The "permanent" part of adding wave in hair is due primarily to which of these actions?
A)rearrangement of hydrogen bonds between hair fibres
B)reduction and re-oxidation of disulfide bonds in hair fibres
C)reestablishment of new ionic interactions between hair fibres
D)breaking and reforming peptide bonds in the hair polypeptides

Question

Quizplus · Accepted Answer

The reduction and re-oxidation of disulfide bonds in hair fibres is the primary action responsible for the permanent part of adding wave in hair. Disulfide bonds are covalent bonds between two sulfur atoms in cysteine amino acid residues of the hair keratin protein. Breaking these bonds allows the hair to be reshaped, and re-oxidizing them reforms the bonds in the new shape, making it permanent. Other options mentioned - rearrangement of hydrogen bonds, reestablishment of new ionic interactions, breaking and reforming peptide bonds - are actions associated with temporary methods of adding wave in hair.

The "Permanent" Part of Adding Wave in Hair Is Due