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In insulin molecule S–S linkage is in between 
 

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a
Cysteine – Glycine 
 
b
Cysteine – Cysteine 
 
c
Cysteine – Valanine 
 
d
Proline – Cysteine 
 

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detailed solution

Correct option is B

The A chain of insulin is 21 amino acids long. The sixth and eleventh amino acids in the A chain are cysteines and they are connected by a disulfide bond. The B chain of insulin is 30 amino acids long. The seventh amino acid in chain A and the seventh amino acid in chain B are cysteines and they are connected by a disulfide bond. The twentieth amino acid in chain A and the nineteenth amino acid in chain B are cysteines and they are connected by a disulfide bond.

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