MCAT Biochemistry Question 177: Answer and Explanation
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Question: 177
12. A respiratory quotient approaching 0.7 indicates metabolism primarily of which macromolecule?
- A. Carbohydrates
- B. Lipids
- C. Nucleic acids
- D. Amino acids
Correct Answer: B
Explanation:
The respiratory quotient (RQ) gives an indication of the primary fuel being utilized. An RQ around 0.7 indicates lipid metabolism, 0.8–0.9 indicates amino acid metabolism, choice (C), and 1.0 indicates carbohydrate metabolism, choice (A). Nucleic acids do not contribute significantly to the respiratory quotient.