Ch 3 Micro

  1. Which of the following is NOT equal to 1 m?





    D)
  2. What structure does light pass through after leaving the condenser in a compound light microscope?



    D)
  3. Which of the following pairs is mismatched?




    A)
  4.  Place the steps of the Gram stain in the correct order: 1-Alcohol-acetone; 2-Crystal violet; 3-Safranin; 4-Iodine.




    C)
  5. Which of the following pairs is mismatched?




    C)
  6. The counterstain in the acid-fast stain is





    D)
  7. The purpose of a mordant in the Gram stain is




    C)
  8. Place the following steps in the correct sequence: 1-Staining; 2-Making a smear; 3-Fixing.




    B)
  9. The best use of a negative stain is




    D)
  10. Simple staining is often necessary to improve contrast in this microscope.




    C)
  11. Which microscope is used to see internal structures of cells in a natural state?




    C)
  12. Which of the following microscopes uses visible light?




    C)
  13. Which microscope achieves the highest magnification and greatest resolution?




    D)
  14. In this microscope, the observer does NOT look at an image through a lens.




    B)
  15. This microscope produces an image of a light cell against a dark background; internal structures are NOT visible.




    B)
  16. Which of the following is NOT correct?




    C)
  17. The counterstain in the Gram stain is




    C)
  18. Which microscope can be used to visualize DNA or botulinum toxin?




    E)
  19. Which microscope is used to observe a specimen that emits light when illuminated with an ultraviolet light?A) Compound light microscopeB) Phase-contrast microscopeC) Darkfield microscope
    D
  20. Which microscope is most useful for visualizing a biofilm?




    D)
  21. Which microscope takes advantage of differences in the refractive indexes of cell structures?




    E)
  22. The appearance of gram-positive bacteria after addition of the first dye in the Gram stain.



    D)
  23. The appearance of gram-negative bacteria after addition of the mordant in the Gram stain.



    B)
  24. The appearance of gram-negative bacteria after addition of the decolorizing agent in the Gram stain.



    D)
  25. The appearance of gram-positive bacteria after adding the counterstain in the Gram stain.



    D)
  26. The appearance of gram-negative bacteria after completing the Gram stain.



    A)
  27. Which of the following pairs is mismatched?




    C)
  28. What is the total magnification of a chloroplast viewed with a 10x ocular lens and a 45x objective lens?




    C)
  29. You suspect a 100-nm structure is present in a cell. Which of the following provides the lowest magnification that you can use to see this structure?




    C)
  30. Which microscope uses two beams of light to produce a three-dimensional, color image?




    E)
  31. Which microscope is used to see intracellular detail in a living cell?




    B)
  32. In which microscope does the image look like a negative stain?




    C)
  33. Which microscope is used to see detail of a 300-nm virus?




    B)
  34. Assume you stain Bacillus by applying malachite green with heat and then counterstaining with safranin. Through the microscope, the green structures are




    B)
  35. Cells are differentiated after which step in the Gram stain?



    B)
  36. You find colorless areas in cells in a Gram-stained smear. What should you do next?




    C)
  37. What Gram reaction do you expect from acid-fast bacteria?



    A)
  38. Bacterial smears are fixed before staining to




    B)
  39. The resolution of a microscope can be improved by changing the




    B)
  40. Van Leeuwenhoek's microscope magnified up to 300x. This was a(n)




    B)
  41. The purpose of the ocular lens is to




    D)
  42. The signal molecule produced in quorum sensing is




    E)
Author
XQWCat
ID
173834
Card Set
Ch 3 Micro
Description
Microbiology Chapter 3 test questions
Updated