ACT Science Practice Question #1852 (Hard (580)) | Test Citadel
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ACT Science Difficulty: Hard (580)

Digital ACT Science Practice Question #1852

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Why did the anaerobic culture consume nearly four times more glucose (48.6 g vs 12.4 g) than the aerobic culture? Experiment Context (Metabolic Byproducts of Saccharomyces cerevisiae): Yeast cultures were supplied with 5% glucose solutions under aerobic conditions (sparged with air) versus anaerobic conditions (sparged with nitrogen gas) for 4 hours at 30°C: Table 33: - Condition 1 (Aerobic): Glucose Consumed = 12.4 g; Ethanol Produced = 0.2 g; CO2 Produced = 18.2 g; ATP Yield = ~32 ATP/glucose - Condition 2 (Anaerobic): Glucose Consumed = 48.6 g; Ethanol Produced = 24.1 g; CO2 Produced = 23.5 g; ATP Yield = 2 ATP/glucose
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Pasteur Effect: low ATP yield forces higher glucose consumption.

Masterclass Solution & Distractor Trap Analysis

The Pasteur Effect: inefficient anaerobic fermentation (2 ATP/glucose vs 32) requires vastly higher glucose consumption to sustain ATP requirements....

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

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