题目内容

下列有关RNA的叙述，正确的是

A. RNA分子不含双螺旋结构
B. rRNA是分子量最小的RNA
C. 胸腺嘧啶是BNA的特有碱基
D. rRNA参与核糖体的组成
E. tRNA是蛋白质生物合成的直接模板

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