The major part of cell wall of monerans (Bacteria and Cyanobacteria) is made up of a polymer called

Peptidoglycan or murein is a polymer consisting of sugars and aminoacids that forms a mesh – like layer outside the  membrane of most bacteria, forming the cell wall the sugar component consists of alternating residues of  – (1, 4) linked N – acetylglucosamine (NAG) and N – acetylmeamic aciid (NAM).