果蝇全部基因组含有1.65×；108bp（碱基对），如果DNA是一长线状分

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问题单项选择题

果蝇全部基因组含有1.65×；10⁸bp（碱基对），如果DNA是一长线状分子，每秒复制30bp，共有2000个双向复制起点，全部基因组要复制多少分钟？（）

A.23分钟

B.32分钟

C.56分钟

D.44分钟

答案

参考答案：A

填空题

根据句意，用括号内所给词的适当形式填空。

1. She sees a film _____ (one) a month.

2. Tom was _____ (illness) yesterday, so he didn't go to school.

3. Doing exercise can help us stay _____(health).

4. Li Hua had a _____ (quickly) breakfast and then went to work.

5. Don't _____ (worried) about your English. I can help you.

6. It takes me an hour_____ (get) to school every day.

7. Will you go climbing with us if it _____ (not snow) next Sunday?

8. It's ten _____ (minute) ride from my home to school.

9. There is a girl _____ (draw) a picture under the tree.

10. Students of English will find the book very _____. (use)

填空题

发现有人触电应立即（），使触电人脱离（），并就地急救。如在高空作业，抢救时必须注意防止（）。