ACT Science Practice Question #1777 (Hard (550)) | Test Citadel
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ACT Science Difficulty: Hard (550)

Digital ACT Science Practice Question #1777

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The plateau in population density between Hour 6 and Hour 8 is most likely caused by: Experiment Context (Bacterial Population Growth Phases): Microbiologists inoculated a nutrient broth with Escherichia coli at 37°C and sampled optical density at 600 nm (OD600, proportional to bacterial cell count) over 10 hours: Table 8: - Hour 0: OD600 = 0.05 (Lag phase) - Hour 1: OD600 = 0.06 (Lag phase) - Hour 2: OD600 = 0.18 (Log phase) - Hour 3: OD600 = 0.52 (Log phase) - Hour 4: OD600 = 1.48 (Log phase) - Hour 6: OD600 = 2.20 (Stationary phase) - Hour 8: OD600 = 2.22 (Stationary phase) - Hour 10: OD600 = 1.65 (Death phase)
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Stationary phase = nutrient depletion and waste accumulation.

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Stationary phase is reached when nutrient depletion and waste accumulation balance division and death rates....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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