Bio171-F08-lec27 - Lecture 27: Wednesday, November 5, 2008...

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Unformatted text preview: Lecture 27: Wednesday, November 5, 2008 Biology 171 Todays Topic: The Prokaryotic World Announcements This Week in Discussion: Bacterial Diversity - Your Gut Flora Exam III Monday, November 17 Text Reading Lec 27: 2 nd ed: Chapter 27 (582-604) 3 rd ed: Chapter 28 (566-590) Lec 28: 2 nd ed: Chapter 34 (780-800) 3 rd ed: Chapter 35 (769-789) Prokaryotes/Bacteria/Archaea/Eukarya Reproduction & Pathogenesis Conjugation & Antibiotic Resistance Electron Donor/Acceptor Diversity Extremophiles Life in Sediments - Redox Potential Hot Vent Symbiosis In terms of complexity, the primary distinction among living organisms separates Prokaryotes from Eukaryotes Pre-Molecular Concept of Organismal Diversity Sizes, shapes, and motility of Bacteria and Archaea ( Figure 28.13 ). After 150 years of studying prokaryotic colonies in petri dishes, scientists have finally acquired an arsenal of molecular, DNA-based techniques that allow them to study the organisms in their natural environments. "What can be cultured is only a very small fraction of what's out there. Microbial organisms are much more diverse than we ever imagined. We are just beginning to understand how vast that diversity might be." Assaying prokaryotic diversity was, until recently, limited by what we could grow in culture - this is no longer the case Universal Tree of Life based on Ribosomal RNA sequences. Archaea were identifed in 1977 by Carl Woese based on their phylogenetic distinctiveness. He went on to propose the 3-domain model oF liFe. Archaeans are Found in all habitats, many are extremophiles, none are known to be pathogens; they are by Far the least understood domain oF liFe. Archaea live in virtually every habitat, including extreme environments like hot springs. Lecture 27: Wednesday, November 5, 2008 Biology 171 Todays Topic: The Prokaryotic World Announcements This Week in Discussion: Bacterial Diversity - Your Gut Flora Exam III Monday, November 17 Text Reading Lec 27: 2 nd ed: Chapter 27 (582-604) 3 rd ed: Chapter 28 (566-590) Lec 28: 2 nd ed: Chapter 34 (780-800) 3 rd ed: Chapter 35 (769-789) Prokaryotes/Bacteria/Archaea/Eukarya Reproduction & Pathogenesis Conjugation & Antibiotic Resistance Electron Donor/Acceptor Diversity Extremophiles Life in Sediments - Redox Potential Hot Vent Symbiosis Prokaryotic Cell Division (Binary Fission)...
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This note was uploaded on 01/30/2012 for the course BIO 171 taught by Professor Josephinekurdziel during the Fall '08 term at University of Michigan.

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Bio171-F08-lec27 - Lecture 27: Wednesday, November 5, 2008...

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