Question

Q28). Why is the energy yield from glycolysis higher during oxidative respiration than during anaerobic metabolism?

A) Because pyruvate is fully oxidized during oxidative respiration, but not during anaerobic metabolism.

B) Because NADH has more energy than FADH2.

C) Because lactic acid much less energy than pyruvate.

D) none of the other answers are correct

Answer 1

The energy yield from glycolysis is higher during oxidative respiration than during anaerobic metabolism due to pyruvate being fully oxidized during oxidative respiration, the higher energy of NADH compared to FADH2, and the lower energy of lactic acid compared to pyruvate.

Step-by-step explanation:

The energy yield from glycolysis is higher during oxidative respiration than during anaerobic metabolism for several reasons.

• Firstly, during oxidative respiration, pyruvate is fully oxidized in the mitochondria, whereas in anaerobic metabolism, pyruvate is converted to lactic acid or alcohol, resulting in a lower energy yield.
• Secondly, NADH, which is produced as a result of glycolysis, has more energy than FADH2, which is produced during fermentation. NADH plays a crucial role in the production of ATP through oxidative phosphorylation in the electron transport chain.
• Lastly, lactic acid has much less energy than pyruvate. In anaerobic metabolism, pyruvate is converted to lactic acid, resulting in a lower energy yield compared to the complete oxidation of pyruvate during oxidative respiration.