Ch 6 micro

  1. The addition of which of the following to a culture medium will neutralize acids?




    B)
  2. Salts and sugars work to preserve foods by creating a




    A)
  3. The term facultative anaerobe refers to an organism that




    E)
  4. Which of the following is an advantage of the standard plate count?




    D)
  5. Which of the following is an advantage of the direct microscopic count?




    E)
  6. Which of the following is NOT used to determine metabolic activity?




    E)
  7. Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?




    A)
  8. Most bacteria grow best at pH





    C)
  9. A culture medium on which only gram-positive organisms grow and a yellow halo surrounds Staphylococcus aureus colonies is called a(n)




    C)
  10. A culture medium consisting of agar, human blood, and beef heart is a




    E)
  11. Which of the following pairs is mismatched?




    A)
  12. During which growth phase will gram-positive bacteria be most susceptible to penicillin?




    B)
  13. Which of the following is the best definition of generation time?





    A)
  14. Which of the following is NOT a direct method to measure microbial growth?




    B)
  15. Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?




    E)
  16. Which of the following is an organic growth factor?




    D)
  17. Which of the following is an example of a metabolic activity that could be used to measure microbial growth?




    C)
  18. An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?




    C)
  19. Three cells with generation times of 30 minutes are inoculated into a culture medium. How many cells are there after 5 hours?




    B)
  20. In one hospital, Pseudomonas aeruginosa serotype 10 infected the biliary tract of 10% of 1300 patients who underwent gastrointestinal endoscopic procedures. After each use, endoscopes were washed with an automatic reprocessor that flushed detergent and glutaraldehyde through the endoscopes, followed by a tap water rinse. P. aeruginosa 10 was not isolated from the detergent, glutaraldehyde, or tap water. What was the source of the infections?



    B)
  21. Assume you inoculated 100 cells into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubation for 24 hours, you should have


    C)
  22. The source of nutrients in nutrient agar is




    C)
  23. Which enzyme catalyzes the reaction:  O2- + O2- + 2H+ → H2O2 + O2?




    C)
  24. Which enzyme catalyzes the reaction:  2H2O2 → 2H2O + O2?



    A)
  25. Which enzyme catalyzes the reaction:  H2O2 + 2H+ → 2H2O?




    C)
  26. Patients with indwelling catheters are susceptible to infections because




    B)
  27. Assume you inoculated 100 facultatively anaerobic cells into nutrient agar and incubated the plate aerobically.  You then inoculated 100 cells of the same species onto nutrient agar and incubated the second plate anaerobically.  After incubation for 24 hours, you should have:


    C)
  28. the term trace elements refers to




    B)
  29. Which one of he following temperatures would most likely kill a mesophile?




    A)
  30. Which of the following is not a characteristic of biofilms?



    B)
  31. Which of the following types media would not be used to culture aerobes?




    A)
  32. An organism that has peroxidase and superoxide dismutase but lacks catalase is most likely an:


    C)
Author
XQWCat
ID
176674
Card Set
Ch 6 micro
Description
Ch 6 micro test 2
Updated