The respiratory quotient of glucose, the ratio of carbon dioxide produced to oxygen consumed, is
Correct answer: A. 1.0
- A. 1.0
- B. 0.7
- C. 0.5
- D. 1.4
Explanation
For glucose, six CO2 are released and six O2 consumed, so the quotient is exactly one. Fats give about 0.7 because they need proportionally more oxygen for their hydrogen-rich chains, which is how physiologists guess which food is being burnt.
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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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