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If sticky ends are not complementary what will happen to ligase reaction?

Answer and explanation

Correct answer: Joining will be difficult

The direct answer is option A: joining will be difficult. Sticky ends are short single-stranded DNA overhangs produced by certain restriction enzymes. They join efficiently when the bases on one end are complementary to the bases on the other end, because complementary bases can hydrogen-bond and hold the fragments together temporarily. DNA ligase can then seal the backbone. If the sticky ends are not complementary, they cannot pair properly, so the fragments are poorly aligned and ligation efficiency decreases. Option A is correct. Option B is wrong because non-complementarity does not make joining always faster; it normally makes it less efficient. Option C is wrong because DNA does not automatically become protein; gene expression requires transcription and translation. Option D is wrong because ligase joins DNA and does not cut it; cutting is done by nucleases. Memory cue: matching sticky ends help ligase; mismatching ends hinder it.

Related tags

Non Complementary EndsSticky EndsLigation

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