Answer: A carbohydrate such as glucose.
- A A protein rich in nitrogen
- B A fat such as tripalmitin
- C A carbohydrate such as glucose
- D An organic acid such as oxalic acid
Correct answer: C. A carbohydrate such as glucose
Explanation: Carbohydrate respiration consumes O<sub>2</sub> and releases CO<sub>2</sub> in equal volumes, giving an RQ of 1, since carbohydrates already contain oxygen in the same ratio needed for complete oxidation.
Aerobic respiration unfolds in three locations: glycolysis in the cytoplasm yields a small amount of ATP directly, the Krebs cycle in the mitochondrial matrix harvests electron carriers (NADH, FADH2), and the electron transport chain in the inner mitochondrial membrane uses those carriers to generate the bulk of the ATP, with O2 needed only at this final stage.
Concept context
Glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. The cellular energy-release counterpart to photosynthesis.