Enzyme pair common to both EMP and `C_(3)` cycle is

Options

A. Aldolase and enolase
B. Aldolase and triose phosphate isomerase
C. Phosphoglyceromutase and triose phosphate isomerase
D. Cytochrome oxidase and enolase.

Answer

To solve the question regarding the enzyme pair common to both the EMP (Embden-Meyerhof-Parnas) pathway, which is glycolysis, and the C3 cycle (Calvin cycle), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Pathways**:
- The EMP pathway, also known as glycolysis, is the process of breaking down glucose to extract energy.
- The C3 cycle, or Calvin cycle, is a part of photosynthesis where carbon dioxide is fixed into organic molecules.

2. **Identifying the Enzymes**:
- We need to identify the enzymes that are common to both pathways from the given options:
- **Option A**: Aldolase and Anolase
- **Option B**: Aldolase and Triose Phosphate Isomerase
- **Option C**: Phosphoglycerate Mutase and Triose Phosphate Isomerase
- **Option D**: Cytochrome Oxidase and Anolase

3. **Analyzing Each Option**:
- **Option A**: Aldolase is present in both glycolysis and the C3 cycle, but Anolase is only present in glycolysis. Thus, this option is incorrect.
- **Option B**: Aldolase is present in both pathways. Triose Phosphate Isomerase is also present in both glycolysis and the C3 cycle, catalyzing the conversion of glyceraldehyde 3-phosphate to dihydroxyacetone phosphate. This option is correct.
- **Option C**: Phosphoglycerate Mutase is present in glycolysis but not in the C3 cycle. Hence, this option is incorrect.
- **Option D**: Cytochrome Oxidase is involved in oxidative phosphorylation and is not part of either glycolysis or the C3 cycle. Therefore, this option is incorrect.

4. **Conclusion**:
- The correct answer is **Option B: Aldolase and Triose Phosphate Isomerase**, as both enzymes are common to both the EMP pathway and the C3 cycle.