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【单选题】
关于真核生物tRNA的加工过程的描述,错误的是( )。
A.
酵母菌tRNATyr的前体tRNA带有一个16个核苷酸的5′端前序列,一个14个核苷酸内含子和2个额外的3′端核苷酸。
B.
在加工过程中,5′端前导序列由RNase P切除。
C.
真核生物成熟tRNA 3′端的CCA是转录初始产物上本来就有的序列。
D.
真核生物tRNA加工机制在进化中是高度保守的。
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