DNA上某段碱基顺序为:5'-ACTAGTCAG-3',转录后的mRNA相应的碱基顺序为( )
A.5'-TGATCAGTC-3' B.5-UGAUCAGUC-3' C.5'-CU-GACUAGU-3' D.5'-CTGACTAGT-3' E.5'-CAGCUGACU-3'
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