Identify a character that is not unique to archaebacteria:
(1) Cell wall structure
(2) Cell membrane structure
(3) Flagellin protein structure
(4) Fatty acid synthetase present
(4) Cell wall lacks peptidoglycan. Cell membrane has glycerol-ether lipids. In contrast to the bacterial flagellum, which is hollow and is assembled by subunits moving up the central pore to the tip of the flagella, archaeal flagella are synthesized by adding subunits at the base. As archaea have lipids with isoprenoid hydrophobic chains, the synthesis of their membrane lipids does not depend on fatty acid synthetase.