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Gaokao Biology Practice Question

2．（6分）用体外实验的方法可合成多肽链。已知苯丙氨酸的密码子是UUU，若要在体外 合成同位素标记的多肽链，所需的材料组合是（） ①同位素标记的tRNA ②蛋白质合成所需的酶 ③同位素标记的苯丙氨酸④人工合成的多聚尿嘧啶核苷酸 ⑤除去了DNA和mRNA的细胞裂解液

  1. A.①②④
  2. B.②③④
  3. C.③④⑤
  4. D.①③⑤

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