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In which condition will joining a foreign gene with a vector be easier?

Answer and explanation

Correct answer: When both have compatible ends

The governing concept is compatibility of DNA ends during recombinant-DNA construction. When the foreign gene and vector are cut to produce complementary sticky ends, the exposed bases can hydrogen-bond with one another and temporarily hold the two DNA molecules in the correct alignment. This increases the efficiency of subsequent sealing by DNA ligase, which forms permanent phosphodiester bonds in the backbone. Therefore option B is correct. Incompatible ends cannot pair efficiently, burning destroys DNA, and absence of ligase prevents stable covalent joining even when temporary base pairing occurs. Compatible ends therefore make insertion easier, though ligase is still required for permanent joining.

Related tags

Compatible EndsForeign GeneVector LigationRestriction EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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