A disulphide bridge in a protein forms between the side chains of two
Correct answer: A. cysteine residues
- A. cysteine residues
- B. glycine residues
- C. lysine residues
- D. serine residues
Explanation
Two sulphydryl groups are oxidised to form a covalent S-S link, the strongest of the interactions holding tertiary structure. This is why heavy metal ions, which attack sulphur, denature proteins irreversibly. Permanent waving of hair works by breaking and re-forming these bridges in keratin.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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