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If enzyme activity remains after restriction digestion what is the risk in next cloning step?

Answer and explanation

Correct answer: Unwanted further cutting can occur

The direct answer is A: residual active restriction enzyme may cut the DNA again during the next cloning step. Digestion is intended to create particular DNA ends, after which ligase should join compatible ends. If active enzyme remains in the mixture, it may recognize the restriction site again and cut those ends, including newly ligated molecules if the site is restored. Step by step: digestion produces DNA ends; the mixture is transferred or used for ligation; leftover enzyme remains active under compatible conditions; it can make unwanted cuts; cloning efficiency or product integrity may fall. A is correct. B is wrong because DNA is not guaranteed to remain stable when an active nuclease is present. C is wrong because ligation does not automatically become perfect; it may be disrupted by further cutting. D is wrong because restriction digestion does not make protein. Cleanup, heat inactivation when appropriate, or a suitable reaction design can reduce the risk. Memory cue: “digest, then stop the cutter before joining.”

Related tags

Residual EnzymeUnwanted CuttingLigation

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