Q.

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 
 

answer is B.

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Detailed Solution

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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