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Bio notes April 10 - one can get a little bit of energy if...

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Bio notes April 10, 2008 “Bacteria in the Area” Kingdom Monera (all prokaryotic) – (mon sounds like mono which is one, the first kingdom.) i.e. No membrane-bound organelles. no mitochondria, no chloroplast, etc. Resemble the theoretical first life forms on the planet, but have become internally complex. Otherwise, 3.5 billion years with little change. Some are anaerobic. Reproduce by binary fission (asexual). The 2000+ species are classified by: 1. shape 2. gram stain (test for wall thickness) 3. colony characteristics 4. physiology Heterocyst: blue green alga does its nitrogen fixing in a heterocyst, which simply means “different cell.” 500 –paleozoic—plants colonize land Close to 500 –originof multicellular organisms (oldest animal fossils) 1500—oldest eukaryotic fossils 2500—accumulation of atmospheric oxygen from photosynthetic cyanobacteria 3500 –oldest prokaryotic fossils Photoautotrophs: need only sunlight and maybe some minerals
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Unformatted text preview: one can get a little bit of energy if one mixes hydrogen and CO2 –colony of methanogenic cells combines hydrogen and CO2 to make methane, making methanogenic cells chemoautotrophic. Heterotrophs: get energy from other living things Bacteria Cell shapes Spiral = spiralla • many species are free-living in soil • one sp. Treponeme pallidum causes Syphilus Rod = Bacilla • Many are free-living in soil • One sp. Escherichia coli lives in guts . Round or Ball = Cocci • Diplococcus: pneumonia, gonorrhea • Streptococci: strepthroat • Sarcinee—free-living in open water When bacteria divide, the cell wall pinches into two and the ring of DNA present in the one bacteria is duplicated and pinched in two (one ring for each cell). EUKARYOTES the complicated cell can do so much more than the single cell (bacteria, etc.)....
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Bio notes April 10 - one can get a little bit of energy if...

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