ULTRASTRUCTURE OF BACTERIA Ultrastructure of Bacteria Cell wal · Cell wall acts as a backbone of cell and gives shape and rigidity to the cell. · Gram positive bacteria composed of Peptidoglycan (Thick – Multilayered) and Teichoic acid. · Gram negative bacteria composed of Peptidoglycan (Thin – Single layered), Periplasmic space, Outer membrane, Lipopolysaccharides, Lipid and Lipoprotein. · Peptidoglycan is a sugar backbone with peptide side chains that are cross linked. It is made up of NAM (N – acetyl muramic acid) and NAG (N – acetyl glucosamine). · One of the most abundant polypeptide called porin is present and it helps in the diffusion of solutes. · Bacterial cell wall confers Osmotic protection from toxic substances and Gram ...