`CO_(2)` acceptor and carboxylating exzyme in C3 plants are , respectively,

Options

A. PEP, PEPCO
B. RuBP, RuBisCO
C. OAA, RuBisCO
D. 3 PGA, RuBisCO

Answer

To answer the question about the CO₂ acceptor and carboxylating enzyme in C3 plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the CO₂ Acceptor in C3 Plants**:
- In C3 plants, the primary acceptor of carbon dioxide (CO₂) during the process of photosynthesis is Ribulose bisphosphate (RuBP). This molecule plays a crucial role in the Calvin cycle.

2. **Identify the Carboxylating Enzyme**:
- The enzyme responsible for catalyzing the reaction where CO₂ is fixed to RuBP is known as Ribulose bisphosphate carboxylase/oxygenase, commonly abbreviated as RuBisCO. This enzyme facilitates the carboxylation process, leading to the formation of 3-phosphoglycerate (3-PGA).

3. **Combine the Information**:
- Therefore, the CO₂ acceptor in C3 plants is RuBP, and the carboxylating enzyme is RuBisCO.

4. **Select the Correct Option**:
- Based on the information gathered, the correct answer to the question is RuBP (Ribulose bisphosphate) and RuBisCO (Ribulose bisphosphate carboxylase/oxygenase).

### Final Answer:
The CO₂ acceptor and carboxylating enzyme in C3 plants are RuBP and RuBisCO, respectively.

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