<prompt> Which amino acid migrates fastest on chromatography on carboxy methylcellulose medium?Aspaic acidValineLysineGlycine  <response>: Ai.e. Aspaic acidIn cation exchange chromatography solid stationary matrix has negatively charged groups i.e. -ve charged carboxy methyl cellulose, 0 - CH2 - COO- is used as cation exchanger. So in the mobile phase, proteins with a net positive charge i.e. cations move slowly than those with net negative charge anionQ. Hence aspaate aspaic acid being a negatively charged amino acid will move fastest in carboxymethyl cellulose or methanol chloroform cation exchanger ion exchange chromatography. 