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【单选题】
细菌性菌的主要生理功能是:
A.
使菌体附着生物体表面
B.
不同性别菌株间起 “ 接合 ” 作用
C.
从它种菌株中吸取养料
D.
既起附着作用,也有性 “ 接合 ” 作用
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A.
正确
B.
错误
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A.
法律
B.
社会
C.
法律与社会
D.
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A.
wind
B.
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C.
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D.
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A.
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B.
研究对象的简单性
C.
研究方法的多学科性
D.
以病人为研究对象
E.
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A.
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B.
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C.
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D.
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【单选题】通过转化(或转染)可将外源性重组DNA导入( )表达
A.
质粒
B.
受体细胞
C.
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D.
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【简答题】It was (wind) and I felt cold.
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