An ion which is the component of hydrogenase and ureae enzyme and also helpful mobilization of nitrogen

Options

A. `Ni^(+)`
B. `Zn^(++)`
C. `Cu^(++)`
D. `Mg^(++)`

Answer

To answer the question, we need to identify the ion that is a component of the enzymes hydrogenase and urease, and is also involved in the mobilization of nitrogen.

### Step-by-Step Solution:

1. **Identify the Enzymes**: The question mentions two specific enzymes: hydrogenase and urease.
- Hydrogenase is involved in the reduction of protons to hydrogen gas.
- Urease catalyzes the hydrolysis of urea into ammonia and carbon dioxide.

2. **Determine the Role of the Ion**: The ion in question must be a component of both enzymes and play a role in nitrogen mobilization.

3. **Consider the Possible Ions**: The options provided in the transcript include nickel, zinc, copper, and magnesium.
- Among these, we need to identify which one is specifically known to be a component of hydrogenase and urease.

4. **Research the Ions**:
- Nickel (Ni) is known to be a crucial component of urease and is also involved in nitrogen metabolism.
- Zinc (Zn) and copper (Cu) are important for various enzymes but are not specifically known for hydrogenase or urease.
- Magnesium (Mg) is a macronutrient and is not specifically a component of these enzymes.

5. **Conclusion**: Based on the information gathered, the ion that is a component of both hydrogenase and urease and aids in nitrogen mobilization is **Nickel (Ni)**.

### Final Answer:
The ion which is the component of hydrogenase and urease enzymes and also helpful in the mobilization of nitrogen is **Nickel (Ni)**.

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