Mature Insulin consists of

Options

A. Two long polypeptides chains
B. Two long polynucleotide chains
C. Two short polypeptide chains
D. Two short polynucleotide chains

Answer

**Step-by-Step Solution:**

1. **Understanding Insulin Structure**: Insulin is a peptide hormone that plays a crucial role in glucose metabolism. It is produced in the pancreas and is essential for regulating blood sugar levels.

2. **Identifying the Components**: Mature insulin is composed of two distinct polypeptide chains. These chains are known as Chain A and Chain B.

3. **Describing the Chains**:
- **Chain A**: This chain consists of 21 amino acids.
- **Chain B**: This chain consists of 30 amino acids.

4. **Linkage Between Chains**: The two chains (Chain A and Chain B) are not independent; they are linked together by disulfide bridges (covalent bonds formed between cysteine residues). This linkage is crucial for the stability and functionality of the insulin molecule.

5. **Conclusion**: Therefore, the mature insulin consists of two short polypeptide chains, which are Chain A and Chain B, linked by disulfide bridges.

**Final Answer**: Mature insulin consists of two short polypeptide chains (Chain A and Chain B).

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