MicroBiology Home   Microbiology, 4/e               Prescott, Harley, Klein
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Chapter 6
Supplemental Quiz Question

The following data were obtained by standard plate counts during growth of E. coli in a defined medium containing glucose as the carbon source at 37oC while shaking on an orbital platform.

Time Number of Bacteria
3:00 2.9 X 103
4:00 1.2 X 103
5:00 2.3 X 103
6:00 7.2 X 104
7:00 6.5 X 105
8:00 8.4 X 106
9:00 6.2 X 107
10:00 6.9 X 107
11:00 6.1 X 107
12:00 5.7 X 106
1:00 6.6 X 105
2:00 5.5 X 104

The number of generations in log phase is ________.
A. 1.3
B. 14.7
C. 15.8
D. 10.6
E. 20.0

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