This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Bacterial cell wall is composed of all except? \nSelect and explain. \nA. Muramic acid, B. Teichoic acid, C. Glucosamine, D. Mucopeptide', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Teichoic acid . Chemically,cell wall is composed of mucopeptide (peptidoglycan or murein ) scaffolding formed by N acetyl glucosamine and N acetyl muramic acid molecules alternating in chains, which are cross linked by peptide chains. Note- option 'b' is also paially correct as teichoic acid is present in the cell wall of gram positive bacteria but not in gram negative bacteria.", 'role': 'assistant'}]