Microbiology Lab Exam 3

61 Questions | Total Attempts: 452

Microbiology Lab Quizzes & Trivia

For the micro lab exam 3

Questions and Answers
  • 1. 
    ___ ___ is an example of an enriched, differential media that contains trypticase soy agar with 5 or 10% ___ ___ added to the agar
  • 2. 
    This is the change of appearance of the agar surrounding individual colonies when bacteria are able to utilize RBCs
  • 3. 
    The COMPLETE destruction ofhemoglobin within the RBCs, the media may look yellow
  • 4. 
    The PARTIAL destruction of the hemoglobin within the RBC's, the media appears green/brown around the individual colonies
  • 5. 
    NO destruction of the hemoglobin within the RBC's, the media appears red around the individual colonies
  • 6. 
    True or False: both Staphylococcus and Streptococcus species have the ability to break down hemoglobin, thus other methods ofdifferentiation of these species are required.
  • 7. 
    E.Focalis is an example of
  • 8. 
    In a bile esculin test, a black color represents a ___ reaction while a yellow color represents a ___ reaction
  • 9. 
    In a 6.5% NaCL test (salt) purple indicates ___ while yellow indicates ___
  • 10. 
    In a coagulase test, a clot indicates___ while a liquid indicates ___
  • 11. 
    In Mannitol Salt agar, yellow indicates a ___ use of mannitol while pink indicates a ___ use of mannitol
  • 12. 
    Mannitol Salt Agar inhibits gram ___
  • 13. 
    Mannitol Salt Agar is ___/___ that inhibits the growth of gram ___
  • 14. 
    The high salt content in Mannitol Salt Agar selects for ___
  • 15. 
    Biochemical testing can only be done on ___ cultures
  • 16. 
    This breaks down hydrogen peroxide into water and oxygen
  • 17. 
    ___ produce catalase, but ___ do not
  • 18. 
    ___ is a common component of our skin flora
  • 19. 
    ___ is an enzyme that causes fibrin in plasma to clot
  • 20. 
    ___ ___ is the only staphylococcus species that produces coagulase
  • 21. 
    A coagulase test is used to differentiate ___ from ___
  • 22. 
    The sugar ___ gives mannitol salt agar its differential properties
  • 23. 
    When mannitol is fermented (utilized by bacteria) microorganisms release acidic byproducts that change the PH of the surrounding media.  The PH change is indicated by a change in the PH indicator ___ ___ from pink to yellow
  • 24. 
    ___ is used to identify Group A strep, the cause of strept throat.  Group A strep are the only species group that aresensitive to this antibiotic and can be detected by a zone of inhibition around the __ __ __
  • 25. 
    ___ ___ testing is used to identify ___ which can cause urinary tract as well as opportunist infections
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