I’ve ______ the habit of walking through the park.
A. gotten into
B. gotten in
C. gotten off
D. gotten down
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_______, he can quickly find out what’s wrong with the machine.
A. having been well trained
B. Having well trained
C. To be well trained
D. To have been well trained
核仁合成和加工的RNA是()
A.tRNA
B.rRNA
C.mRNA
D.snRNA
E.miRNA
组蛋白能够进入细胞核,是因为其上有()
A. 亲核蛋白
B. 核输入信号
C. 核输入受体
D. 核输出信号
E. 核输出受体
间期细胞核内染色较深的块状结构是()
A. 核小体
B. 螺线管
C. 常染色质
D. 异染色质
E. 染色单体
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