MeSH definition : One of the three domains of life (the others being BACTERIA and Eukarya), formerly
called Archaebacteria under the taxon Bacteria, but now considered separate and distinct.
They are characterized by: (1) the presence of characteristic tRNAs and ribosomal
RNAs; (2) the absence of peptidoglycan cell walls; (3) the presence of ether-linked
lipids built from branched-chain subunits; and (4) their occurrence in unusual habitats.
While archaea resemble bacteria in morphology and genomic organization, they resemble
eukarya in their method of genomic replication. The domain contains at least four
kingdoms: CRENARCHAEOTA; EURYARCHAEOTA; NANOARCHAEOTA; and KORARCHAEOTA.;
One of the three domains of life (the others being BACTERIA and Eukarya), formerly
called Archaebacteria under the taxon Bacteria, but now considered separate and distinct.
They are characterized by: (1) the presence of characteristic tRNAs and ribosomal
RNAs; (2) the absence of peptidoglycan cell walls; (3) the presence of ether-linked
lipids built from branched-chain subunits; and (4) their occurrence in unusual habitats.
While archaea resemble bacteria in morphology and genomic organization, they resemble
eukarya in their method of genomic replication. The domain contains at least four
kingdoms: CRENARCHAEOTA; EURYARCHAEOTA; NANOARCHAEOTA; and KORARCHAEOTA.