Nickel contributes to the formation of one of the following

Options

A. urease
B. dehydrogenase
C. rubisco protein
D. nitrate reductase

Explanation

To solve the question "Nickel contributes to the formation of one of the following," we need to identify which enzyme among the given options contains nickel as a component. The options provided are:

1. Urease
2. Dehydrogenase
3. Rubiscoprotein
4. Nitrate reductase

### Step-by-Step Solution:

**Step 1: Analyze each option**
- **Urease**: This enzyme catalyzes the hydrolysis of urea into carbon dioxide and ammonia. It is known to contain nickel as a cofactor.
- **Dehydrogenase**: This enzyme typically contains zinc as a cofactor, not nickel.
- **Rubiscoprotein**: This enzyme, involved in the Calvin cycle, does not contain nickel.
- **Nitrate reductase**: This enzyme is known to contain vanadium, not nickel.

**Step 2: Identify the correct answer**
Since urease is the only enzyme listed that is known to contain nickel, we can conclude that the correct answer is:

**Answer: Urease (Option A)**