Insulin is

Options

A. a homopolymer of glucose.
B. a heterpolymer og glucose.
C. a homopolymer of fructose.
D. a heterpolymer og fructose

Answer

### Step-by-Step Solution:

1. **Understanding Insulin**:
- Insulin is a type of polymer. To determine its classification, we need to identify the monomer units that make up this polymer.

2. **Identifying the Monomer**:
- Insulin is composed of D-fructose. This means that the basic building block (monomer) of insulin is fructose.

3. **Linkage Type**:
- The monomer units in insulin are linked together by beta-glycosidic linkages. This is an important characteristic of how the monomers are connected in the polymer.

4. **Classification of Polymers**:
- We need to differentiate between homopolymers and heteropolymers:
- **Homopolymer**: A polymer made up of identical monomer units.
- **Heteropolymer**: A polymer made up of two or more different types of monomer units.

5. **Determining the Type of Polymer**:
- Since all the monomer units in insulin are identical (all are fructose), insulin qualifies as a homopolymer.

6. **Conclusion**:
- Therefore, insulin is classified as a homopolymer of fructose.

### Final Answer:
Insulin is a **homopolymer of fructose**.

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