Rizzo Lect 9a

Rizzo Lect 9a - Key topics so far Importance of rRNA in...

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Key topics so far Importance of rRNA in microbe phylogeny The three domains and their differences Key characters of prokaryotes Prokaryotes reproduction and lateral gene transfer
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http://evolution.berkeley.edu/evosite/evo101/IIAFamilytree.shtml
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Bacteria Archaea Nucleus No No Membrane-bound organelles No No Plasmids Yes Yes Peptidoglycan cell wall Yes No Membrane lipids Ester-linked Ether-linked Some are methanogens No Yes Some conduct chlorophyll-based photosynthesis Yes No Some fix nitrogen Yes Yes
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Diversity of Bacteria and Archaea Despite commonalities among “prokaryotes” there is enormous diversity, of many kinds, within these groups. ± Diversity of form ± Functional diversity ± Phylogenetic diversity
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Diversity of bacteria and Archaea Key to understand for diversity of form is the “big picture” regarding the existence of this diversity You do not need to memorize the names of all the organisms presented But you should be able to give examples, if asked, of aspects of this diversity
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Diversity of form: shape
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QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. Thiomargarita- giant sulfur bacteria
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Nostoc Streptomyces “filamentous” bacteria
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Diversity of form: cell walls
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Gram stain
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Understanding cell wall composition and structure of bacteria is critical for understanding: 1. how bacteria complete binary fission 2. how bacteria move through their environment 3. the mode of action of antibiotics 4. how bacteria survive high temperatures
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Penicillin binds to the enzyme that links the peptidoglycan molecules in bacteria and weakens the
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Rizzo Lect 9a - Key topics so far Importance of rRNA in...

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