For 10 points, following glycolysis and preceding the electron transport chain, this is what cycle of cellular respiration.
An FADH2 molecule is created when succinate is transformed into fumarate during this process. It follows a process involving enolase and hexokinase. It also produces one GTP, two CO2 and three NADH. It starts when oxaloacetate reacts with acetyl-CoA which is derived from pyruvic acid. That step produces citrate which is why this is also known as the citric acid cycle. For 10 points, following glycolysis and preceding the electron transport chain, this is what cycle of cellular respiration.
An FADH2 molecule is created when succinate is transformed into fumarate during this process.
{Krebs} Cycle [accept {citric acid cycle} before mentioned]