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When are sticky ends in restriction-cut DNA useful?

Answer and explanation

Correct answer: When a foreign gene is to be joined with a vector

The governing concept is cohesive-end joining during gene cloning. A restriction enzyme can make a staggered cut, leaving short single-stranded overhangs called sticky ends. If a foreign gene and a vector are cut with the same suitable enzyme, their overhangs can have complementary sequences. The ends then anneal through hydrogen bonding, bringing the insert and vector into the correct alignment; DNA ligase can subsequently seal the backbone. Therefore option A is correct. Heating water, changing leaf colour, and filtering soil are unrelated processes and do not explain the molecular usefulness of sticky ends. Sticky ends increase the efficiency and specificity of recombinant-DNA assembly.

Related tags

Sticky EndsVectorForeign GeneCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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