真核生物mRNA前体的加工过程不包括
A.5'末端加帽
B.3'末端加多聚A尾
C.甲基化修饰
D.磷酸化修饰
参考答案:D
从北极上空看地球自转方向是_____________。
Tom didn’t like to study at school and later .
A.dropped in
B.dropped out
C.dropped on
D.dropped off