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Under which condition does DNA bind to a silica column during DNA purification?

Answer and explanation

Correct answer: Under suitable salt conditions

Silica-column purification depends on the chemical environment of the binding mixture, not simply on temperature or appearance. In the presence of a suitable concentration of chaotropic salt, DNA becomes relatively dehydrated and can interact with the silica surface, while many proteins and other contaminants remain in the liquid or are removed during washing. After washing, a low-salt aqueous buffer or water rehydrates the DNA and releases it during elution. Therefore option B is correct. Low-temperature light and agar solidification do not create the necessary binding chemistry. Protein digestion may improve cleanliness, but by itself it does not guarantee DNA binding to silica.

Related tags

Silica ColumnDna BindingSalt ConditionsIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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