7 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 7...

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PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 7 Overview of the Bacteria and Archaea
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Woese’s tripartite hypothesis stirs controversy “The evidence presented by me shows clearly that the archaebacteria are so much more similar to the eubacteria than to the eukaryotes that their removal from the prokaryotes is not justified.” Ernst Mayr Two empires or three? PNAS 95:9720-9723 (1998)
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DNA not packaged DNA packaged with histones no introns genes contain introns genes are transcribed together in operons genes are transcribed separately no polyadenylation mRNAs are polyadenylated simple divison cycle, no differentiation complex life cycles - cellular differentiation unicellular multicellular anaerobic or aerobic aerobic absorbtive ingestive or photosynthetic no internal skeleton or organization cells contain a cytoskeleton reproduce by binary fission reproduce sexually or by budding no mitosis division cycle includes mitosis haploid diploid no organelles contain organelles one small circular DNA chromosome contain many large linear chromosomes no nucleus contain a nucleus small - 1 to 5 microns large - 20 to 100 microns Prokaryotes Eukaryotes http://www.mbio.ncsu.edu/MB451/lecture/evolutionaryConcepts/lecture.html Prokaryotes were defined on the basis of a few described species…mainly E. coli
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The eukaryote-prokaryote dichotomy Originally proposed by Edouard Chatton in 1937 Norman Pace; http://pacelab.colorado.edu/ 1. All eukaryotes are “of a kind,” specifically related to one another. True : Eukaryotes are a monophyletic group. 2. All prokaryotes are “of a kind,” related to one another to the exclusion of eukaryotes. False
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This note was uploaded on 08/04/2009 for the course BIOL 4125 taught by Professor Christner during the Spring '08 term at LSU.

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7 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 7...

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