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Why can an orientation issue occur in a vector cut with the same enzyme?

Answer and explanation

Correct answer: The insert can ligate in both directions

The governing concept is end compatibility. When the vector and insert are cut with the same restriction enzyme, their corresponding ends are usually identical and compatible on both sides. The insert can therefore attach with either end facing either vector end, producing two possible orientations. If the gene has directional promoter, coding, or termination requirements, the reverse orientation may be nonfunctional even though ligation has occurred. Option A is correct. The insert is DNA, the vector necessarily has cut ends after digestion, and a restriction enzyme is not the same as DNA ligase. Directional cloning with two different restriction enzymes can reduce this ambiguity, but the final construct should still be confirmed by diagnostic digestion, PCR, or sequencing.

Related tags

Same Restriction EnzymeOrientationLigationProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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