Answer: 0.7.
- A 1.0
- B 0.7
- C 1.3
- D 0.5
Correct answer: B. 0.7
Explanation: RQ for fats is about 0.7 (less O<sub>2</sub> released relative to CO<sub>2</sub> consumed). RQ for carbohydrates = 1.0, proteins ~0.8, organic acids > 1.
As substrate concentration rises, reaction rate increases steeply at first, then plateaus at Vmax once every enzyme molecule is working at full capacity; Km is the substrate concentration giving half-maximal rate, and a LOWER Km means the enzyme reaches that rate with less substrate (higher affinity).
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.