ACT Science Practice Question #1853 (Hard (610)) | Test Citadel
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ACT Science Difficulty: Hard (610)

Digital ACT Science Practice Question #1853

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Under anaerobic conditions, the biological function of converting pyruvate into ethanol and CO2 is to: 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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Fermentation regenerates NAD+ to sustain glycolysis.

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Fermentation regenerates NAD+ by reducing pyruvate/acetaldehyde, enabling continued substrate-level phosphorylation in glycolysis....

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