Plant cell walls are made of cellulose, hemicellulose and pectin. Algae cell walls also contain glycoproteins, and other substances.
Fungal cell walls are made of chitin.
Bacterial cell walls are made of peptidoglycan (aka "murein").
Interestingly, archaebacteria have cell walls made of many different substances - but not peptidoglycan. They can be pseudopeptidoglycan, sulphated polysaccharides, glycoproteins, or proteins.
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