Question

Maximum number of ATP can be generated during

• A. Oxidation of $NADH$ formed during glycolysis
• B. Substrate level phosphorylation
• C. Oxidation of $FAD{H}_2$
• D. Oxidation of coenzymes formed during TCA cycle

Answer 1

The correct option is D Oxidation of coenzymes formed during TCA cycle

There are 2 $NADH$ molecules formed per glucose molecule during glycolysis. The oxidation of each $NADH$ molecule through the electron transport chain (ETC) results in the formation of 3 ATP molecules. Oxidation of one $FAD{H}_2$ molecules results in the formation of 2 ATP molecules. In the TCA cycle, 6 $NADH$ molecules and 2 $FAD{H}_2$ molecules are formed per glucose molecule, which result in the formation of $6\times 3+2\times 2=22$ ATP molecules.