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(单选题)

poly(A)尾的加入时机是()。

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

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