The 20 Amino Acids
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Three modes: Name the structure, Classify its side chain (nonpolar, polar uncharged, acidic, basic), or give its Charge at physiological pH. Each answer reveals the codes, pKa values, isoelectric point (pI), and key facts.
A classic mnemonic for the nine essential amino acids is “PVT TIM HaLL”: Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Leucine, and Lysine.