Bacterial cell wall

• Bacterial cell wall : The cell walls of all bacteria are not identical, in fact cell wall composition is one of the most important criteria to identify bacterial species and classify them. Bacteria are broadly classified as gram negative and gram positive bacteria.
• The cell wall of Gram positive bacteria consists many layers of a polysaccharide peptidoglycan, cross linked by amino acids. 90% of gram positive bacterial cell wall is composed of peptidoglycan, whereas only 20% of gram negative bacterial cell wall is made of peptidoglycan. So, gram positive bacteria have a very thick cell wall but gram negative have a thinner wll. Example of gram positive bacteria include bacillus and clostridium. Gram negative bacteria include E.Coli and Salmonella