Which has glycosidic linkage?

Options

A. amylopectin
B. amylase
C. cellulose
D. all of these

Answer

To determine which of the given compounds has glycosidic linkage, we need to analyze each option provided:

1. **Understanding Glycosidic Linkage**:
- Glycosidic linkage is a type of covalent bond that connects two monosaccharides (sugars) or a sugar to another group. It is formed when the hydroxyl group of one sugar reacts with the anomeric carbon of another sugar, resulting in the release of a water molecule (a condensation reaction).

2. **Analyzing the Options**:
- **Amylopactin**: This is a polysaccharide composed of D-glucose units. The glucose units in amylopactin are linked together by glycosidic linkages. Additionally, amylopactin is a branched-chain polymer, which means it has multiple glycosidic linkages connecting the glucose units.

- **Amylase**: This is an enzyme that catalyzes the hydrolysis of starch into sugars. While it interacts with polysaccharides, it is not a polysaccharide itself and does not contain glycosidic linkages. Therefore, amylase does not have glycosidic linkages.

- **Cellulose**: This is another polysaccharide made up of D-glucose units. The glucose units in cellulose are also connected by glycosidic linkages. Cellulose is a linear polymer, and the glycosidic linkages are crucial for its structural properties.

3. **Conclusion**:
- Both amylopactin and cellulose contain glycosidic linkages due to the presence of D-glucose units linked together. Amylase, however, does not have glycosidic linkages as it is an enzyme and not a polysaccharide.

Thus, the correct answer is that **amylopactin and cellulose have glycosidic linkages**.

### Final Answer:
Amylopactin and cellulose have glycosidic linkage.