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Sticky ends help in what?

Answer and explanation

Correct answer: Joining complementary DNA fragments

Direct answer: Option A, joining complementary DNA fragments. A restriction enzyme may leave short single-stranded overhanging ends called sticky ends. The exposed bases can temporarily pair with matching bases on another DNA fragment. This pairing brings the fragments close and in the correct alignment. DNA ligase then seals the sugar-phosphate backbone to make a stable recombinant DNA molecule. Option A is correct because complementary sticky ends assist joining, although ligase performs the final sealing. Option B, photosynthesis, uses light, pigments, carbon dioxide, and water; sticky ends are not involved. Option C, blood clotting, depends on platelets and clotting proteins, not DNA ends. Option D, starch digestion, is performed by amylase and related enzymes, not sticky ends. Common mistake: sticky ends help alignment and pairing; they are not themselves DNA ligase.

Related tags

Sticky EndsDna JoiningLigase

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