Multiple choice

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

  1. Electron transport chain

  2. Kreb’s cycle

  3. Glycolysis

  4. Conversion of pyruvic acid to acetyl CoA

  5. Oxidative phosphorylation
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A Correct answer
Explanation

The last step of aerobic respiration is the oxidation of reduced coenzymes, i.e. NADH2 and FADH2 by molecular oxygen through FAD, ubiquinone, cyt. f, cyt. c, cyt. c, cyt. a and cyt. ay. By oxidation of 1 molecule of NADH, 3 ATP molecules are produced and by oxidation of 1 molecule of FADH2, 2 ATP molecules are produced. So, the greatest number of ATP molecules are produced in the electron transport chain.

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