Help please!
A biochemist studies the fate of pyruvate in yeast cells under aerobic conditions when treated with four different substances (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.

Question

Help please! 
A biochemist studies the fate of pyruvate in yeast cells under aerobic conditions when treated with four different substances (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.

naturesweetie · Answer

Which describes the fate of pyruvate when cells were treated with Substance D?

naturesweetie · Answer

a. Pyruvate is oxidized by the Krebs cycle.
b.   Pyruvate is oxidized by lactate fermentation.
c  Pyruvate is oxidized by glycolysis.
d.  Pyruvate is oxidized by alcoholic fermentation.

anonymous · Answer

The answer is D.  There is alcohol produced in the second graph when  Substance D is applied.  The first graph shows low Krebs cycle activity when Substance D is applied.