The figure below is the diagrammatic representation of the E.Coli vector pBR 322. Which one of the given options correctly identifies its certain components (s)?
(a) Ori-original restriction enzyme
(b) rop-reduced osmotic pressure
(c) Hind III, Eco RI -selectable markers
(d) ampR, tetR-antibiotic resistance genes
(d) Ori represents the site of origin of replication, rop represents the proteins that take part in the replication of plasmid. Hind III, Eco RI are the recognition sites of restriction endonucleases. ampR and tetR are the antibiotic resistance gene parts.