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In insulin molecule S - S linkage is in ...

In insulin molecule S - S linkage is in between

A

Cysteine - Glycine

B

Cystein - Cystein

C

Cysteine - Valanine

D

Proline - Cystein

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### Step-by-Step Solution: 1. **Understanding Insulin Structure**: - Insulin is a peptide hormone composed of 51 amino acids. It consists of two chains, known as the A-chain and B-chain, which are linked together. 2. **Identifying the Key Linkage**: - The question specifically asks about the S-S (disulfide) linkages in the insulin molecule. Disulfide linkages are formed between the sulfur atoms of cysteine residues. 3. **Locating Cysteine Residues**: - In the insulin molecule, there are cysteine residues that participate in forming these disulfide bonds. 4. **Types of Disulfide Linkages**: - Disulfide linkages can occur both within a single chain (intrachain) and between different chains (interchain). In insulin, there are both types of linkages. 5. **Conclusion**: - The S-S linkages in insulin are primarily between cysteine residues. Specifically, they are formed between cysteine (Cys) residues in both the A-chain and B-chain, as well as within the chains themselves. 6. **Final Answer**: - The S-S linkage in the insulin molecule is between cysteine (Cys) residues.
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