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Why can sequencing be useful after restriction digest?

Answer and explanation

Correct answer: To confirm exact insert sequence

Direct answer: Option A, sequencing can confirm the exact insert sequence. A restriction digest mainly answers questions such as whether fragments have expected sizes and whether selected sites were cut. A band of the expected length does not prove that every base is correct; a small mutation, deletion, insertion, or rearrangement may remain hidden. Sequencing reads the nucleotide order and can verify the insert and its junctions more directly. Option A is correct because it provides sequence-level confirmation after the preliminary digest check. Option B is wrong: sequencing is not used to colour an enzyme. Option C is wrong: it does not stop a gel. Option D is wrong: water cannot be changed into DNA by sequencing. The logical chain is digest for approximate structure, then sequencing for exact bases. Memory cue: size check is not sequence check.

Related tags

SequencingInsert ConfirmationMutation Check

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