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【单选题】
经15N同位素标记的一段双链DNA片段在14N培养液经n代后,含纯14N的双链DNA有( )
A.
2 n+1
B.
2 n-1
C.
2 n-2
D.
2 n
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参考答案:
举一反三
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
problem
B.
research questions
C.
hypothesis
D.
procedure
E.
findings
F.
conclusion
查看完整题目与答案
【单选题】—How about going out for a picnic on Sunday morning? —Hmm.___.The weather is very good these days.
A.
Yes, why not
B.
Well, no way
C.
Oh, never mind
D.
Sure, no matter
查看完整题目与答案
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
P -- Problem
B.
Q -- research questions
C.
H -- hypothesis
D.
PR -- procedure
E.
F -- findings
F.
C -- Conclusion
查看完整题目与答案
【简答题】( )是仿生形态最基本、最微观的部分。是对生物体和自然界物质存在的内部结构原理的模仿。
查看完整题目与答案
【简答题】完形填空。 In some areas of the world the weather is very 1_____ and this fact plays an important part in the daily lives of the people. 2_____ they are farmers, fishermen, or sailors, for instance, they 3...
查看完整题目与答案
【简答题】微血管病性溶血性贫血的发病机制主要与下列哪项因素有关? A.微血管内皮细胞大量受损 B.纤维蛋白丝在微血管腔内形成细网 C.血小板的损伤 D.小血管内血流淤滞 E.白细胞的破坏作用
查看完整题目与答案
【判断题】the weather is very bad today.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Now_____is late autumn and the weather is very cool.
A.
that
B.
it
C.
this
D.
one
查看完整题目与答案
【单选题】微血管病性溶血性贫血的发病机制( )
A.
微血管内皮细胞大量受损
B.
小血管强烈收缩
C.
小血管内流血淤滞
D.
微血管内大量微血栓形成
E.
纤维蛋白丝在微血管腔内形成
查看完整题目与答案
【单选题】–The weather is very cold these days. – .
A.
So do I
B.
So is it
C.
So it is
查看完整题目与答案
相关题目:
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
problem
B.
research questions
C.
hypothesis
D.
procedure
E.
findings
F.
conclusion
查看完整题目与答案
【单选题】—How about going out for a picnic on Sunday morning? —Hmm.___.The weather is very good these days.
A.
Yes, why not
B.
Well, no way
C.
Oh, never mind
D.
Sure, no matter
查看完整题目与答案
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
P -- Problem
B.
Q -- research questions
C.
H -- hypothesis
D.
PR -- procedure
E.
F -- findings
F.
C -- Conclusion
查看完整题目与答案
【简答题】( )是仿生形态最基本、最微观的部分。是对生物体和自然界物质存在的内部结构原理的模仿。
查看完整题目与答案
【简答题】完形填空。 In some areas of the world the weather is very 1_____ and this fact plays an important part in the daily lives of the people. 2_____ they are farmers, fishermen, or sailors, for instance, they 3...
查看完整题目与答案
【简答题】微血管病性溶血性贫血的发病机制主要与下列哪项因素有关? A.微血管内皮细胞大量受损 B.纤维蛋白丝在微血管腔内形成细网 C.血小板的损伤 D.小血管内血流淤滞 E.白细胞的破坏作用
查看完整题目与答案
【判断题】the weather is very bad today.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Now_____is late autumn and the weather is very cool.
A.
that
B.
it
C.
this
D.
one
查看完整题目与答案
【单选题】微血管病性溶血性贫血的发病机制( )
A.
微血管内皮细胞大量受损
B.
小血管强烈收缩
C.
小血管内流血淤滞
D.
微血管内大量微血栓形成
E.
纤维蛋白丝在微血管腔内形成
查看完整题目与答案
【单选题】–The weather is very cold these days. – .
A.
So do I
B.
So is it
C.
So it is
查看完整题目与答案
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