Rigid solid covering present between plasma membrane and glycocalyx.
The cell wall is made up of peptidoglycan.
Peptidoglycan is a polysaccharide made of two glucose derivatives N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), alternated in long chains. The chains are cross-linked to one another by means of four amino acids i.e. L-alanine, D-glutamine, L-lysine or meso-diaminopimelic acid (DPA), and D-alanine.
On the basis of the structure of the cell wall, bacteria can be Gram positive or Gram negative
The cell wall provides structural support to the cell, maintaining the shape of the cell and it also protects the cell.
Cell wall of bacteria is not made up of polysaccharides.