Which of the following source of enzyme and the substrate are correctly matched

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 intestine"-"Starch" overset(alpha- "amylase")rarr "Disaccharide (Maltose)"`

Answer

To solve the question of which source of enzyme and substrate are correctly matched, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Option 1: Small intestine, proteins, enzyme: pepsin**
- Pepsin is an enzyme that digests proteins, but it is secreted by the stomach, not the small intestine. Therefore, this option is incorrect.

2. **Option 2: Stomach, fats, enzyme: lipase**
- The stomach does produce gastric lipase, but its role in fat digestion is minimal compared to pancreatic lipase, which is more significant in the small intestine. Thus, this option is also incorrect.

3. **Option 3: Duodenum, triglycerides, enzyme: trypsin**
- Trypsin is an enzyme that digests proteins, and it is secreted by the pancreas, not the duodenum. The duodenum does not secrete trypsin; it activates trypsinogen from the pancreas. Therefore, this option is incorrect.

4. **Option 4: Small intestine, starch, enzyme: alpha-amylase**
- Alpha-amylase is an enzyme that digests starch into maltose and is secreted by the pancreas. The small intestine is indeed where starch is further digested into maltose by alpha-amylase. This option is correct.

### Conclusion:
The correct answer is **Option 4: Small intestine, starch, enzyme: alpha-amylase**.

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