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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.


In Cell D, which process completely oxidizes pyruvate?

a) Krebs cycle

b) glycolysis

c) alcoholic fermentation

d) lactic acid fermentation


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