根据R基团对水分子的亲和性,氨基酸可分为( )性氨基酸和( )性氨基酸。
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在蛋白质氨基酸中,只有(填英文3字缩写符号)与茚三酮反应产生黄色物质,其余的氨基酸生成( )色物质。
氨基酸在等电点(pI)时主要以( )离子形式存在;在pH>pI的溶液中,主要以( )离子形式存在。
( ): Amino acids that cannot be synthesized by humans (and other vertebrates) and must be obtained from the diet.
( ): The pH at which a solute has no net electric charge and thus does not move in an electric field.