Antibiotic resistance gene was cloned by Cohen and Boyer in (a) Salmonella (b) Proteus vulgaris (c) E. coli (d) Haemophilus influenzae.
Option C.S. Cohen and H. Boyer constructed the first recombinant DNA using antibiotic resistance genes present on the plasmid of drug resistance strains of E. coli. This gene was linked to the native plasmid of Salmonella typhimurium.
