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Why is a self-ligated vector a problem in a competent host?

Answer and explanation

Correct answer: It can be selected because of its selectable marker, but it lacks the desired insert

A self-ligated vector is a vector that has rejoined itself without the insert DNA. Its origin of replication and selectable marker may remain functional, so host cells receiving it can grow on the selection medium. Such colonies are false positives because they do not contain the desired recombinant DNA. Option B is incorrect because a self-ligated vector lacks the insert. Exam tip: antibiotic selection alone cannot distinguish recombinant vectors from self-ligated vectors; insert screening is also needed.

Related tags

Self-Ligated VectorCompetent HostRecombinant DnaFalse PositivesSelectable MarkerInsert ScreeningPrinciples Of BiotechnologyBiotechnology

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