Gram-positive cell wall The Gram-positive cell wall has a peptidoglycan layer that is relatively thick(ca. 40 nm) and comprises approximately 90% of the cell wall. The cell walls of most Gram-positive eubacteria also have teichoic acids Peptidoglycan structure Teichoic acid Cell wall (peptidoglycan) C membrane Teichoic acid structureThe Gram-positive cell wall has a peptidoglycan layer that is relatively thick (ca. 40 nm) and comprises approximately 90% of the cell wall. The cell walls of most Gram-positive eubacteria also have teichoic acids. Gram-positive cell wall