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When is a high copy number useful in a cloning vector?

Answer and explanation

Correct answer: When more plasmid DNA is needed

A high-copy-number plasmid is maintained in many copies per host cell, provided that the vector and host system support such maintenance. This feature is useful when the experiment requires a larger yield of plasmid DNA, for example for restriction analysis, sequencing, further cloning, or preparation of a DNA sample. Therefore option A is correct. High copy number does not mean that DNA is removed, that cells are destroyed, or that proteins are digested. The governing trade-off is that increasing copy number can improve DNA yield but may also place a metabolic burden on the host or reduce stability for some inserts. Thus copy number is selected according to the purpose of the cloning experiment.

Related tags

High Copy NumberPlasmid DnaYieldCloning VectorCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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