How does the cell wall aid in classifying bacteria?
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When it comes to bateria, there are two basic forms of cell walls: gram-positive and gram-negative. Gram positive cells have a thick peptidoglycan layer. This thick layer retains the crystal violet stain (purple color) when stained. Gram negative organisms have a thin peptidoglycan layer and an overlying outer membrane. These stain pinkish due to the counter-stain used in the Gram staining procedure. It basically comes down to the composition of the cell wall. (there are also some bacteria with no cell wall structure but that's another topic.3
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