8. Select the correct sequence for the pathways of glucose catabolism A. glycoly

Question

8. Select the correct sequence for the pathways of glucose catabolism A. glycolysis-acetyl CoA->pyruv B. glycolysis-acctyl CoA-pyruvate oxidation->Krcbs cycle->electron transport chain C. glycolysis->pyruvate oxidation->acctyl CoA->clectron transport chain->Krebs cycle D. glycolysis->pyruvate oxidation->acctyl CoA-Krebs cycle-clectron transport chain E. glycolysis-chemiosmosis->acetyl CoA->clectron transport chain->Krebs cycle ate oxidation-electron transport chain->Krebs cycle

Explanation / Answer

Answer is D. Glycolysis --> Pyruvate oxidation --> Acetyl CoA --> Kreb's cycle --> Electron transport chain.

Explaination:

The glucose catabolism starts with glycolysis which is followed by pyruvate oxidation, acetyl CoA synthesis which enters then into Kreb's cycle and then the electron transport chain for the production of ATP molecules.

In glycolysis, one glucose molecule is break down into two molecules of pyruvic acid, 2 ATP and 2NADH molecules.

In pyruvate oxidation, the conversion of pyruvate to acetyl CoA occurs. Each pyruvate molecule loses one carbon atom with the release of carbon dioxide.

Acetyl CoA is an initiator of Kreb's cycle.

Each acetyl CoA proceeded through the Kreb's cycle. It produces 6 NADH2, 2FADH2, 4CO2 and 2ATP molecules.

Finally, at the mitochondrial inner membrane, electrons from NADH and FADH2 pass through the electron transport chain to oxygen which is reduced to water and 34 ATP molecules are produced by proton gradient.

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