What is electrophoresis? A. a technique that separates amino acids on the basis of their polarity B. a technique that separates amino acids on the basis of their solubility in water C. a technique that separates amino acids on the basis of their pI values D. a technique that separates amino acids on the basis of pKa of -COOH values E. a technique that separates amino acids on the basis of pKa of -+NH3 values