Matching Pairs Hair CompositionOnline version Match the term to the sentence that the term completes. by Rosalind Carter 1 side bond 2 salt bond 3 disulfide bond 4 lanthionine bond 5 hydrogen bond Bond created when disulfide bonds are broken by hydroxide chemical hair relaxers after the relaxer is rinsed from the hair. 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. 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.