56. A colony of Escherichia coli is inoculated from a Petri dish into a test tube containing 50 mL of nutrient broth. The test tube is placed in a 37°C incubator/shaker; after one hour, the number of bacteria in the test tube is determined to be 8 x 106. Given that the doubling time of E. coli is 20 minutes with agitation at 37°C, approximately how many bacteria should the test tube contain after eight hours of growth? a. 2.56 x 108 b. 2.05 × 10⁹ 17 x 10¹4

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