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Archaea in Biological Definition

Archaea

... Korarchaeota Phylum Nanoarchaeota The archaea are a major group of prokaryotes . Their ... of living things. He later renamed the groups archaea and Bacteria to emphasize this, and argued that ... things. Archaea, Bacteria and Eucarya archaea are similar to other prokaryotes in most aspects ...

Biology

... the separation of the three domains bacteria , archaea , and eukaryotes as described initially by ... begin with the three-domain system : archaea (originally Archaebacteria) -- Bacteria ... common descent ( UCD ) for all bacteria , archaea , and eukaryotes (see Three domain system ). ...

Prokaryote

... dividing prokaryotes into the Bacteria and archaea (originally Eubacteria and Archaebacteria) ... arrangement of Eukaryote, Bacteria, and archaea is called the three-domain system . ... are found in nearly all environments on earth. archaea in particular seem to thrive in harsh conditions, ...

Bacterium

... each of these and the eukaryotes all evolved separately and in 1990 emphasized this by promoting them to domains , which were renamed the Bacteria, archaea , and Eucarya . This redefinition has generally been accepted by molecular biologists but criticized by some others, who maintain that he ...

Genetic code

... for Cysteine. Another variant is found in some species of the yeast candida , where CUG codes for Serine. In some species of bacteria and archaea , a few non-standard amino acids are substituted for standard stop codons; UGA can code for selenocysteine and UAG can code for pyrrolysine . ...

Common descent

... code is generally regarded by biologists as definitive evidence in favor of the theory of universal common descent ( UCD ) for all bacteria , archaea , and eukaryotes (see Three domain system ). Analysis of the small differences in the genetic code has also provided support for UCD. The Tree of ...

Ion gradient

... is an interconvertible form of energy in active transport, electron potential generation, NADPH synthesis and ATP synthesis/hydrolysis. Some archaea , most notably halobacteria , make proton gradients by pumping in protons from the environment with the help of the solar driven enzyme ...

Endosymbiotic theory

... and in its size). Mitochondria utilize a different genetic code than the eukaryotic host cell; this code is very similar to bacteria and archaea . They are surrounded by two or more membranes , and the innermost of these shows differences in composition compared to the other membranes in ...

Bacterium

... each of these and the eukaryotes all evolved separately and in 1990 emphasized this by promoting them to domains , which were renamed the Bacteria, archaea , and Eucarya . This redefinition has generally been accepted by molecular biologists but criticized by some others, who maintain that he ...

Evolution

... 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 . Trees constructed with other genes are generally similar, although they may place some ...

Evolutionary tree

... Proteobacteria Spirochaete Thermodesulfobacteria Thermomicrobia Thermotogae unclassified Bacteria ... Domain archaea Crenarchaeota (extremely thermophilic archaebacteria) Euryarchaeota Korarchaeota Nanoarchaeota Domain Eukaryota , ...

Flagellum

... also: evolution of flagella . Archaeal flagellum The archaeal flagellum is another prokaryote flagellum that is found exclusively in the archaea (also known as archaeabacteria, depending on whether or not one believes that these prokaryotes constitute a fundamental domain of life (e.g., ...

Genetic code

... for Cysteine. Another variant is found in some species of the yeast candida , where CUG codes for Serine. In some species of bacteria and archaea , a few non-standard amino acids are substituted for standard stop codons; UGA can code for selenocysteine and UAG can code for pyrrolysine . ...

Genomics

... by horizontal gene transfer . This phenomenon is most prominent in thermophilic bacteria, where it seems that genes were transferred from archaea to Eubacteria . It has also been noticed that bacterial genes exist in eukaryotic nuclear genomes and that these genes generally encode ...

Halobacteria

... Natrialba Natrinema Natronobacterium Natronococcus Natronomonas Natronorubrum The halobacteria are a family of archaea , found in water saturated or nearly saturated with salt. They are also called halophiles , though this name is also used for other organisms which ...

Microbiology

... organism being studied and inserts them into yeast cells to study protein-protein interactions within a cellular environment. See also archaea Bacterium Biochemistry Eukaryote Genetics Geomicrobiology Immunology Medicine Prokaryote Virology ...

Microorganism

... The study of microorganisms is called microbiology . Microorganisms may be found almost anywhere in the taxonomic structure. Bacteria and archaea are almost always microscopic. A number of eukaryotes are also microscopic, including most protists and a number of fungi . Microorganisms ...

Origin of life

... kilometers below the surface. It is now known that microbial life is plentiful up to five kilometers below the earth's surface in the form of archaea , which are generally considered to have originated around the same time or earlier than bacteria , most of which live on the surface including the ...

Polymerase chain reaction

... (errors) in the DNA sequence, since it lacks 3'->5' proofreading exonuclease activity. Polymerases such as Pwo or Pfu, obtained from archaea , have proofreading mechanisms (mechanisms that check for errors) and can significantly reduce the number of mutations that occur in the copied ...

Proton pump

... across the membrane while drawing energy from this flow to synthesize ATP. Bacteriorhodopsin is a photosynthetic pigment used by archaea , most notably halobacteria . See also: transmembrane ATPase active transport cytochrome mitochondrion chloroplast ...
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