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Bio171-F10-Lec 27 - Biology 171 Monday Lecture 27 The...

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Biology 171 Monday, November 15, 2010 Lecture 27: The Prokaryotic World Text Reading Lecture 27 : 4 th : Chapter 27 (496-516) 3 rd : Chapter 27 (566-590) Lecture 28 : 4 th : Chapter 35 (675-692) 3 rd : Chapter 35 (769-789) Extinction (concluded) Prokaryotes/Bacteria/Archaea/Eukarya Reproduction & Pathogenesis Conjugation & Antibiotic Resistance Electron Donor/Acceptor Diversity Extremophiles Life in Sediments - Redox Potential Hot Vent Symbiosis 1
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This week in Discussion: Reconstructing Phylogeny Exam 3 – Wed. Nov. 17 8-10PM Exam covers lectures 20-27 Discussions 6-8: (Genetics Problems, Evolution/Pop. Genetics, Sexual selection/speciation) Biology 171 Monday, November 15, 2010 Lecture 27: The Prokaryotic World Announcements 1 Special Office Hours Wednesday, Nov. 17 9-11 AM 1-3 PM
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Marine Animal Diversity Profile Over Time 31
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Diversity Profiles of Major Animal Clades Through Time 32
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The end-Ordovician mass extinction (450mya) was the second worst in earth’s history. Global cooling may have been responsible as evidenced by glacial deposits in then tropical Australia. 33
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The end-Permian mass extinction (250mya) was the worst in earth’s history, with over 90% of species dying. 34
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The end-Permian mass extinction (250mya) was the worst in earth’s history, with over 90% of species dying. The Siberian traps are end-Permian flood basalt deposits covering up to 7m km 2 . Volcanism caused warming, increased CO 2 , and toxic gas increases. 35
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The end-Cretaceous mass extinction (65mya) is the best studied. Around 75% of species went extinct. 36
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The end-Cretaceous mass extinction (65mya) is the best Studied. Around 75% of species went extinct. There is strong evidence that a 10km asteroid struck the earth in the Caribbean region. 37
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In terms of complexity, the primary distinction among living organisms separates Prokaryotes from Eukaryotes 2
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Pre-Molecular Concept of Organismal Diversity 3
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Sizes, shapes, and mobility of Bacteria and Archaea ( Figure 28.7 ).
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