I believe its the very last one or the very 1st one. sorry I could only give a 50/50 answer:/
<span>C,H,N,O,SAmino Acid=C+Amino Group+Carboxyl Group+Variable Group<span>4 Levels of Protein Structure:Primary: Order of Amino AcidsSecondary:3-D shapeTertiary: globularQuaternary: 2+ chains linked</span>Fn: Structure, Transport, Communicate, Speed up chemical rxns, Control cell growth</span>