The two enzymatic activities associated with RUBISCO are

Options

A. oxidase and oxygenase
B. oxygenase and carboxylase
C. oxidase and carboxylase
D. oxygenase and carbamylation

Answer

To answer the question regarding the two enzymatic activities associated with RUBISCO, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding RUBISCO**:
- RUBISCO, or Ribulose-1,5-bisphosphate carboxylase/oxygenase, is a crucial enzyme in the process of photosynthesis found in plants.

2. **Identifying the Two Activities**:
- RUBISCO has two primary enzymatic activities:
- **Carboxylase Activity**
- **Oxygenase Activity**

3. **Explaining Carboxylase Activity**:
- In carboxylase activity, RUBISCO catalyzes the reaction between Ribulose-1,5-bisphosphate (RuBP) and carbon dioxide (CO2) in the presence of water.
- This reaction produces 3-phosphoglyceraldehyde (3-PGA), which is a key intermediate in the Calvin cycle of photosynthesis.

4. **Explaining Oxygenase Activity**:
- In oxygenase activity, RUBISCO catalyzes the reaction between RuBP and oxygen (O2).
- This reaction leads to the formation of phosphoglyceric aldehyde and phosphoglycolate, which can lead to photorespiration, a less efficient pathway compared to the carboxylation process.

5. **Conclusion**:
- Therefore, the two enzymatic activities associated with RUBISCO are:
- **Carboxylase Activity**
- **Oxygenase Activity**

### Final Answer:
The two enzymatic activities associated with RUBISCO are **Carboxylase Activity** and **Oxygenase Activity**.

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