Functional and fully mature form of insulin has:

Two polypeptide chains A and B mainly linked by glycosidic bonds

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An extra peptide chain called C chain

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Two short polypeptides linked together by disulphide bridges

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One interchain and two intrachain disulfide bridges

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Solution

The correct option is C Two short polypeptides linked together by disulphide bridges
Mature insulin lacks C peptide chain and has one intra and two interchain disulfide bridges between A and B chains.

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