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6. If the gram stain is negative what can be assumed about the peptidoglycan and outer membrane?

  • It is thin
  • It is thick
  • It is permeable

7. Blood is an example of

  • Differential agents
  • Culture media
  • Selective agents
  • Polysaccharide

8. What is the inoculum in culture media?

  • Nutrient solution for growing microorganisms
  • Initial small number of cells added grown to give a culture
  • A culture growing on an agar plate

9. At what temperature does agar melt?

  • 80'C
  • 400'C
  • 100'C
  • 200'C

10. What is the approximate WxL of E.coli

  • 1500nm x 4000 nm
  • 1500nm x 5000nm
  • 1300nm x 4000nm
  • 1300nm x 5000nm

11. In the bacterial cell wall there are meshlike polymers of identical subunits forming long strands

  • True
  • False

12. Crystal violet is an example of

  • Selective agents
  • Complex differential media
  • Culture media
  • Polysaccharide

13. Which is not a microscopic observation?

  • Size and shape
  • Age
  • Endospores - present or absent
  • Motility
  • Gram stain
  • Arrangement

14. What is peptidoglycan?

  • A rigid structure that lies just outside the cell plasma membrane
  • A fluid structure that lies inside of the cell

15. Which test looks for the presence of cytochrome c oxidase?

  • Oxidase test
  • Oxidation test
  • Cytochrome c test

16. NaCl is an example of

  • Polysaccharide
  • Complex differential media
  • Selective agents
  • Culture media

17. In an oxidase test, negative results show as what colour?

  • Colourless
  • Cream
  • Blue
  • Purple

18. Some gram positive bacteria have layer of proteins on surface of peptidoglycan

  • True
  • False

19. Fermentable carbohydrate plus pH indicator is an example of what?

  • Polysaccharide
  • Culture media
  • Differential agents
  • Selective agents

20. Gram negative cell walls have teichoic acids

  • False
  • True