Insulin is a polymer of

Options

A. Ribulose
B. Glucose
C. Fructose
D. Ribose

Answer

**Step-by-Step Solution:**

1. **Identify the Nature of Insulin:**
- Insulin is a hormone that is classified as a polypeptide. Polypeptides are polymers made up of amino acids.

2. **Understanding Polypeptides:**
- Polypeptides are formed by the linkage of amino acids through peptide bonds. Insulin specifically consists of two chains (A and B chains) that are linked together by disulfide bonds.

3. **Source of Insulin:**
- Insulin is secreted by the pancreas, particularly by the beta cells within the pancreas.

4. **Function of Insulin:**
- The primary function of insulin is to regulate blood sugar levels by facilitating the uptake of glucose into cells and converting excess glucose into glycogen for storage.

5. **Analyzing the Options:**
- The options provided are ribulose, glucose, fructose, and ribose.
- Insulin is not made from ribulose, glucose, or ribose directly. Instead, it regulates glucose levels in the body.

6. **Identifying the Correct Polymer:**
- While insulin itself is a polypeptide, the question asks about a polymer related to insulin. Inulin, which is a different substance, is a polymer of fructose.

7. **Conclusion:**
- Therefore, the correct answer to the question "Insulin is a polymer of" is fructose, but it is important to clarify that insulin itself is a polypeptide hormone composed of amino acids.

**Final Answer:**
Insulin is a polypeptide hormone, and while it is not a polymer of fructose, inulin (a different substance) is a polymer of fructose.

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