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The two polypeptides of human insulin are linked together by
A
phosphodiester bonds.
B
covalent bonds.
C
disulphide bridges.
D
hydrogen bonds.
Explanation
Chains A and B of insulin are joined by disulphide bonds.
Detailed Solution
Insulin is produced by β-cells of the islets of Langerhans as pro-insulin, made of polypeptide chains A and B with a C-peptide. The C-peptide is removed and the A and B chains remain linked by disulphide bridges.