BIL 160 Lecture Notes - Lecture 9: Gram Staining, Monera, Spirochaete
28 Apr 2016
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Domain archaea: domain bacteria (true bacteria_ Formerly prokaryotes were in kingdom monera: monera had archaea and bacteria. Phylogenetic tree: doesn"t show who is most primitive, just shows that they are believed to branch off first. Earliest fossils: 3. 5 billion years ago, look more like archaens. Extremophiles (archaens: can withstand extreme environments, methanogens: methane- generating (bacteria that live in cows, thermophiles: living in extremely hot environment (hydrothermal vents), most recent with eukaryotes. *read link: halophiles: living in extremely salty environments. Domain bacteria: cyanobacteria (free living photosynthetic) Basic structure and function: unicellular, aggregate or colonial, more derived species with division of labor among cells, may be categorized (not classified) based on shape. Link-forming (strept= bent: don"t reflect evolutionary relation. Closely related (spirillium and vibrio: size from 1-5 micrometers, much smaller than eukaryotes. No nucleus, no membrane organelles, rrna and proteins, cell wall (in book, look at different between flagella: circular chromosome of dna, organized in nucleoid region (unzip and duplicated)
