Practice question

Mendosicutes was historically proposed term for organisms with defective or faulty cell walls lacking muramic acid-based peptidoglycan, encompassing what are now recognized as Archaea. These prokaryotes possess ether-linked isoprenoid lipids, pseudomurein or proteinaceous S-layers, and distinctive 16S rRNA signatures diverging from eubacteria. Physiologically they include methanogens, extreme halophiles, and thermoacidophiles. Modern phylogeny reclassified Mendosicutes into domain Archaea, sharing prokaryotic organization but transcription and translation machinery closer to Eukarya, explaining similarity cited in early classification schemes focused specifically on wall chemistry evolution.