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【简答题】
给你下列菌株:菌株A.F + ,基因型A + B + C + ,菌株B.F - ,基因型A - B - C - ,问题:1.指出A 与B接合后导致重组的可能基因型。当F + 成为Hfr 菌株后,两株菌接合后导致重组的可能基因型。2.两株基因型分别为A + B - 和A - B + 的大肠杆菌(E.coli)混合培养后出现了野生型菌株,你如何证明的出现是接合作用,转化作用或转导作用的结果。你如何确证基因的交换和重组是由于转化?转导?还是接合?
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【判断题】铁路危险货物运输、铁路阔大货物(超限、超长、超重、集重货物)运输、铁路鲜活货物运输和其他特定运输条件货物运输，以上在中国铁路统称为“特种货物运输”。（ ）
A.
正确
B.
错误
【简答题】About 75 percent of those surveyed today ______ being less sympathetic than what was the average score 30 years ago.
【单选题】The French, proud of their delicious and high-class cuisine, don’t like fast food. About 80 percent of them think it is unhealthy, followed by 75 percent of Japanese. The word “cuisine” in the passage...
A.
food
B.
house
C.
water
D.
country
【单选题】Nuclear power plants provide about 17 percent of the world's electricity. Some countries depend more on nuclear power for electricity than others. In France, for instance, about 75 percent of the elec...
A.
Y
B.
N
C.
NG
【简答题】America is sick. At least a lot of it is. An alarming 45% of Americans suffer from some form of chronic illness, and about one-quarter of us are plagued by more than one condition. It seems the widely...
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