In presence of high concentration of oxygen, `RuBP` carboxylase converts `RuBP` to

Options

A. Malic acid and `PEP`
B. `PGA` and `PEP`
C. `PGA` and malic acid
D. `PGA` and phosphoglycolate.

Answer

To solve the question "In the presence of high concentration of oxygen, RuBP carboxylase converts RuBP to," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding RuBP and Rubisco**:
- RuBP (Ribulose bisphosphate) is a 5-carbon sugar that plays a crucial role in the Calvin cycle of photosynthesis.
- The enzyme responsible for catalyzing the reaction involving RuBP is called RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase).

2. **Role of Oxygen**:
- In the presence of high concentrations of oxygen, RuBisCO can act as an oxygenase rather than a carboxylase.
- This means that instead of fixing carbon dioxide (CO2) to RuBP, it can bind oxygen to RuBP.

3. **Reaction Products**:
- When RuBisCO catalyzes the reaction with oxygen, RuBP is split into two different products:
- A 3-carbon compound known as PGA (3-phosphoglycerate).
- A 2-carbon compound known as phosphoglycolate.

4. **Identifying the Correct Option**:
- The question provides four options:
1. Malic acid and PEP
2. PGA and PP
3. PG and malic acid
4. PG and phosphoglycolate
- From our understanding, the correct products formed in the presence of high oxygen concentration are PGA and phosphoglycolate.

5. **Conclusion**:
- Therefore, the correct answer is that RuBP carboxylase converts RuBP to PGA and phosphoglycolate.

### Final Answer:
RuBP carboxylase converts RuBP to PGA and phosphoglycolate in the presence of high concentrations of oxygen.

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