Which of the following statements is not correct

Options

A. All enzymes are proteins
B. All enzymes are biocatalysts
C. All proteins are enzymes
D. All enzymes are thermolabile

Explanation

To determine which statement is not correct regarding enzymes and proteins, we will analyze each statement provided:

1. **All enzymes are proteins.**
- This statement is correct. Most enzymes are indeed proteins that act as biological catalysts to speed up chemical reactions in living organisms.

2. **All enzymes are bio-catalysts.**
- This statement is also correct. Enzymes function as bio-catalysts, meaning they facilitate biological reactions without being consumed in the process.

3. **All proteins are enzymes.**
- This statement is incorrect. While many enzymes are proteins, not all proteins function as enzymes. For example, structural proteins (like collagen) and transport proteins (like hemoglobin) do not catalyze reactions.

4. **All enzymes are thermolabile.**
- This statement is correct. Enzymes are generally sensitive to heat and can denature (lose their functional shape) at high temperatures.

Based on the analysis, the statement that is not correct is **"All proteins are enzymes."**

### Step-by-Step Solution:
1. **Identify the statements provided.**
- List the statements about enzymes and proteins.

2. **Evaluate each statement for correctness.**
- Analyze if each statement aligns with biological principles regarding enzymes and proteins.

3. **Determine which statement is incorrect.**
- Identify the statement that does not hold true based on the analysis.

4. **Conclude with the correct answer.**
- State that the incorrect statement is "All proteins are enzymes."