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Why is it useful to check the selectable marker in a vector map before restriction digestion?

Answer and explanation

Correct answer: To avoid damaging the selectable marker

A selectable marker is a gene that allows cells carrying the vector to be identified or selected, commonly through resistance to a particular selection condition. Before restriction digestion, the vector map should be examined to determine whether the chosen enzyme has a recognition site inside that marker. If the marker is cut and disrupted, transformed cells may no longer show the expected selectable phenotype, making it difficult or impossible to identify recombinant colonies using that selection. The enzyme is not being coloured, gel is not made sweet, and DNA is not converted into RNA by this check. Hence option A is correct.

Related tags

Selectable MarkerVector MapRestriction DigestionCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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