A disulphide bridge in a protein forms between the side chains of two
- 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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