Growth, detection and characterization of bacteria

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1. What is water activity?

  • The intensity at which water associates with various non-aqueous molecules
  • The intensity at which water associates with various aqueous molecules
  • The intensity at which water disssociates with various non-aqueous molecules
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2. Which types of bacteria grow in temperatures above 45 degrees?

  • Thermophiles
  • psychrophiles
  • mesophiles

3. What is added to a selective media?

  • an inhibitory substance or an indicator
  • substances like blood, serum, egg
  • Nutrients

4. What media is used in stab culturing?

  • blood agar
  • gelatin or glucose
  • Agar

5. What is the disadvantage of liquid cultures?

  • Only motile bacteria can reproduce
  • Does not provide a pure culture from mixed innocula
  • Kills off bacteria
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