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Why are pUC vectors useful due to high copy number?

Answer and explanation

Correct answer: More plasmid DNA can be obtained

The governing concept is plasmid copy number, which describes how many copies of a plasmid are maintained in each host cell. pUC vectors generally have a high-copy-number origin of replication, so one bacterial cell can contain many copies of the vector rather than only one or a few. When a culture of such cells is grown and the plasmid is isolated, the total yield of vector DNA is usually higher, provided the insert and host remain stable. Thus option A is correct: high copy number can provide more plasmid DNA for analysis, restriction digestion, sequencing, or further cloning. It does not mean that the host loses all DNA, digests protein, or freezes water.

Related tags

Puc VectorCopy NumberPlasmid DnaCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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