Question

The first plasmid used as cloning vector was:

Answer 1

Plasmids are autonomously replicating circular extra-chromosomal DNA. They are the standard cloning vectors and the ones most commonly used. Most general plasmids may be used to clone DNA insert of up to 15 kb in size. One of the earliest commonly used cloning vectors is the pBR322 plasmid.

Answer 2

it was PBR 322 which was used first time