The cell walls of all bacteria contain

Bacterial cell walls are made of peptidoglycan (also called murein), which is made from polysaccharide chains cross-linked by unusual peptides containing D-amino acids. ... Gram-positive bacteria possess a thick cell wall containing many layers of peptidoglycan and teichoic acids.

peptidoglycan

Explanation:

Bacterial cell walls are made of peptidoglycan (also called murein), which is made from polysaccharide chains cross-linked by unusual peptides containing D-amino acids. Bacterial cell walls are different from the cell walls of plants and fungi which are made of cellulose and chitin, respectively.

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