Amino acids. In each space provided below, write the single-letter abbreviations of all amino acids that match the description.
_____________ contain(s) two chiral carbons
_____________ contain(s) a positively charged side chain at pH 4
_____________ contain(s) a positively charged side chain at pH 7
_____________ contain(s) a negatively charged side chain at pH 7
_____________ contain(s) a negatively charged side chain at pH 12
_____________ contain(s) an imidazole side chain
_____________ contain(s) the most hydrophobic side chain
_____________ contain(s) aromatic side chain(s), with resonant electrons, which can be detected by absorpton spectroscopy
_____________ side chain(s) can covalently link two polypeptide chains through disulfide bonds
_____________ least likely to be found in α-helical peptides
_I , T contain(s) two chiral carbons
____D,E_________ contain(s) a positively charged side chain at pH 4
___K,R,H__________ contain(s) a positively charged side chain at pH 7
____D,E_________ contain(s) a negatively charged side chain at pH 7
______G_______ contain(s) a negatively charged side chain at pH 12
____H_________ contain(s) an imidazole side chain
__I,L___________ contain(s) the most hydrophobic side chain
______F,Y,W_______ contain(s) aromatic side chain(s), with resonant electrons, which can be detected by absorpton spectroscopy
______C_______ side chain(s) can covalently link two polypeptide chains through disulfide bonds
______L_______ least likely to be found in α-helical peptides
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