单选题
A转录终止后在AAUAAA序列下游切断RNA、并加尾
B在转录过程中同时加入
C转录出AAUAAA序列时终止、并加入其后
D转录出富含GU（或U）序列时终止、并加入其后
E以上都不对
正确答案
答案解析
略
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