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Archaebacteria

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Archaebacteria ... Archaebacteria are found in extreme environments such as hot boiling water and ... Like archaebacteria, eubacteria are complex and single celled. ...
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Archaebacteria A phylum of organisims distinct from both prokaryotes and eukaryotes.
Ascertainment The method by which individuals (and families) come to attention for genetic study.

Archaebacteria 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.

The archaebacteria and eubacteria until very recently were put in the Kingdom Monera and we will use this terminology. Some scientists have awarded kingdom status to each of the two groups: Kingdom Archaebacteria and Kingdom Eubacteria.

58: The Archaebacteria: Biochemistry and Biotechnology
Edited by MJ Danson, DW Hough and GG Lunt
57: Protein Structure, Prediction and Design
J Kay, GG Lunt and G Osguthorpe ...

Archaea (originally Archaebacteria) -- Bacteria (originally Eubacteria) -- Eukarya
These domains reflect whether the cells have nuclei or not, as well as differences in the cell exteriors.

These are: the prokaryotes ("ordinary" bacteria), archaebacteria (thermophilic, methanogenic and halophilic bacteria) and eukaryotes.

The most primitive group, the archaebacteria, are today restricted to marginal habitats such as hot springs or areas of low oxygen concentration.

Archaebacteria (← links)
Messenger rnas (← links)
Organelle (← links)
Chaperone (← links)
Chaperonin (← links)
Signatures (← links)
Signature sequence (← links)
Leader sequence (← links)
Secretory proteins (← links) ...

Even older than the bacteria are the archeans (also called archaebacteria) tiny prokaryotic organisms that live only in extreme environments: boiling water, super-salty pools, sulfur-spewing volcanic vents, acidic water, ...

ocytes A group of prokaryotes currently classified among the Archaebacteria but possibly a sister group of eukaryotes.
eosinophil White blood cells characterized by the presence of cytoplasmic granules that become stained by an acid dye.

Modern alternative classification systems generally begin with the three-domain system: Archaea (originally Archaebacteria); Bacteria (originally Eubacteria); ...

Comparing the DNA sequences of entire genomes of differerent microbes will provide new insights about relationships among the three kingdoms of life: archaebacteria, eukaryotes, and prokaryotes.
DNA Forensics (Identification) ...

He then split the former kingdom of Monera into the Eubacteria (bacteria) and the Archaea (archaebacteria) domains. Woese then placed most of the "unusual" prokarytes in the Archaea, leaving traditional bacteria in the Eubacteria.

Although they share a basic morphology with bacteria and they are also prokaryotes (i.e. they lack a nuclear membrane), in many molecular details they resemble eukaryotes more than bacteria. Previously called Archaebacteria.

when their ribosomal RNA was sequenced, it became obvious that they bore no close relationship to the bacteria and were, in fact, more closely related to the eukaryotes (including ourselves!) For a time they were referred to as archaebacteria, ...

See also: Organ, Bacteria, Environment, Life, Cells