Archaeobacteria differ from eubacteria in a number of other ways. For example, their cell walls never contain peptidoglycan, they often live in extreme environments, and they carry out unusual metabolic processes. The ArchaebacteriaArchaeobacteria differ from eubacteria in a number of other ways. For example, their cell walls never contain peptidoglycan, they often live in extreme environments, and they carry out unusual metabolic processes. The Archaebacteria