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Which enzyme helps join insert DNA into a vector?

Answer and explanation

Correct answer: DNA ligase

During recombinant-DNA construction, the vector and insert are first prepared so that their ends can align, often by using the same restriction enzyme or compatible ends. DNA ligase then catalyses phosphodiester-bond formation between the aligned ends, creating a stable recombinant vector that carries the insert. Thus option A is correct. Pepsin is a protein-digesting enzyme active mainly in the stomach, and lipase breaks down fats; neither acts on DNA ligation. Chlorophyllase is associated with pigment metabolism in plants and has no role in joining a DNA insert to a cloning vector. The key sequence is cut, align, and ligate.

Related tags

Dna LigaseInsertCloning VectorCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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