Practice question

Commercial carrier ampholytes are synthetic mixtures of amphoteric molecules produced by copolymerization of polyamines with unsaturated carboxylic acids like acrylic acid, yielding intricate polyamino-polycarboxylic structures with aliphatic backbones containing numerous isomeric species with closely spaced pI values. Their excellent buffering capacity and conductivity across pH 2-11 allow generation of continuous linear gradients upon application of electric field, essential for high-resolution isoelectric focusing. Histones are basic proteins, phosphopeptides are modified peptides, and betaine is simple zwitterion lacking broad spectral heterogeneity, unable to function as gradient-forming ampholytes.