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Why are two different restriction enzymes useful in directional cloning?

Answer and explanation

Correct answer: To control the orientation of the inserted DNA

The governing concept is directional cloning through non-identical DNA ends. When two different restriction enzymes cut the vector and insert at selected sites, the two ends are usually non-compatible with one another. The insert can therefore pair with the vector only in the intended arrangement, rather than entering in either forward or reverse orientation. This greatly reduces incorrectly oriented clones and may also prevent vector self-ligation. Option C is correct because the different ends impose orientation control. Option A is wrong because the DNA is preserved, not destroyed; option B is unrelated to restriction digestion; and option D concerns fermentation, not molecular cloning.

Related tags

Directional CloningRestriction EnzymesInsert OrientationCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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