In which of the following reactions of glycolysis, oxidation takes place?

Explanation

Oxidation is the loss of electrons by an atom or molecule. In glycolysis, there are two main reactions that involve oxidation:Phosphoglyceraldehyde oxidation: In this reaction, glyceraldehyde-3-phosphate is oxidized to 1,3-bisphosphoglycerate. This reaction is catalyzed by the enzyme glyceraldehyde-3-phosphate dehydrogenase. In the reaction, glyceraldehyde-3-phosphate loses a hydrogen atom, which is accepted by NAD+ to form NADH.Pyruvate oxidation: In this reaction, pyruvate is oxidized to acetyl-CoA. This reaction is catalyzed by the enzyme pyruvate dehydrogenase complex. In the reaction, pyruvate loses a carbon dioxide molecule and a hydrogen atom, which are accepted by NAD+ to form NADH and CO2.