A 1, 4, Glycosidic bonds are broken when

Options

A. Lipid is digested by lipase
B. Protein is digested by pepsin
C. Starch is digested by amylase
D. None of these

Explanation

To answer the question regarding when 1,4 glycosidic bonds are broken, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Glycosidic Bonds**:
- Glycosidic bonds are connections between sugar molecules (monosaccharides) that form disaccharides and polysaccharides. The "1,4" designation indicates the position of the carbon atoms involved in the bond formation.

2. **Identifying the Substances**:
- The question presents several options: lipids, proteins, starch, and none of these. We need to identify which of these contains 1,4 glycosidic bonds.

3. **Analyzing Starch**:
- Starch is a polysaccharide composed of glucose units linked by glycosidic bonds. It specifically contains 1,4 glycosidic bonds between the glucose molecules.

4. **Digestion of Starch**:
- The digestion of starch occurs primarily through the action of enzymes such as amylase. There are two types of amylase involved: salivary amylase (found in saliva) and pancreatic amylase (produced by the pancreas).

5. **Breaking Down Starch**:
- When starch is digested by amylase, the 1,4 glycosidic bonds are broken, resulting in the formation of maltose and other smaller sugar units.

6. **Conclusion**:
- Therefore, the correct answer to the question is that 1,4 glycosidic bonds are broken when starch is digested by amylase.

### Final Answer:
**C. Starch is digested by amylase.**

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