1. Mixtures of amino acids at pH=7.0 can be separated by ion exchange chromatography. Amino acids placed on a cation exchange resin containing sulfonate (SO3) functional groups will flow through the column at different rates because of two factors that influence their movement: 1) Ionic attraction between the sulfonate groups and positively charged groups on the amino acids. 2) Hydrophobic interactions between the amino acids and the polystyrene resin. For each pair of amino acids, determine which will elute first from the cation exchange resin. a. Aspartate and lysine b. Arginine and methionine c. Glutamate and valine d. Glycine and leucine e. Serine and alanine