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Microbiology: Chapter 7

35 Questions  I  By Kaiello
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1.  Optimal temperatures of 35-40 degrees C, range 10-50. They are the most common, most pathogens are this type. 
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B.
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D.
E.
2.  Optimal temperatures are 50-60 degrees C, and range from 40-70. 
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B.
C.
D.
E.
3.  In this phase the number of cells remains the same, because the rate of death equals the rate of growth. 
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B.
C.
D.
4.  Halophiles are a type of bacteria that can exist in this type of condition. 
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B.
C.
5.  CULTURE MEDIA: Liquid
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B.
6.  Which of these words describes when a cell is in its highest temperate environment in which it can still grow?
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B.
C.
7.  Can cold kill bacteria?
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B.
8.  Need oxygen, but only will grow under low oxygen concentrations (soil, water) 
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9.  Generation time is the time it takes for one cell to become 
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10.  In order to determine the number of bacterial cells present we must serially dilute the sample, and plate the dilution until a countable plate is reached. Then, count the colonies and multiply by the dilution factor. 
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B.
11.  This chemical requirement, phosphorous, is taken in with inorganic phosphate (PO4^(-3)) 
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C.
12.  CULTURE MEDIA: Solid 
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B.
13.  Catalase is an enzyme that aids in the conversion of which of these?
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C.
14.  Bacteria divide by which of the following?
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C.
15.  This phase of growth has little growth, and high metabolic activity. 
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D.
16.  Bacterial cells grow how?
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17.  Can grow at 0 degrees C, optimum at <15 degrees. Are considered obligate with respect to cold. Live normally in arctic conditions. 
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18.  The need for oxygen to live is an....
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19.  This phase has an exponential decline.
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20.  Cannot tolerate oxygen. This is an example of 
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21.  Will not use oxygen, but it wont kill them. This is an...
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E.
22.  Which are the only two types of bacteria that humans come into contact with normally?
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B.
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D.
23.  Can grow at 0 degress C, optimum is about 20-30 degrees. Most important with food spoilage. 
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24.  Peroxidase is an enzyme that aids in the conversion of which of these? 
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B.
C.
25.  Which of these words describes when a cell is in its lowest possible temperate environment in which it can still grow?
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B.
C.
26.  Like all organisms, bacteria have both ______ and _______ requirements if they are to grow 
27.  Growth usually refers to the increase in which of these
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B.
28.  Which of these words describes when a cell is in an environment of its "best growth"
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B.
C.
29.  The chemical need for atmospheric nitrogen (N2) is normally found within
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C.
30.  Most bacteria thrive in a neutral pH, some are called acidophiles whose optimal pH can be as low as what?
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B.
C.
D.
31.  May use oxygen if present, but can exist without it (fermentation). This is an
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D.
E.
32.  Superoxide dismutase is an enzyme that helps the conversion of which of these?
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C.
33.  Optimum temperatures are 80 degrees C or greater (usually archea). Found in volcanoes 
A.
B.
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34.  This phase has exponential growth. 
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B.
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D.
35.  The chemical need for ammonia, nitrate, or nitrite is found within 
A.
B.
C.
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