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On what principle can a DNA purification column work?

Answer and explanation

Correct answer: DNA binding on silica surface

The direct answer is A: DNA binding on a silica surface. In a common silica-column purification method, cells are lysed and unwanted material is removed or separated. Under suitable salt and pH conditions, DNA binds to the silica membrane. The reasoning is: add binding buffer; DNA attaches to silica; contaminants are washed away while DNA remains bound; change the conditions with an elution buffer, usually reducing salt, and DNA comes off into a clean solution. This is an adsorption-based purification principle, and the exact binding strength depends on the buffer conditions. Option A is correct because silica binding is the central principle of many DNA spin columns. Option B is wrong because protein smell is not used to purify DNA. Option C is incomplete and wrong: boiling water alone does not selectively bind, wash, and elute DNA. Option D is unrelated because cell growth is a biological process, not column purification. Exam cue: bind DNA, wash contaminants, elute DNA.

Related tags

Silica ColumnDna BindingDna Purification

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