Physiology of Extremely Halophilic Archaea All are chemoorganotrophs Most are obligate aerobes All require large amount of sodium for growth All stain gram negatively, binary fission growth Most are nonmotile Halobacterium and Halococcus contain large plasmids Peptidoglycan replaced by glycoportein in the cell wall Cellular components exposed to the external environment require high Nat for stability Cellular internal components require high K-t for stability Nat stabilize the cell wallsPhysiology of Extremely Halophilic Archaea All are chemoorganotrophs Most are obligate aerobes All require large amount of sodium for growth All stain gram negatively, binary fission growth Most are nonmotile Halobacterium and Halococcus contain large plasmids Peptidoglycan replaced by glycoportein in the cell wall Cellular components exposed to the external environment require high Na+ for stability Cellular internal components require high K+ for stability Na+ stabilize the cell walls