What is the cell wall made of?

The cell wall is not found in all species. In organisms that do have a cell wall, the composition and structure may differ depending on the type of cell as well as its developmental stage. The cell wall in plants is composed mainly of cellulose, pectin and hemicellulose. Bacterial cell walls are made of peptidoglycans. Fungal cell walls are composed of chitin polymer, N-acetylglucosamine. The cell wall in algae is composed of polysaccharides and glycoproteins such as agar and carrageenan. The cell walls of archaea are composed of pseudopeptidoglycan, S layer, or polysaccharides.