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6. What is added to a selective media?

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

7. What is the disadvantage of liquid cultures?

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

8. What is added to an enriched medium?

  • substances like blood, serum, egg
  • Nutrients
  • Complex polysaccharides

9. What does a complex media do?

  • include blood, egg or serum
  • provide special nutrients
  • provide special temperatures

10. Which of these is a use of lawn culture?

  • preparing antibodies
  • Bacteriophage typing
  • pregnancy test

11. What media is used in stab culturing?

  • blood agar
  • gelatin or glucose
  • Agar

12. Which types of bacteria grow in temperatures above 45 degrees?

  • Thermophiles
  • psychrophiles
  • mesophiles

13. What is water activity?

  • The intensity at which water disssociates with various non-aqueous molecules
  • The intensity at which water associates with various non-aqueous molecules
  • The intensity at which water associates with various aqueous molecules

14. What is a special media based on?

  • Oxygen requirement
  • Nutrient requirement
  • temperature requirement

15. Which bacteria retain the crystal violet dye in the gram staining protocol?

  • Gram + and -
  • Gram +
  • Gram -