The polysaccharide that is not made up of only one type of monosaccharide is

Options

A. glycogen
B. cellulose
C. insulin
D. all of the above

Answer

To solve the question, "The polysaccharide that is not made up of only one type of monosaccharide is," we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are large molecules made up of long chains of monosaccharides (simple sugars). They can be classified into two categories: homopolysaccharides (made from one type of monosaccharide) and heteropolysaccharides (made from more than one type of monosaccharide).

2. **Analyzing Glycogen**:
- Glycogen is a polysaccharide that serves as a form of energy storage in animals. It is composed entirely of glucose units linked together. The linkages are primarily alpha-1,4 glycosidic bonds with branching occurring via alpha-1,6 glycosidic bonds. Since glycogen is made up of only one type of monosaccharide (glucose), it is a homopolysaccharide.

3. **Analyzing Cellulose**:
- Cellulose is another polysaccharide, primarily found in the cell walls of plants. Like glycogen, cellulose is also composed of glucose units. However, the glucose molecules in cellulose are linked by beta-1,4 glycosidic bonds, and it forms a straight chain rather than branching. Since cellulose is also made up of only one type of monosaccharide (glucose), it is also a homopolysaccharide.

4. **Analyzing Insulin**:
- Insulin is not a polysaccharide; it is a peptide hormone composed of amino acids. It consists of two peptide chains (A and B chains) linked together by disulfide bonds. Since insulin is not a polysaccharide at all, it does not fit the definition of being made up of monosaccharides.

5. **Conclusion**:
- Among the options given, both glycogen and cellulose are homopolysaccharides made up of a single type of monosaccharide (glucose). However, insulin is not a polysaccharide at all. Therefore, the correct answer to the question is **insulin**, as it is the only option that is not a polysaccharide and thus not made up of monosaccharides.

### Final Answer:
The polysaccharide that is not made up of only one type of monosaccharide is **insulin**.

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