Online Google Dictionary

archaebacteria 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun (plural)
/ˌärkēˌbakˈti(ə)rēə/,
Font size:

archaebacteria, plural;
  1. Microorganisms that are similar to bacteria in size and simplicity of structure but radically different in molecular organization. They are now believed to constitute an ancient intermediate group between the bacteria and eukaryotes

  1. considered ancient life forms that evolved separately from bacteria and blue-green algae
  2. The Archaea are a group of single-celled microorganisms. A single individual or species from this domain is called an archaeon (sometimes spelled "archeon"). They have no cell nucleus or any other membrane organelles within their cells. ...
  3. Formerly a taxonomic subkingdom, within kingdom Bacteria — now reclassified as the domain Archaea — comprising organisms formerly called archaebacteria
  4. Ancient (over 3.5 billion years old) group of prokaryotes; some biologists want to place this group into a separate Kingdom, the Archaea. Most currently place it within the Kingdom Monera.
  5. an ancient line of bacteria, including the methanogenic, halophilic and thermoacidophilic groups found in hot springs and sea-floor vents; their ribosomes are distinctive, and they also differ from eubacteria (q.v.) in their ribosomal RNA, wall chemistry, and lipids.
  6. One of two major groups of prokaryotes; many species of archaebacteria live in extreme conditions similar to those prevalent on primitive Earth.
  7. the kingdom of prokaryotic cells, excluding eubacteria (considered as a separate domain in certain classification schemes), which is alleged to be ancestral to eubacteria by some evolutionists
  8. halophiles (salt), methanogens (methane-producers), thermoacidophiles (hot and acidic).
  9. Kingdom of unicellular prokaryotes that have cell walls that do not contain peptidoglycan.  This group is typical of the ancient bacteria.  They live in harsh environments like volcanic vents, hot springs, brine pools, and methane bogs.
  10. An older term for the Archaea.
  11. An alternative name for the domain archaea.