单项选择题
A.αB.βC.β′D.σE.ω
A.转录起始点B.Pribnow盒C.Sextama盒D.Hogness盒E.富含GC的反向重复序列
A.CAGCUCAGCACGB.CGACUGAGCUGACC.GACAGUGACAGUD.CGACGGACGUCGE.AGUCAGGACUGA
A.18SrRNAB.28SrRNAC.mRNAD.5SrRNAE.tRNA
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