Which of the following enzyme works at a pH of 1.6 in stomach and digests proteins?

Options

A. Trypsin
B. Amylase
C. Erepsin
D. Pepsin

Answer

To solve the question of which enzyme works at a pH of 1.6 in the stomach and digests proteins, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Enzymes**: The question provides a list of enzymes: trypsin, amylase, erypsin, and pepsin. We need to analyze each one to determine their function and optimal pH.

2. **Understand the pH of the Stomach**: The stomach has a highly acidic environment with a pH around 1.6 to 3.5. Therefore, we need to find an enzyme that is active in this acidic range.

3. **Analyze Each Enzyme**:
- **Trypsin**: This enzyme is produced in the pancreas and works best at a neutral to slightly alkaline pH (around 7.5 to 8.5). It is not suitable for the acidic environment of the stomach.
- **Amylase**: This enzyme is responsible for starch digestion and works best at a neutral pH (around 6.7 to 7). It is primarily active in the mouth and small intestine, not in the stomach.
- **Erypsin**: This is a less commonly known enzyme, but it is similar to trypsin and also functions in the small intestine at a neutral pH.
- **Pepsin**: This enzyme is secreted by the stomach lining and is specifically adapted to function in the acidic environment of the stomach. It works effectively at a pH of around 1.6 and is responsible for protein digestion.

4. **Conclusion**: Based on the analysis, the enzyme that works at a pH of 1.6 in the stomach and digests proteins is **pepsin**.

### Final Answer:
The enzyme that works at a pH of 1.6 in the stomach and digests proteins is **pepsin**.

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