The `C_(2)` glycolate cycle is also known as

Options

A. PCR
B. PCO
C. PPP
D. EMP

Answer

To answer the question "The C2 glycolate cycle is also known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the C2 Glycolate Cycle**: The C2 glycolate cycle is also referred to as the photorespiration process in plants. It is called the C2 cycle because the primary product of this cycle is a two-carbon compound, glycolate.

2. **Identify Key Features of the Cycle**: In the C2 glycolate cycle, plants utilize oxygen and release carbon dioxide without producing ATP. This process occurs mainly when the concentration of oxygen is high and carbon dioxide is low, leading to a wasteful pathway.

3. **Recognize the Role of Enzymes**: The enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (commonly known as Rubisco) plays a crucial role in this cycle. It catalyzes the reaction between ribulose bisphosphate (RuBP) and oxygen, resulting in the formation of phosphoglycolate.

4. **Evaluate the Options**:
- **Option 1: PCR (Photosynthetic Carbon Reduction)**: This refers to the C3 cycle, not the C2 cycle.
- **Option 2: PCO (Photosynthetic Carbon Oxidation)**: This is another term for photorespiration and is relevant to the C2 cycle.
- **Option 3: PPP (Pentose Phosphate Pathway)**: This pathway is involved in the production of ribose-5-phosphate and is not related to the C2 cycle.
- **Option 4: EMP (Embden-Meyerhof-Parnas pathway)**: This is another name for glycolysis, which is not related to the C2 cycle.

5. **Select the Correct Answer**: Based on the evaluation, the C2 glycolate cycle is also known as **Photosynthetic Carbon Oxidation (PCO)**.

### Final Answer:
The C2 glycolate cycle is also known as **Photosynthetic Carbon Oxidation (PCO)**.

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