Predict what will happen to the concentration of pyruvate, NADH and H+ when the Krebs cycle is stopped by arsenic.

Pyruvate would increase, NADH would decrease, and intermembrane H+ would decrease as well.

Explanation:

Pyruvate - Pyruvate was still made through Glycolysis, and it is not used in the Krebs Cycle, so it increased.

NADH - NADH was not made by the Krebs Cycle, this causes it to decrease.

Intermembrane H+ - The Electron Transport Chain would not be able to have the electrons needed to move the H+ since it does not have NADH, causing it to decrease.