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The two polypeptides of human insulin are linked together by

1. hydrogen bonds
2. phosphodiester bond
3. covalent bond
4. disulphide bridges

Correct answer: disulphide bridges

Solution

Human insulin consists of two polypeptide chains connected by disulphide bridges formed between cysteine amino acids. These covalent links hold the A and B chains together and are essential for insulin’s structure and function.

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