In this enzyme is absent in our small intestine, digestion of proteins in our body would be severly affected identify the enzyme.

Options

A. Pancreatic amylase
B. Maltase
C. Lipase
D. Enterokinase

Explanation

To solve the question regarding which enzyme's absence in the small intestine would severely affect protein digestion, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Enzymes**:
- Enzymes are biological catalysts that facilitate various biochemical reactions, including digestion. Each enzyme has a specific substrate it acts upon.

2. **Analyze the Given Options**:
- The options provided are:
- Pancreatic Amylase
- Maltase
- Lipase
- Enterokinase

3. **Evaluate Each Enzyme**:
- **Pancreatic Amylase**: This enzyme is involved in carbohydrate digestion, breaking down starch into sugars. It does not play a role in protein digestion.
- **Maltase**: This enzyme acts on maltose, converting it into glucose. Again, it is not involved in protein digestion.
- **Lipase**: This enzyme digests lipids (fats) into fatty acids and glycerol. It does not affect protein digestion.
- **Enterokinase**: This enzyme is crucial for protein digestion as it activates trypsinogen (an inactive enzyme) into trypsin, which then activates other proteolytic enzymes (chymotrypsinogen and procarboxypeptidase) that are essential for breaking down proteins.

4. **Identify the Key Enzyme**:
- Since enterokinase is responsible for activating trypsin and subsequently other proteolytic enzymes, its absence would prevent the digestion of proteins. Without these active enzymes, proteins cannot be effectively broken down into amino acids.

5. **Conclusion**:
- Therefore, the enzyme that, if absent in the small intestine, would severely affect protein digestion is **Enterokinase**.

### Final Answer:
**Enterokinase**