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What may be needed to improve blunt-end ligation?

Answer and explanation

Correct answer: More suitable ligase conditions

The direct answer is A: more suitable ligase conditions may be needed. Blunt ends have no single-stranded overhanging bases. Therefore, unlike sticky ends, they cannot first hold together through complementary base pairing, and ligation is often less efficient. The reaction may be improved by choosing an appropriate DNA ligase, using suitable temperature and buffer conditions, providing ATP or the required cofactor, increasing DNA concentration, or allowing enough reaction time. Option A is correct because it describes the kind of practical improvement that can help. Option B is wrong because DNA is the substrate to be joined; removing it makes ligation impossible. Option C is wrong because boiling generally denatures and destroys enzyme activity rather than improving it. Option D is wrong because sunlight is not the required energy or reaction condition for DNA ligation and may damage biological materials. Blunt-end ligation is possible, just less convenient than sticky-end ligation. Memory cue: sticky ends hold themselves; blunt ends need better conditions and ligase.

Related tags

Blunt End LigationLigase ConditionsDna Ends

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