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Solution


Q.

The two polypeptides of human insulin are linked together by                   [2016]
1 covalent bond  
2 disulphide bridges  
3 hydrogen bonds  
4 phosphodiester bond  

Ans.

(2)

Human insulin is made up of 51 amino acids arranged in two polypeptide chains. Chain A has 21 amino acids and chain B has 30 amino acids. The two polypeptide chains are interconnected by disulphide bridges or S-S-linkages.