Which of the following belong(s) to the family of enzymes?

Options

A. Lipase
B. Pepsin
C. Ptyalin
D. Cellulose

Explanation

To determine which of the given options belong to the family of enzymes, we will analyze each option one by one.

### Step 1: Understand what enzymes are
Enzymes are biological catalysts that speed up biochemical reactions in living organisms. They are typically proteins that facilitate various metabolic processes.

### Step 2: Analyze each option

1. **Lipase**:
- Lipase is an enzyme that catalyzes the breakdown of fats (lipids) into fatty acids and glycerol. It plays a crucial role in digestion, particularly in the intestines.
- **Conclusion**: Lipase is an enzyme.

2. **Pepsin**:
- Pepsin is another enzyme that is involved in the digestion of proteins. It breaks down proteins into smaller peptides in the acidic environment of the stomach.
- **Conclusion**: Pepsin is an enzyme.

3. **Toluene**:
- Toluene is not an enzyme; it is an aromatic hydrocarbon commonly used as a solvent in chemical reactions and industrial processes.
- **Conclusion**: Toluene is not an enzyme.

4. **Cellulose**:
- Cellulose is a polysaccharide that serves as a structural component in the cell walls of plants. It is not involved in catalyzing biochemical reactions.
- **Conclusion**: Cellulose is not an enzyme.

### Step 3: Summarize the findings
From the analysis:
- Lipase is an enzyme.
- Pepsin is an enzyme.
- Toluene is not an enzyme.
- Cellulose is not an enzyme.

### Final Answer
The options that belong to the family of enzymes are **Lipase and Pepsin**.