搜题请搜索小程序“爱下问搜题”
问题 单项选择题

AATAAA是

A．真核生物的顺式作用元件

B．启动子的辨认序列

C．真核生物的反式作用因子

D．真核生物转录加尾修饰点

答案

参考答案：D

解析：AATAAA是真核生物转录加尾修饰点。

阅读理解
观察图片，使人物与图片配对

1. __________
2.__________
3. __________
4. __________
5. __________
A. Doctor Liu is a heavy man with glasses.
B. Mother's beautiful, but she's heavy.
C. Aunt is good-looking and she has long curly hair.
D. Jack is tall and doesn't have any hair.
E. Teacher is thin and he's writing at the desk.
F. Han Meimei is a tall girl with long straight hair.
G. Ted always wears glasses with short curly hair.
查看答案
问答题

有一台冲天炉鼓风机，其容量为95KW，需采用降压起动。车间电源电压为550V，电动机铭牌有550V，220A。该鼓风机能否采用星形-三角形起动
查看答案