Which of the following is the correct matchin of the site of action on the given substrate, the enzyme acting state upon it and the end product

Options

A. Small intestine - Proteins `rarr`Pepsin `rarr` Amino acids
B. Stomach-Fats `rarr` Lipase `rarr` Micelles
C. Duodenum - Triglycerides `rarr` Trypsin `rarr` Mono- glycerides
D. Small intestine - Starch `rarr alpha`-amylase `rarr` Disac- charide (Maltose)

Answer

To solve the question regarding the correct matching of the site of action, substrate, enzyme, and end product, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Options**: We have several options that provide a site of action, substrate, enzyme, and end product. We need to evaluate each one to determine if it is correct.

2. **Evaluate Option 1**:
- **Site of Action**: Small intestine
- **Substrate**: Protein
- **Enzyme**: Pepsin
- **End Product**: Not specified
- **Analysis**: Pepsin is an enzyme that is secreted in the stomach, not the small intestine. Therefore, this option is incorrect.

3. **Evaluate Option 2**:
- **Site of Action**: Stomach
- **Substrate**: Fat
- **Enzyme**: Lipase
- **End Product**: Micelle
- **Analysis**: Lipase does act on fats, but the end products of fat digestion are fatty acids and glycerol, not micelles. Thus, this option is also incorrect.

4. **Evaluate Option 3**:
- **Site of Action**: Duodenum (part of the small intestine)
- **Substrate**: Triglyceride
- **Enzyme**: Trypsin
- **End Product**: Not specified
- **Analysis**: Trypsin is an enzyme that digests proteins, not triglycerides. Therefore, this option is incorrect as well.

5. **Evaluate Option 4**:
- **Site of Action**: Small intestine
- **Substrate**: Starch
- **Enzyme**: Alpha amylase
- **End Product**: Disaccharide (maltose)
- **Analysis**: Alpha amylase is indeed an enzyme that acts in the small intestine to digest starch into disaccharides like maltose. This option is correct.

### Conclusion:
The correct match is:
- **Site of Action**: Small intestine
- **Substrate**: Starch
- **Enzyme**: Alpha amylase
- **End Product**: Disaccharide (maltose)

Thus, the fourth option is the correct answer.

---