Cell wall is present under the capsule and above the cell membrane. It is multilayered and 10 to 100nm in thickness. The composition of cell wall of bacteria is different from that of plants and fungi. The cell wall of plants is composed of cellulose and the cell wall of fungi is composed of chitin but the cell wall of bacteria is composed of complex polymeric compound called peptidoglycan or mucopeptide or mucocomplex.
Peptidoglycan has two main groups called carbohydrate ( amino sugar) and aminoacid .The carbohydrate is peptidoglycans are N-avcetylglucosamine. The amino acids are L-alanine, D-alanine D-glutamic acid and either diaminopimelic acid (DAP) or the structurally related lysine.
The function of cell wall is to provide rigidity and shape to the bacterial cell. Any way the composition of the cell wall of Gram negative and Gram Positive bacteria are different
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