Penicillin G also known as benzylpenicillin. It exert a bacteriocidal as well as a bacteriostatic effect on susceptible bacteria by interfering with the final stages of the synthesis of peptidoglycan, a substance in the bacterial cell wall. Penicillin G is a narrow spectrum antibiotic derived…

Spectinomycin is an aminocyclitol antibiotic, closely related to the aminoglycosides, it inhibits protein synthesis (elongation) by interfering with peptidyl tRNA translocation. Mutation in rpsE (the gene for ribosomal protein S5) prevents binding of spectinomycin. Specinomycin is used in cell…