The Krebs cycle summarizes a circular series of reactions in the mitochondria to metabolize AcCoA to two molecules of CO2 with resultant generation of one molecule of GTP, three molecules of NADH, and one molecule of FADH2. GTP is equivalent to ATP in terms of energy charge.
For one cycle, two molecules of carbon, three molecules of NADH, one molecule of FADH2 and one molecule of ATP or GTP are produced. Each glucose molecule produces two molecules of acetyl CoA, enough for two cycles.
If you would like to go into a little more depth, technically ADP/ATP are not even involved in the Krebs cycle at all. There is another energy molecule that is just about energetically equivalent to ADP/ATP. It is GDP/GTP. So the Krebs cycle actually produces GTP.
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