Question

The number of ATP molecules produced from one Krebs cycle is

• A. 15
• B. 30
• C. 38
• D. 40

Answer 1

The correct option is A 15

Total number of ATP produced during the breakdown of one acetyl-CoA is 12.

The Krebs cycle starts with acetyl-CoA, whereas pyruvic acid is the end product of glycolysis. When one molecule of pyruvic acid is converted to acetyl coA there is the synthesis of one molecule of reduced coenzyme $NAD{H}_2$, which yields 3 molecules of ATP during oxidation by mitochondrial electron transport system. Considering these 3 molecules of ATP, the total ATP synthesized by one turn of Krebs cycle is (12+3) i.e., 15 molecules of ATP.