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What is one useful feature of a circular plasmid?

Answer and explanation

Correct answer: It can replicate independently in a cell

The governing concept is the usefulness of plasmids as cloning vectors. Many bacterial plasmids possess their own origin of replication, allowing them to be copied separately from the host chromosome. This independent replication can increase the number of copies of an inserted gene and makes recovery or expression of that gene easier. Consequently, option A is correct, although the exact copy number depends on the particular plasmid and host conditions. Option B is false because a plasmid is itself DNA and can carry an inserted DNA fragment. Option C is false because plasmids are especially common in bacteria, not only humans, and option D is false because a plasmid does not invariably kill its host cell.

Related tags

Circular PlasmidIndependent ReplicationCloning VectorCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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