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R.Q. is

1. CAN
2. N/C
3. CO₂/O₂
4. O₂/CO₂

Correct answer: CO₂/O₂

Solution

Respiratory quotient (RQ) is defined as the amount of CO₂ produced divided by the amount of O₂ consumed. For carbohydrate metabolism, this ratio is 1, which corresponds to CO₂/O₂.

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