The monomer units in starch are

Options

A. Pyarnose frucotose
B. Furannose
C. `beta`-D-Glucose
D. `alpha`- D-Glucose

Answer

To determine the monomer units in starch, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Starch**: Starch is a polysaccharide, which means it is made up of many sugar units. The primary component of starch is glucose.

2. **Forms of Starch**: Starch exists in two main forms: amylose and amylopectin.
- **Amylose**: This is a linear chain of glucose units.
- **Amylopectin**: This has a branched structure, consisting of glucose units as well.

3. **Hydrolysis of Starch**: When starch is hydrolyzed (broken down), it yields its monomer units.

4. **Identifying the Monomer**: The monomer unit of starch is specifically alpha-D-glucose. This is the form of glucose that is released when starch is broken down.

5. **Conclusion**: Therefore, the monomer units in starch are alpha-D-glucose.

### Final Answer:
The monomer units in starch are **Alpha-D-Glucose** (Option D).

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