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Lecture17%20Bacteria - Bacteria and Archaea I Goals for the...

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Bacteria and Archaea I. Goals for the diversity section of this course: 1. Biological literacy • My nephew’s question: • Reading the newspaper: • Walking through the woods or 2. Understanding model systems used in Biology 200, 220, and upper division courses. 3. Career training First: Who are these guys? A. Who they are related to: Tree of Life B. What they look like: Morphological diversity C. Where they live: Habitat diversity Second: What’s cool about them? • What do they do that’s unique and interesting? • How do they make a living? • Why did they diversify? II. Bacteria and Archaea: Who are these guys? A. The tree of life 3 domains Bacteria Archaea Eukarya Which group is most closely related to Eukaryotes: Bacteria or Archaea? • Was characteristics did the common ancestor of all organisms living today have?
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B. Morphology • Bacteria and Archaea are prokaryotes--the chromosome(s) is NOT surrounded by a nuclear envelope • Almost all are unicellular; in most species, • Cell sizes vary from 0.5 mm in diameter to 0.15 mm in diameter
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