Glycolysis completes with the net gain of:
Correct answer: A. 2 ATP
- A. 2 ATP
- B. 3 ATP
- C. 4 ATP
- D. 32 ATP
Explanation
Glycolysis is the process of breaking down one molecule of glucose into two molecules of pyruvate. During this process, 4 ATP molecules are produced in total; however, 2 ATP molecules are consumed in the initial steps. Therefore, the net gain of ATP from glycolysis is 2 ATP. Option A is correct.Options B and C are incorrect as they do not account for the consumption of 2 ATP during the process. Option D is incorrect because it refers to the ATP yield from the complete oxidation of glucose during cellular respiration, including the Krebs cycle and oxidative phosphorylation, not just glycolysis.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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