Figure 43.
The ten NADH molecules made per glucose molecule during glycolysis, the transition phase, and the Krebs cycle carry enough energy to make 30 ATP molecules, while the 2 FADH2 molecules made in the process make an extra four ATP molecules. This is a theoretical yield of 34 molecules of ATP, except that there is leakage of electrons so the actual yield is less.
CITRIC ACID CYCLE There is a transition phase that occurs before glycolysis enters the Krebs cycle or the citric acid cycle. Pyruvate gets transported into the mitochondria in eukaryotes, where it gets turned into acetyl-CoA by removing carbon dioxide from it and adding coenzyme A. It delivers the acetyl group to the Krebs cycle. This “transition phase” makes a molecule of NADH in the process.
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