Mitochondria and Oxidative Phosphorylation Controlled oxidation of sugars Breaks down sugar in a number of small stepwise events = more efficient NADH and FADH2 carry energy in the form of high energy electrons Produce these molecules as a way to transport high energy electrons (Energy is stored as redox potential) These electrons will be transferred to the electron transport chain Glycolysis occurs in a stepwise process NADH is an energy carrier (energy will be harvested later) Some ATP is produced directly Most of the energy is still stored in pyruvate molecules Citric acid/tricarboxylic acid/Krebs cycle Oxidize pyruvate Yield for every 2 molecules of acetyl CoA: 2 GTP + 2 FADH2 + 6 NADH + 4 CO2