The respiratory enzymes are located in

Options

A. Mitochondrial matrix
B. Perimtochondrial space
C. Cristae
D. Outer membrane

Answer

**Step-by-Step Solution:**

1. **Understanding Respiratory Enzymes:**
- Respiratory enzymes are crucial for cellular respiration, particularly in the Krebs cycle, which is a key part of the process that converts food into energy.

2. **Identifying the Location of Respiratory Enzymes:**
- The question asks where these enzymes are located. The main locations to consider are:
- Mitochondrial matrix
- Perimitochondrial space
- Cristae
- Outer membrane

3. **Analyzing Each Option:**
- **Mitochondrial Matrix:** This is where the Krebs cycle occurs, and thus, it contains the respiratory enzymes necessary for this process.
- **Perimitochondrial Space:** This is the space between the outer membrane and the inner membrane of the mitochondria, and it does not contain the respiratory enzymes.
- **Cristae:** These are the folds of the inner mitochondrial membrane, which increase surface area for electron transport but do not contain the Krebs cycle enzymes.
- **Outer Membrane:** This membrane surrounds the mitochondria and does not contain the respiratory enzymes either.

4. **Conclusion:**
- Based on the analysis, the correct answer is that the respiratory enzymes are located in the **mitochondrial matrix**.

**Final Answer:**
The respiratory enzymes are located in the mitochondrial matrix.

---