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How can partial digestion appear on gel?

Answer and explanation

Correct answer: Uncut or larger intermediate bands with expected bands

Direct answer: Option A, a partial digest may show expected bands together with uncut or larger intermediate bands. In complete digestion, nearly every DNA molecule is cut at all available target sites. In partial digestion, enzyme amount, time, temperature, buffer, or DNA accessibility is insufficient for every molecule to finish. Some molecules remain uncut, while others are cut at only some sites. Therefore the gel may contain the original larger band, intermediate-sized fragments, and some expected final bands. Option A is correct. Option B is wrong because a ladder is a size reference and is normally loaded; its absence is not the defining pattern. Option C is wrong because the result concerns DNA bands, not only protein stain. Option D is wrong because a water lane cannot describe digestion. Exam cue: incomplete cutting produces a mixture, not one clean pattern.

Related tags

Partial DigestionIntermediate BandsGel

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