Final answer:
Bacteria and eukarya have phospholipid membrane bilayers, but the difference in archaea is that their backbone is ether-linked and made of isoprene chains. This is beneficial since they live in such harsh conditions.
Step-by-step explanation:
Bacteria and Eukarya have phospholipid membrane bilayers, while Archaea have membranes with ether-linked isoprene chains, which offer stability in extreme environments.
This is beneficial since they live in such harsh conditions. Archaea's unique cell membrane composition allows for greater stability in extreme environments.
Unlike the ester-linked fatty acids found in bacteria and eukaryotes, archaeal membranes often consist of ether-linked phytanyl units, which may form not only a bilayer but also a monolayer, contributing to their ability to withstand high temperatures and acidic conditions.