At which step oxygen is used in peroxisome ?

Options

A. Glycolate of glyoxylate
B. Glyoxylate of glycine
C. Glycine to serine
D. Serine to hydroxy pyruvate

Answer

### Step-by-Step Solution:

1. **Understanding Photorespiration**:
- Photorespiration is a process that occurs in plants, primarily when the concentration of oxygen is high and carbon dioxide is low. It is not a typical or efficient process for photosynthesis but is a part of the plant's metabolism.

2. **Identifying Key Organelles**:
- During photorespiration, three organelles are involved: chloroplasts, mitochondria, and peroxisomes. Each plays a specific role in the conversion of substrates.

3. **Role of Peroxisomes**:
- The peroxisome is an organelle that is crucial for the conversion of glycolate, which is produced in the chloroplast, into glyoxylate.

4. **Oxygen Utilization**:
- In the peroxisome, oxygen is specifically used to convert glycolate into glyoxylate. This step is essential in the photorespiration pathway.

5. **Final Conversion**:
- After the conversion of glycolate to glyoxylate in the peroxisome, glyoxylate is further converted into glycine, which is an amino acid.

6. **Conclusion**:
- Therefore, the step at which oxygen is used in the peroxisome is during the conversion of glycolate to glyoxylate in the process of photorespiration.