Starch is polymer of

Options

A. `alpha-D-"Glucose"`
B. `beta-D-"Glucose"`
C. `alpha-D-"Glucose"` and `beta-D-"Glucose"`
D. `alpha-D-"Fructose"`

Explanation

**Step-by-Step Solution:**

1. **Understanding Starch**: Starch is a polysaccharide that serves as a storage form of energy in plants. It is primarily composed of glucose units.

2. **Identifying the Monomer**: The monomeric unit of starch is alpha-D-glucose. This means that starch is formed from the condensation of many alpha-D-glucose molecules.

3. **Components of Starch**: Starch consists of two main components:
- **Amylose**: This is the water-soluble part of starch, typically making up about 20% of the starch content.
- **Amylopectin**: This is the water-insoluble part of starch, making up about 80% of the starch content.

4. **Linkages in Starch**:
- Amylose is primarily composed of α(1→4) glycosidic linkages, where the hydroxyl group of carbon 1 of one glucose molecule links to the hydroxyl group of carbon 4 of another glucose molecule.
- Amylopectin contains both α(1→4) linkages and α(1→6) linkages, where the α(1→6) linkages create branching points in the molecule.

5. **Properties of Starch**: Starch can form a blue-colored complex when it reacts with iodine, which is a characteristic property used for its detection.

6. **Conclusion**: Therefore, the answer to the question "Starch is a polymer of" is **alpha-D-glucose**.

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