AP BIOLOGY

Detailed explanation-1: -Plasmids are cloning vectors that are maintained in cells as autonomously replicating circular double-stranded DNA molecules. A great many cloning vectors that are in use today were derived from naturally occurring plasmids.

Detailed explanation-2: -In general, cloning vectors are plasmids that are used primarily to propagate DNA. They replicate in E. coli to high copy numbers and contain a multiple cloning site (also called a polylinker) with restriction sites used for inserting a DNA fragment.

Detailed explanation-3: -Cloning vector-a DNA molecule that carries foreign DNA into a host cell, replicates inside a bacterial (or yeast) cell and produces many copies of itself and the foreign DNA.