<prompt> Teichoic acid is present in the cell wall ofGram positive bacteriaGram negative bacteriaAcid fast bacteriaAll of the above  <response>: Teichoic acids, which are polymers of polyribitol-phosphate, are cross-linked to the peptidoglycan and can be antigenic. They are impoant in cell wall metabolism. Antiteichoic acid antibodies detectable by gel diffusion may be found in patients with active endocarditis caused by S aureus.ComponentsGram-PositiveGram-NegativeColor of GramStained CellPurpleReddish-pinkRepresentativeGeneraBacillus,Staphylococcus,StreptococcusEscherichia,Neisseria,PseudomonasPeptidoglycanThick layerThin layerTeichoic acidsPresentAbsentOuter membraneAbsentPresentLipopolysaccharideendotoxinAbsentPresentPorin proteinsAbsentPresent; allow passage ofmolecules through outermembranePeriplasmAbsentPresentRef: Jawetz; 27th edition; Page no: 23 