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Respiratory Quotient (RQ) is defined as:

  • A O2 absorbed / CO2 released
  • B CO2 released / O2 absorbed
  • C ATP produced / O2 absorbed
  • D Glucose used / CO2 released

Correct answer: B. CO2 released / O2 absorbed

Explanation: RQ = volume of CO2 released / volume of O2 absorbed. RQ=1 for carbohydrates, less than 1 for fats, greater than 1 for organic acids/proteins.

Concept context

Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.

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