Microbiology Microbial ecology

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p.reilly1227
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81989
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Microbiology Microbial ecology
Updated:
2011-04-28 09:36:28
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Microbiology Microbial Ecology Test Three
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Microbiology Microbial ecology
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  1. What are the 5 enviornmental factors for microbial growth?
    • Oxygen level
    • Availability of nutrients (N, P, S, Minerals )
    • Temp
    • Salinity
    • pH
  2. What are the 4 types of symbiotic interactions? What do they mean?
    • Mutualism: both partners benefit from specific association
    • Synergism: Both partners benefit from non-specific association
    • Amensalism: One partner is harmed by non-specific association
    • Parasitism: One partner is harmed by specific association
  3. 3 Soil microbial mutualisms are __?__.
    • Rhizosphere (root surface) colonized by bacteria (lose cell wall)
    • Legumes (beans) - Rhizobium ( bacteria looses cell wall)
    • Fungi (essential for plant growth) - endo/ecto
  4. What are the 4 various areas of a marine enviornment + special considerations?
    • Neuston: air-water interface (10 microns thick - most microbes)
    • Euphotic: phototrophy is possible
    • Aphotic: few organisms
    • Benthos: Where water meets ocean floor and sediment - minerals available
    • Special consideration = temp and pressure
  5. What is Plankton?
    passively floating organisms
  6. What is Marine Snow?
    Bacteria attached to small floating particles
  7. How do you count organisms in marine enviornment?
    • DNA content - fluorescent (count individually), sequence DNA in water sample
    • Measure biomass - chemical assay of organic matter
    • Carbon fixation - incoroporation of radiolabeled CO2
  8. What is the ocean floor enviornment like?
    • High pressure = barophilic organisms
    • Cold
    • Carbon source is from detritous floating above
  9. What do thermal vents provide?
    • High temps
    • Reduced minerals
  10. What do microbes do in thier enviornments?
    • Assimilate minerals
    • Absorb energy (producers)
    • At all levels of food web (produces, consumers, decomposers)

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