix. Binding and elution depend on correct pH, salt, and volume, so follow the kit protocol. Memory cue: “bind, wash, elute.”

Related tags

Silica MembraneGel ExtractionDna Binding

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