(i) pBR322 has two antibiotic-resistant genes for ampicillin and tetracycline, which acts as a selectable marker which is used for differentiation between the recombinants and non-recombinants. Thus, it helps in the identification and the selection of the transformants.
(ii) Ori is the origin of replication site in cloning vector pBR322, which is a genetic sequence which acts as an initiation site for replication of DNA.
(iii) ROP in pBR322 is known as the repressor of primer, which is a protein which plays the role of regulating the copy number.
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