Which amino acids in Table 23.1 have more than one asymmetric carbon? Table 23.1 The Most Common

Which amino acids in Table 23.1 have more than one asymmetric carbon?

Table 23.1

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The Most Common Naturally Occurring Amino Acids The amino acids are shown in the form that predominates at physiological pH (7.3). Average relative abundance Formula Name Abbreviations in proteins Aliphatic side chain H-ÇHCO Glycine Gly G 7.5% amino acids *NH3 CH3-CHCO Alanine Ala A 9.0% *NH3 CH;CH-CHCO Valine* Val V 6.9% ČH3 *NH3 CH;CHCH,-CHÖ *NH3 Leucine* Leu L 7.5% ČH3 CH;CH,CH-CHCO Isoleucine* Ile I 4.6% ČH3 *NH3 HOCH2-CHCO 7.1% Hydroxy-containing amino acids Serine Ser S *NH3 CH;CH-CHCO 1. ÓH *NH3 Threonine* Thr T 6.0% + Essential amino acids