15 氨基酸、蛋白质和核酸 蛋白质的结构 Primary Secondary Tertiary Quaternary structure structure structure structure Lys Lys Gly Leu His Amino acid residues a Helix Polypeptide chain Assembled subunits 蛋白质的结构 15 氨基酸、蛋白质和核酸