The organism, which is used for gene transfer in higher plants is

Which of the following is a plasmid?

In gel electrophoresis,the sample $DNA$ is cut into fragments by

What is a plasmid?

Given below are two statements.
Statement $I$: Restriction enzyme $BamHI$ has its recognition site in $tet^R$ region of $pBR322$.
Statement $II$: $E. coli$ having $pBR322$ with a desired $DNA$ if inserted at $BamHI$ site can grow in medium containing tetracycline.
In the light of the above statements, choose the correct answer from the options given below.

Plasmids are found in