Matching Pairs Hair CompositionOnline version Match the term to the sentence that the term completes. by Rosalind Carter 1 side bond 2 disulfide bond 3 hydrogen bond 4 salt bond 5 lanthionine bond Bond created when disulfide bonds are broken by hydroxide chemical hair relaxers after the relaxer is rinsed from the hair. Bond that cross-links the polypeptide chains together and is responsible for the extreme strength and elasticity of human hair. Weak, physical, cross-link side bond that is easily broken by water or heat. Strong, chemical side bond that joins the sulfur atoms of two neighboring cysteine amino acids. Weak, physical, cross-link side bond between adjacent polypeptide chains, easily broken by strong alkaline or acidic solutions.