micro fundamentals

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Author:
brogdert
ID:
54731
Filename:
micro fundamentals
Updated:
2010-12-09 23:07:59
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second exam
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fundamentals
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  1. Mesophiles
    • Most bacteria fall in this range
    • All human pathogens
  2. Aerobes (Aerobic)
    need plentiful oxygen
  3. Anaerobes (Anaerobic)
    • need an oxygen-free environment.
    • Poisoned by oxygen
  4. Microaerophiles(Microaerophilic)
    Require low oxygen concentration
  5. Canophiles (Canophilic)
    Require love oxygen and increased carbon dioxide
  6. Autotrophs
    synthesize own food from simple inorganic carbon sources (ie: carbon dioxide)
  7. Heterotrophs
    must obtain pre-formed organic molecules from environment
  8. Saprobes (saprophytes)
    feed exclusively on dead organic matter
  9. Parasites
    feed on living organic matter
  10. Pathogen
    parasite that causes disease in host organism
  11. Nutrient Broth
    water, beef extract, and peptone
  12. Nutrient Agar
    • solid medium
    • consists of nutrient broth and agar
  13. Enriched Media
    used for preliminary isolation that favors the growth of a particular microorganism
  14. Selective Media
    Ingredients inhibit certain bacteria and encourage others
  15. Differential Media
    • ingredients allow colonies of different microorganisms to be more easily distinguished from each other
    • (strep throat now quickly identified)
  16. Bacteria Growth phases
    • lag phase – initialexposure
    • exponential growth phases– aka log phase (symptoms start to appear)
    • stationary phase –bacteria are starting to run out of nutrients/resources so there are equal numbers of bacteria replication and death
    • death – aka logarithmicdecline phase (this is where we start seeing endospore formation)
  17. streak plate method
    streak bacteria across solid medium
  18. pour plate method
    • bacterial sample diluted in several tubes of agar medium
    • agar poured into Petri dishes
    • bacteria form discrete colonies where diluted the most
    • used to estimate the number of original organisms present
  19. Symbiosis
    two populations of organisms interact in a close and permanent association
  20. Mutualism
    interation benefits both organisms
  21. Commensalism
    one organism derives benefit while the other neither benefits or is harmed
  22. Synergism
    two organisms living together resulting in them being able to accomplish what neither organism could do on its own
  23. Parasitism
    relationship beneficial to one organism but harmful to the other

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