The organelle where glycine is formed during photorespiration is

Options

A. chloroplast
B. mitochondrion
C. peroxisome
D. glyoxysome

Answer

To answer the question about the organelle where glycine is formed during photorespiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photorespiration**:
- Photorespiration is a process that occurs in C3 plants when the concentration of carbon dioxide (CO2) is low and the concentration of oxygen (O2) is high. This process competes with the Calvin cycle (C3 cycle) and is considered an energy-wasting process.

**Hint**: Remember that photorespiration occurs in conditions where CO2 is low and O2 is high.

2. **Role of Rubisco**:
- The enzyme Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) plays a crucial role in photorespiration. Instead of fixing CO2, it can react with O2, leading to the formation of glycolate.

**Hint**: Rubisco can act on both CO2 and O2, but in photorespiration, it primarily reacts with O2.

3. **Formation of Glycolate**:
- In the chloroplast, the reaction catalyzed by Rubisco leads to the production of glycolate from ribulose bisphosphate (RuBP).

**Hint**: Glycolate is the first product formed in the chloroplast during photorespiration.

4. **Conversion of Glycolate to Glycine**:
- The glycolate produced in the chloroplast is then transported to the peroxisome, where it is converted into glycine.

**Hint**: The conversion of glycolate to glycine occurs in the peroxisome.

5. **Final Answer**:
- Therefore, the organelle where glycine is formed during photorespiration is the **peroxisome**.

### Summary:
The organelle where glycine is formed during photorespiration is the **peroxisome**.