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When can a low-copy plasmid be better in a competent host?

Answer and explanation

Correct answer: For a toxic or unstable insert

Plasmid copy number determines, in part, how many plasmid molecules and how much plasmid-encoded product a host must maintain or express. The governing concept is host burden. A low-copy plasmid can reduce metabolic demand and lessen toxicity caused by a harmful gene product, while also reducing instability or selection for deletions in some constructs. Therefore option A is correct when the insert is toxic, burdensome or unstable. It is not automatically superior for every simple plasmid; copy number does not stop DNA uptake and does not remove the need for selection. The trade-off is that low-copy constructs may provide less DNA and weaker signal, so the vector must suit the experimental goal.

Related tags

Low-Copy PlasmidToxic InsertHost BurdenCompetent HostPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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