<prompt> Which of the following antibiotic acts by inhibition of cytoplasmic membrane function?PenicillinPolymycinStreptomycinNovobiocin  <response>: 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 