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Why is annealing possible in sticky-end cloning?

Answer and explanation

Correct answer: Base pairing between complementary single-stranded overhangs

Sticky ends have short single-stranded overhangs. If the overhangs of the vector and insert are complementary, their bases form hydrogen bonds, allowing the fragments to anneal temporarily. DNA ligase later makes the joining permanent by forming phosphodiester bonds in the sugar-phosphate backbone; it is not the initial reason for annealing. Exam tip: associate annealing with complementary base pairing and ligation with phosphodiester-bond formation.

Related tags

Sticky EndsAnnealingComplementary Base PairingDna LigaseRecombinant Dna TechnologyCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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