R.Q. for protein is

Options

A. 1.4
B. 0.5
C. 0.7-0.9
D. Unity.

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of RQ**: The respiratory quotient (RQ) is a measure used to determine the ratio of carbon dioxide (CO2) produced to oxygen (O2) consumed during respiration. It is calculated using the formula:
\[ RQ = \frac{\text{CO}_2 \text{ produced}}{\text{O}_2 \text{ consumed}} \]

2. **Identify the RQ Values for Different Substrates**: The RQ value varies depending on the type of substrate being metabolized. Common substrates include carbohydrates, fats, and proteins, each with distinct RQ values.

3. **Determine the RQ for Proteins**: For proteins, the RQ value typically ranges between 0.7 and 0.9. This range is due to the nitrogen content in proteins, which affects the amount of CO2 produced relative to O2 consumed.

4. **Conclusion**: Therefore, the RQ for protein is approximately between 0.7 and 0.9. This means that when proteins are metabolized, the ratio of CO2 produced to O2 consumed falls within this range.

5. **Final Answer**: The correct answer is that the RQ for protein is between 0.7 and 0.9.

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