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searched word: Archaebacteria
Found 7 match(es) in the Formal Descriptions | Archaebacteria - Also referred to as Archaea, the smaller set on non-nucleated cellular life that used to be referred to as bacteria or prokaroytes. Considered one of the three major types of cellular life. They differ biochemically in the arrangement of the bases in their ribosomal RNA and in the composition of their plasma membranes and cell walls from the Eubacteria. Often regarded as extremophiles, with tendencies to methanogens, halophiles, and thermophiles. The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermophiles are the heat-loving bacteria found near hydrothermal vents and hot springs. Many thermophiles are chemosynthetic using dissolved sulfur or other elements as their energy source and iron as a means of respiration. Archaebacteria emerged at least 3.5 billion years ago and live in environments that resemble conditions existing when the earth was young. Arachae have pseudopeptidoglycan cell walls, lipids are branched chain hydrocarbons linked to glycerol molecules by ether linkages - fatty acid components are not found in archeal lipids, DNA in a single circular molecule but with extrachromosal plasmids, histone-like DNA binding proteins, complex (up to 14 subunits) RNA polymerases, high internal salt concentrations.
| Archaeoglobus - See description of Archaeoglobuis fulgidus, type species. Original description: STETTER KO. 1988. Archaeoglobus fulgidus gen. nov., sp. nov. a new taxon of extremely thermophilic Archaebacteria. Syst. Appl. Microbiol., 10, 172-173.
| Cellular Life - The nucleic acid and protein machinery is enclosed within a lipoprotein layer or membrane. There are three major types of cellular life; the Eubacteria or bacteria, the Archaebacteria or Archaea and the Eukaryotes. The Eubacteria and Archaebacteria collectively used to be referred to as Bacteria or prokaryotes. The relationships among these three domains of life are unclear.
| Eubacteria - One of the three major domains of cellular life, the others being Archaebacteria (Archaea) and Eukaryotes. The Eubacteria are also referred to as Bacteria by some, but this term has an alternative meaning (all non-eukaryotic cellular life). Peptidoglycan cell walls, lipids are straight chain fatty acids linked to glycerol molecules by ester linkages, genome typically but not always as a single loop of DNA, RNA polymerases with smallish number of subunits. The most diverse and abundant of the non-nucleated cellular life forms.
| Euryotes - Subset of Archaebacteria, includes thermophiles, hyperthermophiles, methane producing, or halophilic.
| Life - Living organisms are entities that utilise nucleic acids to encode information about proteins, and are dependent on a process that assembles proteins from an RNA template. This definition is intended to include viruses as well as three forms of cellular life - the Bacteria or Eubacteria, the Archaea or Archaebacteria, and the eukaryotes.
| Life - Life includes energy-consuming replicating entities that rely on nucleic acids to provide organizational information. Life is usually thought of as being cellular, includes prokaryotes (Archaebacteria and Eubacteria), plants, fungi, protists, and animals. Viruses are included as life forms. At this time, the hypothesis that life occurs uniquely on Earth remains unfalsified.
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| Found 1 match(es) in the Image Captions | Tree - This diagram shows the relationships between all major forms of life as inferred from comparisons of one particular molecular (the gene for the small subunit of ribosomal RNA). Insights from molecular biology inform our understanding of the evolutionary history of life on Earth. From these studies, we know that all forms of life are interrelated, that there are three major branches of life (Archaebacteria, Eubacteria, Eukaryotes) and that microbes dominate the diversity of life. Animals, plants, and fungi are closely related and have appeared on Earth relatively recently.
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