Transition Reaction converts the two molecules of the 3-carbon pyruvate from glycolysis into two molecules of the 2-carbon
molecule acetyl Coenzyme A (acetyl-CoA).
Transition Reaction is also called Oxidative
Decarboxylation. It takes place in the matrix of the mitochondria. It is the beginning of aerobic respiration, meaning this
phase will continue to take place as long as there is a sufficient amount of oxygen available in the mitochondria. If there
is not then the process of fermentation will begin.