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How can empty vector and recombinant vector be distinguished in a competent host?

Answer and explanation

Correct answer: By blue-white screening based on lacZ insertional inactivation

In a lacZ-based vector, insertion of foreign DNA disrupts the lacZ gene. On a medium containing X-gal, colonies carrying a recombinant vector are usually white, whereas colonies with an empty vector are blue. Antibiotic selection can allow cells carrying either vector to grow, so it does not confirm the presence of an insert. Exam tip: selection identifies transformed cells, while screening distinguishes recombinant cells.

Related tags

Competent HostRecombinant VectorEmpty VectorBlue-White ScreeningInsertional InactivationLaczPrinciples Of BiotechnologyBiotechnology

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