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【单选题】
控制细菌主要性状的基因、控制根霉菌主要性状的基因、控制病毒抗原特异性的基因依次位于 ①拟核DNA上 ②DNA上 ③细胞核染色体上 ④核衣壳内核酸上 [ ]A.
①③④
B.
①②④
C.
②①③
D.
②①④
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