This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
Bacitracin acts on: 
Select and explain. 
A. Cell wall, B. Cell membrane, C. Nucleic acid, D. Ribosome
A: Cell wall
Answer: A: Cell wall 
Explanation: Ans. (A) Cell wall(Ref: Katzung 10/e p741; KDT 8/e p741)Bacitracin acts by inhibiting the synthesis of cell wall.Other polypeptide antibiotics like polymyxin B, colistin and tyrothricin act by affecting membranes.