Enzyme involved in nitrogen fixation

Options

A. Nitrogenase
B. Nitrate reductase
C. Transferase
D. Transaminase

Answer

**Step-by-Step Solution:**

1. **Understanding Nitrogen Fixation**: Nitrogen fixation is the process by which atmospheric nitrogen (N₂) is converted into a form that plants can use, such as ammonia (NH₃). This process is crucial for the synthesis of amino acids and nucleotides, which are essential for life.

2. **Identifying the Enzymes**: The question provides four options: nitrogenous, nitrate reductase, transferase, and transaminase. We need to identify which of these enzymes is specifically involved in the nitrogen fixation process.

3. **Analyzing Each Option**:
- **Nitrogenous**: This enzyme is known to catalyze the conversion of dinitrogen (N₂) into ammonia (NH₃) during nitrogen fixation. Therefore, this is the correct answer.
- **Nitrate Reductase**: This enzyme is involved in the reduction of nitrate (NO₃⁻) to nitrite (NO₂⁻) and is not directly involved in nitrogen fixation. Thus, this option is incorrect.
- **Transferase**: This enzyme facilitates the transfer of functional groups between molecules but does not play a role in nitrogen fixation. Hence, this is also incorrect.
- **Transaminase**: This enzyme is involved in the transamination reactions that are crucial for amino acid synthesis but does not participate in nitrogen fixation. Therefore, this option is incorrect as well.

4. **Conclusion**: Based on the analysis, the enzyme involved in nitrogen fixation is **nitrogenous**.

**Final Answer**: The enzyme involved in nitrogen fixation is nitrogenous.

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