Question

pBR which is frequently used as a vector for cloning gene in E. coli is a/an:

• A. Original bacterial plasmid
• B. Modified bacterial plasmid
• C. Viral genome
• D. Transposon

Hint:

Modified plasmids like pBR322 are widely used as cloning vectors due to features such as selectable markers and multiple cloning sites.

Answer 1

The Correct Option is B

pBR is a plasmid vector that has been genetically engineered for use in molecular cloning, particularly in E. coli. It is not an original bacterial plasmid but a modified version that includes antibiotic resistance genes and origin of replication to facilitate the insertion and replication of foreign DNA in host cells.