13.下列有关氨基酸的叙述中正确的是 A.自然界中的氨基酸只有20种 b.组成蛋白质的氨基酸约有20种 c.蛋白质都是由20种氨基酸 Template




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tomski13.下列有关氨基酸的叙述中正确的是 a.自然界中的氨基酸只有20种 b.组成蛋白质的氨基酸约有20种 coloring