Anaerobic breakdown of glucose by yeast yields
Correct answer: B. ethanol and carbon dioxide
- A. lactic acid and a large quantity of ATP
- B. ethanol and carbon dioxide
- C. acetyl CoA and water
- D. pyruvic acid and oxygen
Explanation
Yeast decarboxylates pyruvate to ethanal and then reduces it to ethanol, releasing carbon dioxide, which is the basis of both brewing and the rising of bread dough. Lactic acid is the anaerobic product in mammalian muscle instead, and no extra ATP is made in either case beyond the two from glycolysis. Oxygen is neither used nor produced.
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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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