Which of the following is NOT a characteristic of a plasmid

Which of the following is NOT a characteristic of a plasmid used as a cloning vector?

A. contains a selection marker.

B. contains an origin of replication.

C. has a site for inserting foreign DNA.

D. integrates into the host chromosome.

E. has lacZ gene at the insertion site

Solution

D. integrates into the host chromosome.

a vector is a DNA molecule that is used as a vehivle for the introduction of foreign genetic material in the cell.Most commonly used vectors are plasmids,cosnids,viral vectors.Some features that are common to all vectors are origin of replication,multicloning site and a selectable marker system.A vector replicates autonomously irrespective of the replication of host DNA.A vector does not integrate into the host chromosome.