Reducing agent for `CO_(2)` fixation in bacterial photosynthesis is

Options

A. `NADH_(2)`
B. `NADPH_(2)`
C. `FMNH_(2)`
D. All of these

Answer

To solve the question regarding the reducing agent for CO2 fixation in bacterial photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of CO2 Fixation**:
- CO2 fixation, also known as carbon dioxide assimilation, is the process by which inorganic carbon (CO2) is converted into organic compounds. This is crucial for energy storage and as building blocks for various biological molecules.

2. **Identify the Context of Bacterial Photosynthesis**:
- In bacterial photosynthesis, CO2 fixation occurs similarly to higher plants but may utilize different reducing agents.

3. **List the Options Provided**:
- The options given are:
- A) NADH2
- B) NADPH2
- C) FMNH2
- D) All of these

4. **Determine the Role of Each Option**:
- **NADH2**: This is a common reducing agent in various biological processes, including some forms of photosynthesis.
- **NADPH2**: This is typically the reducing agent used in the Calvin cycle of photosynthesis in plants and some bacteria.
- **FMNH2**: This is another reducing agent that can be involved in certain biochemical reactions.

5. **Identify the Correct Reducing Agent**:
- In the context of bacterial photosynthesis, the primary reducing agent for CO2 fixation is NADPH2. This is because NADPH2 is specifically involved in the reduction reactions necessary for converting CO2 into organic compounds.

6. **Select the Correct Answer**:
- Based on the analysis, the correct answer to the question is **NADPH2**.

### Final Answer:
The reducing agent for CO2 fixation in bacterial photosynthesis is **NADPH2**.