Archaebacteria differ from eubacteria in
(1) cell membrane structure
(2) mode of nutrition
(3) cell shape
(4) mode of reproduction
(1) Archeabacteria different from eubacteria in that eubacteria have cell membrane composed mainly of glycerol-ester lipids, while archaebacteria have membrane made up of glycerol-ether lipid. Ether lipids are chemically more resistant then ester lipids. This stability help archaebacteria survive at high temperture and in very acidic or alkaline environment.