5) Which of the following best describes how the citric acid cycle relates to gl

Question

5) Which of the following best describes how the citric acid cycle relates to glycolysis, oxidative phosphorylation, and chemiosmosis? Glycolysis produces pyruvate, which is converted to acetyl-CoA and enters the citric acid cycle. This cycle produces NADH and FADH2 which donate electrons to the electron transport chain to pump protons and produce ATP through chemiosmosis. Production of ATP using an electron transport chain and chemiosmosis is called oxidative phosphorylation. b The citric acid produces pyruvate, which converts to glucose to enter glycolysis. This pathway produces NADH and FADH2 , which enter oxidative phosphorylation to produce ATP through chemiosmosis. c Citric acid produces NADH and FADH2 , which undergo oxidative phosphorylation. This produces ATP by pumping protons through chemiosmosis. The ATP produced is utilized in large amount in the process of glycolysis. d Glycolysis produces pyruvate, which directly enters the citric acid cycle. This cycle produces the energy currency that undergoes the electron transport chain to produce water and ATP.

Explanation / Answer

Oxidative phosphorylation is the process of production of ATP from NADH2 and FADH which transfer electrons to oxygen in electron transport chain. This process occur in the inner membrane of mitochondria where ATP is produced by chemiosmosis method. NADH2 and FADH are produced during citric acid cycle which requires acetyl coA as substrate. This acetyl coA molecules are produced from pyruvate formed during glycolysis. So, the correct answer for this question is option a.

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