Which one of the following is the correct mathcing of the site of action on the given substrate, the enzyme acting upon it and the end producrt?

Options

A. Small intestine: Proteins `overset("Pepsin")rarr` Amino acids
B. Stomach : Fats `overset("Lipase")rarr`Micelles
C. Duodenum: Triglycerides `overset("Trypsin")rarr` Monoglycerides
D. Small intenstine: Starch `overset("a-analyase")rarr` Disaccharide (maltose)

Explanation

To solve the question regarding the correct matching of the site of action, substrate, enzyme, and end product, we need to analyze each option provided.

### Step-by-Step Solution:

1. **Option A: Small intestine, Protein, Pepsin → Amino Acids**
- **Analysis**: Pepsin is an enzyme that acts on proteins, but it is secreted in the stomach, not the small intestine. Additionally, pepsin breaks down proteins into smaller peptides, not directly into amino acids. The final breakdown into amino acids occurs in the small intestine by other enzymes such as trypsin.
- **Conclusion**: This option is incorrect.

2. **Option B: Stomach, Fats, Lipase → Micelles**
- **Analysis**: Lipase is indeed an enzyme that acts on fats, but it primarily works in the small intestine where emulsified fats are present. In the stomach, the action of lipase is minimal, and the formation of micelles occurs in the small intestine after the action of bile salts.
- **Conclusion**: This option is incorrect.

3. **Option C: Duodenum, Triglycerides, Trypsin → Monoglycerides**
- **Analysis**: Trypsin is a proteolytic enzyme that acts on proteins, not triglycerides. It is involved in protein digestion and does not convert triglycerides into monoglycerides. The correct enzyme for triglyceride digestion is lipase, which acts in the small intestine.
- **Conclusion**: This option is incorrect.

4. **Option D: Small intestine, Starch, Alpha Amylase → Disaccharide (Maltose)**
- **Analysis**: Alpha amylase is an enzyme that acts on starch and is secreted by the pancreas into the small intestine. It breaks down starch into disaccharides, including maltose. This matches the site of action, substrate, enzyme, and end product correctly.
- **Conclusion**: This option is correct.

### Final Answer:
The correct matching is **Option D: Small intestine, Starch, Alpha Amylase → Disaccharide (Maltose)**.

---