[Archaebacteria and evolution of life: recent progress in the research].
1994
A Yamagishi
Department of Life Science, Tokyo Institute of Technology, Yokohama.
UI
MeSH Term
Description
Entries
D005075
Biological Evolution
The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.
Evolution, Biological
D001105
Archaea
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.