Question

pBR $322$ which is frequently used as a vector for cloning gene in E.coli is?

• A. An original bacterial plasmid
• B. A modified bacterial plasmid
• C. A viral genome
• D. A transposon

Answer 1

The correct option is B A modified bacterial plasmid

B. A modified bacterial plasmid

Solution : pBR-322 was the first artificial plasmid to be constructed and thus it is a modified bacterial plasmid derived from E.coli plasmid Col EI.

So the correct answer is " A modified bacterial plasmid"