In which of the following reactions of glycolysis, oxidation takes place?
Correct answer: B. Glyceraldehyde 3 - phosphate to 1, 3 - bisphosphoglycerate
- A. Glucose 6-PO4 to fructose 6-PO4
- B. Glyceraldehyde 3 - phosphate to 1, 3 - bisphosphoglycerate
- C. 1. 3 - bisphosphoglycerate to 3 - phosphoglycerate
- D. 2 - phosphoglycerate to phosphoenol pyruvate
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.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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