bacteria lecture text - Chapter 11 The Prokaryotes Domains...

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Unformatted text preview: Chapter 11 The Prokaryotes: Domains Bacteria and Archaea The Prokaryotes: Domains Bacteria and Archaea • One circular chromosome, not in a membrane • No histones • No organelles • Peptidoglycan cell walls • Binary fission • Proteobacteria • Mythical Greek god, Proteus, who could assume many shapes • Gram- negative Domain Bacteria • Human pathogens: • Bartonella • B. hensela Cat-scratch disease • Brucella Brucellosis The α (alpha) Proteobacteria • Obligate intracellular parasites: • Ehrlichia . Tick-borne, ehrlichiosis • Rickettsia . Arthropod-borne, spotted fevers • R. prowazekii Epidemic typhus • R. typhi Endemic murine typhus • R. rickettsii Rocky Mountain Spotted Fever The α (alpha) Proteobacteria The α (alpha) Proteobacteria Figure 11.1 • Wolbachia . Live in insects and other animals The α (alpha) Proteobacteria • Have prosthecae: • Caulobacter . Stalked bacteria found in lakes • Hyphomicrobium . Budding bacteria found in lakes The α (alpha) Proteobacteria Figure 11.2 & 3 • Plant pathogen: • Agrobacterium . Insert a plasmid into plant cells, inducing a tumor The α (alpha) Proteobacteria Figure 9.17 • Chemoautotrophic: • Oxidize nitrogen for energy • Fix CO 2 • Nitrobacter . NH 3 + → NO 2 – • Nitrosomonas . NO 2 – → NO 3 – The α (alpha) Proteobacteria • Nitrogen-fixing bacteria: • Azospirillum • Grow in soil, using nutrients excreted by plants • Fix nitrogen • Rhizobium • Fix nitrogen in the roots of plants The α (alpha) Proteobacteria Figure 27.5 •...
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This note was uploaded on 01/16/2012 for the course BIOLOGY 251 taught by Professor Lancebowen during the Fall '10 term at Truckee Meadows Community College.

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bacteria lecture text - Chapter 11 The Prokaryotes Domains...

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