BIOL 123 Lecture Notes - Lecture 11: Isoprene, Archaea, Eukaryote
Document Summary
Simple cell structure- no membrane bound organelles. Histone proteins are associated with dna of both. Share over 30 ribosomal proteins that are not present in bacteria. Archaea have distinctive membrane lipids formed with ether bonds unlike the ester bonds of eukaryotes and bacteria. Ether bonds are resistant to damage by heat or other extreme conditions which helps explain why archaea are able to grow in extremely harsh environments. They use isoprene chains instead of fatty acid chains in making membranes. Extremophiles organisms that occur primarily in extreme habitats. Hyperextremophiles- so adapted to its extreme habitats it cannot grow is less extreme habitats. The domain archaea includes five phyla: k. i. n. e. c. t. Korarchaeota early diverging kora are primarily known from dna sequences found in samples from hot springs. Nanoarchaeota includes the hyperthermophile nanoarchaeum equitans, which appears to be a parasite of the thermal vent crenarchaeota ignicoccus. Thaumarchaeota thaum species that oxidize ammonia are important in global nitrogen cycling.
