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问题 单项选择题

以下反应属于RNA编辑的是

A．转录后碱基的甲基化
B．转录后产物的剪接
C．转录后产物的剪切
D．转录产物中核苷酸残基的插入、删除和取代
E．转录后不同产物之间的连接

答案

参考答案：D

完形填空

Whenever Kate goes to the hospital, she sees many patients there. She hopes to help them, so Kate wants to be a nurse when she 小题1:g   ▲   up.

Last summer Kate broke her right 小题2:l   ▲  . The pain was serious and she could not even walk. She got to the hospital by car and the doctor said that she had to 小题3:s   ▲   there for about two weeks.

One afternoon a 小题4:n   ▲   came to Kate’s bed and said with a smile, “You are getting 小题5:b   ▲  . You can walk again soon, so don’t think only about bad things. Try to be happy!” The nurse was very kind and they became good 小题6:f   ▲  .

After Kate 小题7:l   ▲   the hospital, she thought a lot about the kind nurse. She now understands that the 小题8:w   ▲   of nurses is very important, because they often give hope to the 小题9:s   ▲  .

Now Kate is thinking about her own future. She often talks with her parents about it. She knows what she should do to become a good nurse, and now she is小题10:s   ▲   very hard at school.
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