How many atp are made in the electron transport part of cellular respiration

34

Explanation:

The electron transport chain of cellular respiration includes oxidation of NADH and FADH2. The electrons from these reducing powers are passed to the terminal electron acceptor via electron transport chain. During the transfer of electron via electron transport chain, the generated electrochemical gradient drives ATP synthesis.

The net yield of NADH from glycolysis and Kreb's cycle is 2 and 6 per glucose molecule respectively. In addition, decarboxylation of pyruvate also obtains 2 NADH per glucose. Kreb's cycle forms 2 FADH2 molecules during reduction reactions. In total, 10 NADH and 2 FADH2 are formed which then enter the electron transport chain and drive ATP synthesis.

One molecule of NADH generates the electrochemical gradient enough to drive the synthesis of 3 molecules of ATP while each FADH2 obtains 2 ATP molecules. Therefore, total 10 x 3 = 30 ATP molecules from oxidation of NADH and 2 x 2 = 4 ATP from oxidation of FADH2 are obtained.