MICR 2420 Lecture Notes - Symbiosis, Sulfuric Acid, Haloarchaea

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Archaea are the most _________ diverse of the 3 domains archaea have been known to cause disease. How are archaea distinct from bacteria? what are the 2 main phyla of the domain. Archaea? what are the characterisitics of the phyla. What is the habitat of crenarchaeotic hyperthermophiles? ecologically. Species found in extreme to moderate temps, salinity, ph Euryarchaeota encompass the widest range of growth temps of any division of life include both hyperthermophiles and mesophiles&psychrophiles commonly grow in hot spring and geysers. High acidity (resulting from the oxidation of s and fe) Respire by oxidizing sulfur (h2s -> h2so4) hyperthermophiles, grow at 80-90deg in hot springs and volcanic vents cell membranes composed mainly of tetraethers with cyclopentane rings (common in acidophilic thermophiles b/c they are impermeable to h+) No cell wall - just an s-layer mesophiles: grow best in moderate temps psychrophiles: grow best in cold temps (-15 - +10deg) Crenarchaeotic psychrophile symbiotically inhabits the sea spong axinella mexicana.

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