The makeup of their cell walls. In general, archaebacteria resemble bacteria in terms of size, shape, nutrition, and appearance. They reproduce by binary fission.
However, peptidoglycan is not found in the cell walls of archaebacteria. In addition, they vary from bacteria and eukarya in terms of the membrane lipid bonds that they have. Bacterial membrane lipids are ester-linked, whereas archaea membrane lipids have ether linkages
Eubacteria are N-acetylmuramic genuine bacteria that exhibit greater levels of organization. Archaebacteria are referred to as "living fossils" and are capable of surviving in hostile settings (very acidic, hot, and methanogenic).
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