题目内容

前体mRNA在5¢-末端加入“帽”结构

A. 大多数真核mRNA的5¢-末端有7-甲基鸟嘌呤的帽结构
B. 加帽酶和甲基转移酶催化完成“帽”结构
C. “帽”结构使mRNA免遭核酸酶的攻击
D. “帽”结构参与mRNA和核糖体的结合,
E. 启动蛋白质的生物合成

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