False. While it is true that peptidoglycan is primarily found in the cell walls of prokaryotic cells, specifically bacteria, it is not exclusive to them. Some archaea, which are also prokaryotic organisms, have similar components in their cell walls but do not contain peptidoglycan. Instead, they may have other polysaccharides or proteins that serve a similar purpose. Additionally, peptidoglycan is not present in eukaryotic cells, which have different structural components in their cell walls. In summary, peptidoglycan is a defining feature of bacterial cell walls, but not an exclusive characteristic of all prokaryotic cells.
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