Select incorrect match w.r.t activator element:

Options

A. `Mg^(++)` - RuBisCO
B. `Zn^(++)` - Alcoholic dehydraogenase
C. Mo - Nitrite reductase
D. Fe - Catalase

Answer

To solve the question "Select incorrect match with respect to activator element," we will analyze each option provided and determine which one does not correctly match an activator element with its corresponding enzyme.

### Step-by-Step Solution:

1. **Understand Activator Elements**: Activator elements are essential for the activation of certain enzymes. They play a crucial role in enzymatic reactions, either by activating or inhibiting them.

2. **Evaluate Each Option**:
- **Option 1: Magnesium (Mg²⁺) with Rubisco**: Magnesium is known to be an activator for Rubisco (ribulose bisphosphate carboxylase/oxygenase) and also for PEP carboxylase. This match is **correct**.

- **Option 2: Zinc (Zn²⁺) with Alcohol Dehydrogenase**: Zinc is indeed an activator for alcohol dehydrogenase. This match is also **correct**.

- **Option 3: Molybdenum with Nitrogenase**: Molybdenum is an activator for nitrogenase, which is involved in nitrogen metabolism. This match is **correct**.

- **Option 4: Iron with Catalase**: Iron acts as an activator for catalase, an enzyme that catalyzes the decomposition of hydrogen peroxide. This match is **correct**.

3. **Identify the Incorrect Match**: Based on the evaluation:
- All options provided are correct matches except for the one that is not explicitly mentioned in the video transcript. The incorrect match is **Molybdenum with Nitrate Reductase** as Molybdenum is actually the activator for Nitrogenase, not Nitrate Reductase.

4. **Conclusion**: The incorrect match with respect to the activator element is **Molybdenum with Nitrate Reductase**.

### Final Answer:
The incorrect match is **Molybdenum with Nitrate Reductase**.