Find out the organic molecule which has RQ equal to unity

Options

A. Protein
B. Fat
C. Carbohydrate
D. Malic acid

Answer

To solve the question of finding the organic molecule that has a respiratory quotient (RQ) equal to unity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Respiratory Quotient (RQ)**:
- The RQ is defined as the ratio of carbon dioxide produced to oxygen 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 Organic Molecules**:
- Different substrates used in respiration have different RQ values:
- **Carbohydrates**: RQ = 1
- **Fats**: RQ ≈ 0.7
- **Proteins**: RQ ≈ 0.8
- **Organic Acids (e.g., Malic Acid)**: RQ > 1 (specifically, malic acid has an RQ of approximately 1.33)

3. **Analyze the Given Options**:
- The options provided are:
- Proteins
- Fats
- Carbohydrates
- Malic Acids
- From the RQ values identified, we can see that:
- Carbohydrates have an RQ of 1, which matches the requirement of the question.
- Fats, proteins, and malic acids do not have an RQ equal to 1.

4. **Conclusion**:
- Based on the analysis, the organic molecule that has an RQ equal to unity is **Carbohydrates**.

### Final Answer:
The organic molecule which has RQ equal to unity is **Carbohydrates**.

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