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MCB 2340 microbial growth Quiz, Best review Document, Rasmussen College
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1. Atmospheric gases, nutrients, pH, energy sources, and radiation areall examples of ______factors that affect microbial growth.
environmental
2. the slowed growth or lack of growth of an organism at
temperatures or pH outside of its ideal range is most likely due to
change in its _________enzymes
3. a microorganism is classified as a psychotropic, a mesophile based
on its optimum growth _______temperature
4. A ____ jar could be used to provide an oxygen-free atmosphere for
bacteria that thrive in the absence of oxygen and are inhibited by it
presence. anaerobe
5. All microorganisms use oxygen in their metabolism false
6. The terms aerobic, anaerobic, and microaerophilic are used to
categorize microorganisms based on their _____ requirements.
Oxygen; atmospheric
7. Match each description with the appropriate category. Obligate
aerobe-uses oxygen in its energy metabolism; can process toxic
oxygen by-products obligate anaerobe-does not use gaseous
oxygen in its energy metabolism; unable to process toxic oxygen
by-products facultative anaerobe-can conduct aerobic or
anaerobic metabolism; can process toxic oxygen by-products
microaerophile-unable to grow in the presence of atmospheric
, levels of gasous oxygen, but needs a small amount of oxygen for
its metabolism
8. which of the following organisms is most flexible with regard to its
oxygen requirments? Facultative anaerobe
9. the pink color in a tube of fluid thioglycollate medium (FTM)
indicates the _____ of oxygen presence
10. a tube of fluid thioglycollate medium is inoculated with a
bacterial isolate. after incubation, the bacteria appear to be growing
throughout the tube. this bacterial isolate is most liekly a
facultative anaerobe
11. Escherichia coli-facultative anaerobe; clostridium
sporogenes-obligate anaerobe; micrococus luteus-obigate aerobe
12. Based on this FTM tube result, how would you classify this
organism? facultative anaerobe
13. in an anaerobe jar, oxygen is absent
14. which of the following organisms are expected to grow
within an anaerobe jar? Faculative anaerobes; obligate anaerobes;
aerotolerant anaerobes
15. where would you expect to see growth for an obligate
aerobe? On the plate placed on the incubator shelf, not within an
anaerobe jar
16. which organisms should be able to grow in the anaerobe jar
obligate anaerobe; facultative anaerobe
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