Microbiology B.E Pruitt & Jane J. Stein AN INTRODUCTION EIGHTH EDITION TORTORA FUNKE CASE Chapter 11, part A The Prokaryotes: Domains Bacteria and Archaea.

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Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings PowerPoint ® Lecture Slide Presentation prepared by Christine L. Case Microbiology.
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Microbiology B.E Pruitt & Jane J. Stein AN INTRODUCTION EIGHTH EDITION TORTORA FUNKE CASE Chapter 11, part A The Prokaryotes: Domains Bacteria and Archaea

One circular chromosome, not in a membrane No histones No membrane bounded organelles (ribosomes) Peptidoglycan cell walls (NOT in Archaea) Binary fission

Gram-negative groups: Proteobacteria Mythical Greek god, Proteus, who could assume many shapes By RNA sequencing  Proteobacteria: Human pathogens Brucella Bartonella Obligate intracellular Rickettsia Ehrlichia Have prosthacae Caulobacter Chemoautotrophic Nitrobacter Nitrosomas Fix nitrogen Rhizobium Azospirillum Produce acetic acid Acetobacter Domain Bacteria: Proteobacteria

 (alpha) Proteobacteria Human pathogens: Bartonella B. henselaCat-scratch disease BrucellaBrucellosis The  (alpha) Proteobacteria The alpha-proteobacteria include nitrogen-fixing bacteria, chemoautotrophs, and chemoheterotrophs. Some members of this sub-phylum grow at low-nutrient levels (oligotrophic) and some have stalks (prosthecae). Some are pathogens and some are intracellular.

Obligate intracellular parasites: Rickettsia.  Arthropod-borne, spotted fevers R. prowazekiiEpidemic typhus - lice R. typhiEndemic murine typhus - flea R. rickettsiiRocky Mountain Spotted Fever - tick The  (alpha) Proteobacteria

Figure 11.1

Those with prosthecae: Caulobacter. Stalked bacteria found in lakes. Use stalk for obtaining nutrients Hyphomicrobium. Budding bacteria found in lakes The  (alpha) Proteobacteria Figure 11.2 & 3

A plant pathogen: Agrobacterium. Insert a plasmid into plant cells, inducing a tumor The  (alpha) Proteobacteria Figure 9.17

Nitrogen Cycle Chemoautotrophic: Oxidize nitrogen for energy Fix CO 2 Nitrosomonas NH 3 +  NO 2 – Nitrobacter NO 2 –  NO 3 – Book has this reversed incorrectly The  (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  (alpha) Proteobacteria Figure 27.5

Produce acetic acid from ethyl alcohol: Acetobacter - Pasteur The  (alpha) Proteobacteria

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