Which domain of single-celled prokaryotes is characterized by cell walls that typically contain peptidoglycan?

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Bacteria

Bacteria are unique among life forms because their cell walls are reinforced with peptidoglycan, a complex mesh of sugars and amino acids. This structural feature provides the rigidity necessary for survival and is the primary target for many common antibiotics like penicillin. While Archaea are also single-celled prokaryotes, they lack this specific compound, making peptidoglycan a key identifying feature of the bacterial domain.

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The presence of peptidoglycan in the cell wall is a defining characteristic of which domain of life?

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