AP Biology Quiz
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CELLULAR ENERGETICS
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A student compares ATP generation in two conditions using the same number of glucose molecules. In Condition 1, cells have normal oxygen and functional mitochondria; in Condition 2, oxygen is absent but glycolysis enzymes are intact. In both conditions, glycolysis produces ATP by substrate-level phosphorylation and generates NADH. In Condition 1, NADH delivers electrons to the electron transport chain, supporting proton pumping and ATP synthase activity. In Condition 2, electron transport cannot proceed because oxygen is unavailable as the terminal electron acceptor. Which prediction about ATP yield per glucose is most likely correct?
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