Which of the following statements is incorrect?

Options

A. Enzymes exist in colloidal state
B. Enzymes are catalysts
C. Enzymes can catalyse any reaction
D. Urease in an enzyme

Answer

To determine which statement is incorrect regarding enzymes, we will analyze each statement provided in the options.

### Step-by-step Solution:

1. **Understanding Enzymes**:
- Enzymes are biological catalysts that increase the rate of chemical reactions in living organisms. They are primarily proteins and are highly specific in their action.

2. **Analyzing the Statements**:
- **Statement 1**: "Enzymes exist in colloidal state."
- Enzymes are indeed macromolecules that can exist in a colloidal state, which means they are not completely soluble in water. This statement is correct.

- **Statement 2**: "Enzymes are catalysts."
- Enzymes function as catalysts, meaning they speed up biochemical reactions without being consumed in the process. This statement is also correct.

- **Statement 3**: "Enzymes can catalyze any reaction."
- This statement is incorrect. Enzymes are specific to certain substrates and cannot catalyze every possible reaction. Each enzyme is tailored to facilitate a specific reaction or a group of related reactions.

- **Statement 4**: "Urease is an enzyme."
- Urease is indeed an enzyme that catalyzes the hydrolysis of urea into ammonia and carbon dioxide. This statement is correct.

3. **Conclusion**:
- Based on the analysis, the incorrect statement is **Statement 3**: "Enzymes can catalyze any reaction."

### Final Answer:
The incorrect statement is: **"Enzymes can catalyze any reaction."**

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