A pure culture in exponential growth phase has a bacterial concentration of 6.4 × 10⁸ cells/ml. If the bacterium has a generation time of 1 h, how long ago was the cell concentration 8.0 × 10⁷ cells/ml?
A) 1 h
B) 2 h
C) 3 h
D) 4 h
E) 24 h
Correct Answer:
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