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Why is screening needed even after selection?

Answer and explanation

Correct answer: Selection may only show vector uptake

The governing concept is the distinction between selection and screening in recombinant DNA work. Selection applies a condition, such as antibiotic resistance or nutritional complementation, that allows cells containing a selectable marker to survive. However, a surviving cell may contain an empty vector, an incorrectly inserted fragment, or a rearranged construct. Screening uses methods such as colony PCR, restriction analysis, blue-white screening, or hybridization to determine whether the desired insert and arrangement are present. Thus option A is correct; B confuses survival with insert confirmation, while C and D are scientifically false.

Related tags

SelectionScreeningRecombinant DnaCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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