BIOL 2004 Study Guide - Final Guide: Methanogenesis, Phototroph, Cell Membrane
19 Apr 2016
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Document Summary
Prokaryotes, but: have some eukaryote like features, several features specific to own clade. Some archaea specific features: cell membrane and cell envelope compostion is different. Have ether bonds instead of ester bonds. Some eukaryote like features: similar transcription and translation apparatus. Promotors similar: some histone proteins in some groups, reflects a strong phylogenetic closeness between eukaryotes and archaea. Hypothermophiles: extreme high temperature loving, many are lithoautotrophs, found in association with geothermal features. Extremely stable more rigid, increased ability to stay together. Obligate anaerobes: environments with non oxygen biochemisty of organism is disrupted by oxygen. Hot springs, geothermal vents, deep in earth"s crust: sources of h2, h2s, sulfur. Many eat hydrogen, and use sulfur as an electron acceptor. H2 = inorganic source of electrons (electron donor) Methanogenesis as an energy pathway: live mostly off waste products of fermenters. Co2 acts as an electron acceptor: hydrogenatrophy. Feed off hydrogen hydrogen is oxidized using co2 as an electron acceptor.
