- 1) Theycontain hydrocarbons derived from isoprene units: five-carbon, branchedmolecules:
Because of the kink that you see in isoprene, the lipids inarchaeal membranes = branched.
2) Hydrocarbonsare attached to glycerol by ether links rather than ester links. This allowsthem to be more resistant to chemical attacks than bacteria.
3) Archaea also have diglycerol tetraether lipids in their membranes. Diglycerol tetraether lipids are formed when two glycerol residuesare linked by two longhydrocarbonsthat are 40 carbons in length. They are more rigid than diethers. Thediglycerol tetraether lipids are found in archaea that live in hotenvironments.