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问题 单项选择题

真核生物的mRNA在其3'末端有poly(A)+结构，而对于poly(A)-mRNA来说( )。

A．根本不存在

B．有poly(A)-mRN

C．有poly(A)-mRNA，似乎也能被翻译，但与poly(A)+m

D．有poly(A)-mRNA，也能被翻译，而且其动力学与poly(A)+

答案

参考答案：D

单项选择题

下列哪项不是正常结膜的防护机制

A．眼睑闭合不全

B．结膜表面正常菌丛

C．泪液冲刷作用

D．眼表湿度较低

E．完整的眼表上皮
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填空题

用适当的关系词填空。

1. Everything ______ I know will be taught to the students.

2. This is the best film ______ I have ever seen.

3. The picture ______ has a house and flowers is the one I like best.

4. The house ______ stands on the top of the hill was built last month.

5. The medicine ______ he bought is good for your health.

6. He is the only person ______ saw the accident yesterday.

7. The present ______ he gave her yesterday evening is still unopened.

8. The newspaper ______ you are reading is two days old.

9. The student ______ the teachers are talking about has won the first prize in the English contest.

10. I know the girl ______ the teacher praised yesterday.
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