Following glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, the carbo
n skeleton of glucose has been broken down to CO2 with some net gain of ATP. Most of the energy from the original glucose molecule at that point in the process, however, is stored in the form of which of the following molecules? (A) NADH
(B) glucose
(C) pyruvate
(D) acetyl-CoA
Explanation: Glycolysis is a catabolic reaction that is made of many steps that breaks down food to give off energy in a form of ATP. Pyruvate the product of glycolysis, is converted to Acetyl-coA using enzyme pryruvate dehydrogenase. During this process between krebs cycle and oxidative phosphorylation NAD takens electron (reduction) and turns to NADH(oxidation) which travels to the mitochondria, our power house, where its converted to energy using redox reactions. To sum up, energy from glucose molecules are transported and exist in forms of NAD to NADH.
