3) If you were to add one of the eight Citric Acid Cycle intermediates to the culture medium of yeast growing in the laboratory, what do you think would happen to their rates of ATP and carbon dioxide production? (Assume no negative feedback occurs) There would be no change in ATP production, but we would observe an increased rate of carbon dioxide production. The rates of ATP production and carbon dioxide production would both increase. Rates of ATP and carbon dioxide production would probably both decrease. The rate of ATP production would decrease, but the rate of carbon dioxide production would increase.

The citric acid cycle, or the Krebs cycle, is the name given to a series of reactions used by all aerobic organisms for the release of stored energy from a wide range of sources, including: carbohydrates, fats, and proteins. The end product of the citric acid cycle is adenosine triphosphate (ATP), obtaining two ATP molecules per glucose, as well as two molecules each of carbon dioxide and water. Therefore, if one of the eight intermediates of the citric acid cycle are added to the culture medium of a yeast growing, the expected result will be to enhance the use of this cycle by the yeast, and the rates of ATP production and carbon dioxide production would both increase.