View interactive pdb file of phospholipid . Phospholipids assemble into a lipid bilayer . But hopanoids present, probably stabilize membranes. The latter molecule produces lipid monolayers instead of bilayers . View physiology of Archaea .
Membrane proteins contribute stability and many functions, such as transport.
Length is about 1000x longer than cell. Total size for smallest bacteria less then 1,000,000 base pairs. Instead, DNA division occurs, two copies separated to opposite ends of cell, cell pinches off into two copies. Impermeable to liquids, but permeable to gas.