Archaea
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(Redirected from Archaebacteria) ...
Archaea, Bacteria and Eucarya
Archaea are similar to other prokaryotes in most aspects of cell structure and metabolism.
Economic Importance of the Archaea
Because they have enzymes that can function at high temperatures, considerable effort is being made to exploit the archaea for commercial processes such as providing ...
Archaeal Proteomics
Carol Giometti (Argonne National Laboratory) described the Archaeal Proteomics Project, whose goal is to identify proteins and regulatory pathways relevant to bioremediation and energy technology.
Archaea: A prokaryote kingdom that has not diverged much from the ancestral prokaryote stock. Contemporary species of Archeabacteria live in extreme conditions. The three major groups are halobacteria, sulphobacteria and methanogens.
Archaea Proposed, but not widely accepted, sixth taxonomic kingdom that would include the archaebacteria.
Archaea
One of two prokaryotic domains, the other being the Bacteria.
archegonium pl. archegonia ...
Are archaea more closely related to eukaryotes or bacteria?
Archaea are probably more closely related to us than we are to bacteria.
The Archaea are becoming more understood
The methanogenic archaeon, Metanococcus jannaschii:
is found 3 km down, at 85 deg C ...
Archaea and Eubacteria are similar in size and shape. When we do recover "bacteria" as fossils those are the two features we will usually see: size and shape.
archaea (archebacteria) Early prokaryotes, differing from bacteria in having unusual types of metabolism, membrane lipids, and amino acid and DNA and RNA base sequences. Inhabit extreme environments.
In archaea, the cell wall is characteristically lacking the peptidoglycan (except for a group of methanogens) and is composed of glycoprotein S-layers, pseudopeptidoglycan, or polysaccharides.
The archaeal basal transcriptional machinery consists of TBP (TATA-binding protein), TFB (transcription factor B; a homologue of eukaryotic TFIIB) and an RNA polymerase that is structurally very similar to eukaryotic RNA polymerase II.
Many scientists now believe that the archaea and bacteria developed separately from a common ancestor nearly four billion years ago. Millions of years later, the ancestors of today's eukaryotes split off from the archaea.
The other prokaryotic domain is the Archaea. Bacteria superficially resemble Archeons in their general sizes and shapes, but are distinguished from them by different membrane structures, gene sequences, and metabolisms.
A phylogenetic tree of all living things, based on rRNA gene data, showing the separation of the three domains bacteria, archaea, and eukaryotes as described initially by Carl Woese.
The study of genes and gene function in bacteria, archaea, and other microorganisms. Often used in research in the fields of bioremediation, alternative energy, and disease prevention.
See also: model organisms, biotechnology, bioremediation ...
The diagram below shows evolutionary relationships between bacteria, archaea, and the four kingdoms of eukaryotic organisms.
Eukaryotic Cells ...
prokaryotic -- Literally "before the nucleus", the term applies to all bacteria and archaea. Prokaryotic cells have no internal membranes or cytoskeleton. Their DNA is circular, not linear.
Taken from Carl Zimmer's blog, The Loom, based on work done by Victor Kunin, et al. This image covers only bacteria and archaea, but the same conclusions apply at the wider scale of other single celled organisms. [Full-sized image] ...
 See also: Bacteria, Organ, Protein, Trans, Life
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