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大肠杆菌3个Hfr菌株利用中断交配技术，分别与营养缺陷型F - 菌株交配，获得下表结果： 供体位点 进入时间/min HfrP 4 X HfrKL98 HfrRa-2 gal + 11 67 70 thr + 94 50 87 xyl + 73 29 8 lac + 2 58 79 his + 38 94 43 ilu + 77 33 4 arg + 62 18 19 试利用上述资料建立一个大肠杆菌染色体图，包括以min表示的图距，并标出各Hfr菌株F因子的插入位点及转移方向。
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举一反三
【单选题】王女士,55岁,连续应用抗菌素达半个月,其口腔粘膜出现白色溃疡面,可考虑为( )
A.
病毒感染
B.
口腔白斑
C.
口腔真菌感染
D.
口腔寄生虫感染
E.
口腔绿脓杆菌感染
【单选题】Section B Conversation 2 第10题
A.
:In three working days
B.
Within tw o l weeks.
C.
The next day.
D.
A month later.
【简答题】下列哪些战略类型的市场增长率较高( )。
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
Commenting on a picture.
B.
Looking at some paint
C.
Painting a picture.
D.
Comparing two paintings.
【简答题】在匀强磁场中,当载流导线与磁场垂直时,导线所受安培力的大小等于导线中的____ 、____ 、____ 的乘积。这就是安培定律。
【单选题】听力原文：M: Our headmaster has been busy since last month. He never stops working until twelve o'clock at night as I know. W: I should never have troubled him so much, had I known he was so busy. Q: What ...
A.
The woman has troubled the headmaster.
B.
The woman has not troubled the headmaster.
C.
The headmaster has not been busy this month.
D.
The man has troubled the headmaster very much.
【多选题】Part III True or False (20 points, 2 points for each). Listen to 2 conversations and write T for true/F or false 判断题.mp3: Conversation
A.
1. Beth made some phone calls last week. 2. Beth dialed a wrong number four times. 3. Raul’s sister doesn’t speak English. 4. Beth’s mother is always on the phone. 5. Beth got a cheaper plane ticket to Caracas. Conversation
B.
6. Brandon has a brother. 7. Brandon had a birthday last week. 8. Brandon was a good boy before. 9. Brandon didn’t change. 10. Lee has two infants.
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