Archaea_ Bacteria_ Eukarya

Archaea_ Bacteria_ Eukarya - Domains Domain is the highest...

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Domains Domain is the highest category in biological classification. Three domains: PROKARYOTES Archaea (ancient extremophiles) Bacteria (eubacteria) EUKARYOTES Eukarya
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8 Kingdoms Classification System Archaebacteria - prokaryotes, unicellular (mostly), tend to be extremophiles Eubacteria - prokaryotes, unicellular (mostly) Archaezoa - unicellular eukaryotes, no mitochondria, peroxisomes or Golgi apparatus Protista - simple, mostly unicellular eukaryotes, no tissues Chromista - unicellular eukaryotes, brown algae, diatoms Plantae - multicellular eukaryotes, cell walls, tissues, autotrophs Fungi - mostly unicellular eukaryotes, chitin in cell wall, heterotrophs Animalia - multicellular eukaryotes, tissues, no cell walls, heterotrophs
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Domain Archaea vs. Bacteria
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Prokaryotes (Archaea and Bacteria) earliest organisms on Earth cells smaller than eukaryotes dominate our biosphere today collective biomass 10x that of eukaryotes ubiquitous ESSENTIAL to ecosystem decomposers recycle chemical elements humans: live in us, on us, around us human body contains about 100 trillion cells and 90 trillion of these are bacteria!
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Prokaryotes (Archaea and Bacteria) No membrane bound nuclei or organelles unicellular (mostly) biofilms; colonial arrangements with specialized cell types reproduce by binary fission (asexual) exchange genetic info via conjugation Some exhibit motility simple flagella
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Domain Archaebacteria
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Archaebacteria commonly considered prokaryotes (no nucleus) different from other prokaryotes (bacteria) assigned own Kingdom and Domain have both eukaryote- and bacteria-like features contain distinct “archael rRNA” fossil evidence dates back as far as 3.5 billion years Some major types Methanogens Halophiles Thermophiles
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Archaebacteria classically called “extremophiles” found in hot springs, volcanoes, salt lakes, extreme cold, acidic pH also contains “mesophiles” found in soil, oceans, marshes inhabit environments consistent with “early Earth” may contribute up to 20% of biomass on Earth today 40% microbe biomass in ocean likely archaebacteria important part of many ecosystems
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Archaebacteria- Methanogens anaerobic; poisoned by oxygen get energy by converting carbon dioxide + hydrogen gas to methane common in wetlands; source of “marsh gas” used in sewage treatment produce enough methane- 2 billion tons per year- to play role in greenhouse effect 30% of that methane is produced in cows’ stomachs!
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salt-loving live in Great Salt Lake, Dead Sea can thrive in salt solutions as high as 36% salt! that’s 5x saltier than the ocean
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This note was uploaded on 06/05/2011 for the course BIO 1201 taught by Professor N.haque during the Spring '09 term at CUNY City Tech.

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Archaea_ Bacteria_ Eukarya - Domains Domain is the highest...

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