Question

(i) Draw a schematic diagram of the cloning vector pBR322 and label:
(1) BamHI site 
(2) Gene for ampicillin resistance 
(3) Ori 
(4) Rop gene 

Hint:

pBR322 is one of the first widely used cloning vectors in genetic engineering.

Answer 1

The pBR322 plasmid is a common tool in genetic engineering, characterized by several key features:
- BamHI site: A specific location for introducing foreign DNA. 
- Ampicillin resistance gene: Allows for the identification of cells that have successfully incorporated the plasmid, by enabling their growth in ampicillin-containing media. 
- Ori (Origin of replication): Essential for the plasmid's ability to be copied within host organisms. 
- Rop gene: Controls the number of plasmid copies, ensuring stable cloning. These elements collectively render pBR322 a highly effective and adaptable vector for molecular cloning, facilitating the insertion and propagation of foreign DNA in host cells.