Bacterial cell wall is composed of all except?
Muramic acid
Teichoic acid
Glucosamine
Mucopeptide
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.