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What must be done before inserting a desired gene into a cloning vector?

Answer and explanation

Correct answer: Cutting the vector with a suitable restriction enzyme

The governing concept is preparation of a cloning vector for recombinant-DNA construction. Before a desired gene can be inserted, the circular vector must be opened at a suitable recognition site. A selected restriction enzyme cuts the vector DNA and creates compatible ends, such as sticky ends, that can pair with matching ends on the desired DNA fragment. This makes option A correct. After alignment, DNA ligase is normally used to seal the sugar-phosphate backbone and form recombinant DNA. Boiling would damage or destroy the vector, changing it into sugar is biologically meaningless, and converting it into a ribosome is unrelated to gene cloning. Cutting is therefore the necessary preceding step, not the final joining step.

Related tags

Cloning-VectorGene-InsertionRestriction-EnzymesRecombinant-DnaCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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