Nitrate reductase enzyme is a metallo-flavoprotein and contains ………………………………….

Explanation

**Step-by-Step Solution:**

1. **Understanding Nitrate Reductase**: Begin by defining what nitrate reductase is. Nitrate reductase is an enzyme that plays a crucial role in the process of nitrate assimilation in plants. It catalyzes the reduction of nitrate (NO3-) to nitrite (NO2-).

2. **Function of Nitrate Reductase**: Explain the function of this enzyme. Nitrate reductase facilitates the conversion of nitrate to nitrite by reducing one oxygen atom from the nitrate molecule.

3. **Cofactors Required**: Identify the cofactors required for the enzyme's activity. Nitrate reductase is classified as a metallo-flavoprotein, which means it contains both metal ions and flavin components.

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