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A biochemist studies the fate of pyruvate in four different cell types (A-D). She incubates each cell with

1-14C-pyruvate and measures the ATP content and the radioactive carbon dioxide, ethanol, and lactic acid produced in each cell type. She repeats the experiment using 2-14C-pyruvate, which is a measure of Krebs cycle activity. The results are shown in the graphs.

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In Cell D, which process completely oxidizes pyruvate?


a) Krebs cycle

b) glycolysis

c) alcoholic fermentation

d) lactic acid fermentation

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