Which of the following antibiotic acts by inhibition of cytoplasmic membrane function?: (A) Penicillin, (B) Polymycin, (C) Streptomycin, (D) Novobiocin
Answer is B. Polymyxin bacitracin acts by inhibiting cell membrane or plasma membrane Not cell wall Penicillin -cell wall,streptomycin-protein synthesis inhibition Ref: CP Baveja 4th ed Pg:625