Microbio 8

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Author:
Morgan.liberatore
ID:
138047
Filename:
Microbio 8
Updated:
2012-02-27 08:14:55
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Microbio
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icrobio 8
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  1. What pigments are required for photosynthesis?
    Light sensitive pigments
  2. What type of phototrophs have chlorphyll a?
    Osygenic phototrops
  3. What kind of phototrophs have Bacteriochlorophyll a?
    Anoxygenic phototrophs
  4. How is chlorophyll or bacteriochlorophyll often arranged?
    Pftem arramged in photocomplexes containing other photosensitive pigments and proteins
  5. Which pigments participate directly in photosnthesis?
    Only the pigments in the reaction center
  6. What is the purpose of the pigments that surround the reaction center?
    They act as antenna to harvest light and funnel its energy into the reaction center
  7. What are caroenoids?
    Hydrophibic, light-sensitive pigments firmly embedded in the photosynthetic membrane
  8. What is the primary role of carotenoids?
    To protect the system against bright light, which may lead to production of toxic forms of oxygen
  9. What do phycobilins do>
    Form complexes with proteins that are in the main light-harvesting systems in cyanobacteria: phycobilisomes
  10. Where does photosynthesis take place in eukaryotes?
    Chloroplasts
  11. Where does photosynthesis occur in prokaryotes?
    The photosynthetic pigments are interated into the internal membrane
  12. What is the best photosystem to capture energy at very low light intensity?
    Chlorosomes
  13. Which prokaryotes are chlorosomes found?
    Green sulphur and green non sulpur bacteria
  14. Which prokaryotes use oxygenic photosynthesis
    Algae, cyanobacteria
  15. How is oxygen used in photosynthesis?
    Use light energy to oxidize H2O and the e- go to the electron transport chain that leads to the generation of a pmf that drives ATP synthase
  16. How does anoxygenic photosynthesis take place?
    • H2S inhibits PsII
    • Oxidized H2S as electron source
    • e- goes through the electron transport chain that leads to the creation of a pmf that drives ATP synthase
  17. What are chemoautotrophs?
    Use inorganic compounds as a source of energy and electrons and CO2 as carbon source
  18. What do nitrigying bacteria use as an electron donor?
    Ammonia and nitrite
  19. What do nitrosomonas do?
    • Oxidize ammonia to nitrite and another group to oxidize nitrite to nitrate
    • Nitrite is toxic, nitrate is a better source of nitrogen for plants
  20. What conditions does nitrification need to occur?
    Aerobic condition
  21. How is energy produced in nitrobacter spp??
    • Nadh is produced by reverse electrons flor
    • pmf is the energy source
    • Very low yield
  22. How is energy produced in sulfur bacterias?
    • oxidize sulphur compounds, with O2 as an electron acceptor
    • Produce SO42- and a proton (acid run-off from coal mines)
    • sulfide H2S) is stored in cell
  23. How is acid run-off from coal mines produced?
    Sulfur bacteria produce SO42- aqnd a proton, which is acidic
  24. Are methanogens aerobe or anaerobe?
    Strict anaerobe
  25. Where are methanogens found>
    Marches
  26. Wht do methanogens produce?
    CH4
  27. Are methanotrophs aerobe or anaerobe?
    Strict aerobe
  28. What do methanotrophs use as a source of energy?
    CH4

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