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Standard XII
Biology
Insulin in Humans
Question

The two polypeptides of human insulin linked together by
  1. Covalent bond
  2. Hydrogen bonds
  3. Disulphide bridges
  4. Phosphodiester bond

A
Hydrogen bonds
B
Phosphodiester bond
C
Disulphide bridges
D
Covalent bond
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Solution
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Insulin is composed of two peptide chains referred to as the A chain and B chain. A and B chains are linked together by two disulfide bonds, and an additional disulfide is formed within the A chain. In most species, the A chain consists of 21 amino acids and the B chain of 30 amino acids.

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