In glycolysis, during oxidation electrons are removed by:
Correct answer: D. NAD+
- A. Molecular oxygen
- B. ATP
- C. Glyceraldehyde-3-phosphate
- D. NAD+
Explanation
In glycolysis, NAD+ plays a crucial role as an electron carrier. During the oxidation of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate, electrons are transferred to NAD+, reducing it to NADH. This step is essential for continuing glycolysis as it helps in the extraction of energy from glucose. Molecular oxygen is not used in glycolysis; it is the terminal electron acceptor in the electron transport chain. ATP is generated rather than used for electron removal in glycolysis. Glyceraldehyde-3-phosphate, while undergoing oxidation, transfers electrons but is not the acceptor itself.
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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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