1 / 11

Chapter 11, part A

Chapter 11, part A. The Prokaryotes: Domains Bacteria and Archaea. 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.

rainer
Télécharger la présentation

Chapter 11, part A

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 11, part A The Prokaryotes:Domains Bacteria and Archaea

  2. 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

  3. Domain Bacteria: Proteobacteria • 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

  4. 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. •  (alpha) Proteobacteria • Human pathogens: • Bartonella • B. hensela Cat-scratch disease • Brucella Brucellosis http://www.cdc.gov/ncidod/dbmd/diseaseinfo/brucellosis_g.htm#top

  5. The  (alpha) Proteobacteria • Obligate intracellular parasites: • Rickettsia. Arthropod-borne, spotted fevers • R. prowazekii Epidemic typhus - lice • R. typhi Endemic murine typhus - flea • R. rickettsii Rocky Mountain Spotted Fever - tick

  6. The  (alpha) Proteobacteria Figure 11.1

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

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

  9. The  (alpha) Proteobacteria • Nitrogen Cycle • Chemoautotrophic: • Oxidize nitrogen for energy • Fix CO2 • Nitrosomonas NH3+ NO2– • Nitrobacter NO2– NO3– • Book has this reversed incorrectly

  10. 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 Figure 27.5

  11. The  (alpha) Proteobacteria • Produce acetic acid from ethyl alcohol: • Acetobacter - Pasteur http://www.winepros.org/wine101/enology.htm

More Related