Find the value of RQ when fats (E.g. Tripalmitin) are used in respiration.

Answer

To find the value of RQ (Respiratory Quotient) when fats, such as Tripalmitin, are used in respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of RQ**:
- The Respiratory Quotient (RQ) is defined as the ratio of the volume of carbon dioxide (CO2) produced to the volume of oxygen (O2) consumed during respiration.
- Mathematically, it is expressed as:
\[ RQ = \frac{\text{Volume of CO2 evolved}}{\text{Volume of O2 consumed}} \]

2. **Identify the Type of Respiratory Substrate**:
- In this case, the substrate used for respiration is fat, specifically Tripalmitin (a type of triglyceride).

3. **Know the RQ Values for Different Substrates**:
- Different substrates have different RQ values:
- Carbohydrates: RQ = 1
- Fats: RQ = 0.7
- Proteins: RQ = 0.8
- Organic acids: RQ > 1

4. **Determine the RQ for Fats**:
- Since the question specifies that fats are being used in respiration, we refer to the known RQ value for fats.
- The RQ value for fats, including Tripalmitin, is 0.7.

5. **Conclusion**:
- Therefore, the RQ value when fats are used in respiration is:
\[ \text{RQ} = 0.7 \]

### Final Answer:
The value of RQ when fats (e.g., Tripalmitin) are used in respiration is **0.7**.