What is equivalent to half a glucose molecule that has been oxidized to the extent of losing two electrons as hydrogen atoms?
Correct answer: A. G3P
- A. G3P
- B. Dihydroxyacetone phosphate
- C. 1,3-Bisphosphoglycerate
- D. Pyruvate
Explanation
Half a glucose molecule corresponds to a three-carbon unit. In glycolysis, when this unit loses two electrons as hydrogen atoms, it reduces NAD⁺ to NADH. The molecule that directly undergoes this oxidation is glyceraldehyde-3-phosphate. Pyruvate is formed later, and dihydroxyacetone phosphate is not directly oxidized. Therefore, the correct equivalent of half a glucose losing two electrons is glyceraldehyde-3-phosphate.
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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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