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Unformatted text preview: proteins and replication methods. • Archaea Structure and Function – Plasma membranes of archaea contain unusual lipids that allow them to function at high temperatures. • Archaea lipids are glycerol linked to branched chain hydrocarbons • Bacterial lipids are glycerol linked to fatty acids – Most are chemoautotrophs. • few are photosynthetic. – Sometimes mutualistic or commensalistic, but none are parasitic. • Types of Archaea – Methanogens • Found in anaerobic environments. • Produce methane from hydrogen gas and carbon dioxide, produce 65% of earths methane. – Halophiles • Require high salt concentrations for growth. • Dead sea, salt lakes of Utah – Thermoacidophiles • Reduce sulfides and survive best at temperatures above 80 o C. • Hot springs, geysers, submarine vents, volcanoes •...
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