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What is the role of DNA ligase in making a recombinant vector?

Answer and explanation

Correct answer: Joining the insert and vector

DNA ligase is the enzyme that seals breaks in the sugar-phosphate backbone of DNA. During recombinant-vector construction, the vector and the desired insert are first cut to produce compatible ends, often sticky ends. Base pairing can hold these ends together temporarily, but ligase forms the covalent phosphodiester bonds that permanently join the fragments and produce a continuous recombinant DNA molecule. Option B is correct. Restriction enzymes perform the cutting step; ligase does not randomly cut DNA. Colouring a host and converting a vector into fat are unrelated biological actions and cannot create a recombinant molecule.

Related tags

Dna LigaseVector Insert JoiningRecombinant VectorBioprocess EngineeringPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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