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How Many molecules of ATP can be obtained from one molecule of Pyruvic acid during aerobic respiration ?

How Many molecules of ATP can be obtained from one molecule of Pyruvic acid during aerobic respiration ? Correct Answer 15

The correct answer is 15.

Explanation:

Aerobic respiration:

  • Aerobic respiration is the next step after glycolysis that leads to the complete oxidation of organic substances.
  • It occurs in the presence of oxygen.
  • The end product of glycolysis (it is the first step of respiration which occurs without requirement of oxygen) is pyruvic acid.
  • In the oxidative decarboxylation and Krebs cycle, one molecule of pyruvate produces four molecules of NADH, one molecule of FADH2, and one molecule of ATP.
  • Furthermore, by oxidation in the electron transport system (ETS), 1 molecule of FADH2 and 4 molecules of NADH produce 2 and 12 (4 x 3 = 12) ATP molecules, respectively.
  • As a result, the total number of ATP molecules produced by 1 pyruvic acid molecule during the aerobic respiration  = 12+2+1 = 15.

Thus, 15 molecules of ATP can be obtained from one Molecule of Pyruvic acid during aerobic respiration.

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