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【单选题】
下列载体中对外源DNA片段的容量最大的是( )A.
酵母人工染色体（YAC）
B.
C.
D.
λ噬菌体
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【简答题】A．He ran a red light and collided with a truck. B．He sacrificed his life to save a baby girl. C．He was killed instantly in a burning car. D．He got married to Karen' s mother.
【简答题】A.He ran a red light and collided with a truck. B.He sacrificed his life to save a baby girl. C.He was killed instantly in a burning ear. D.He got married to Karens mother.
【单选题】He was a qualified doctor who rarely practiced but instead devoted his life to writing. He once said: 'Medicine is my lawful wife, and literature is my lover. ' Russian writer Anton Pav-lovich Chekhov...
A.
had a lawful lover
B.
was an illegal writer
C.
used to be a lawyer
D.
was a competent doctor
【简答题】金属硫蛋白( MT )是一类广泛存在的金属结合蛋白,某研究小组计划通过多聚酶链式反应( PCR )扩增获得目的基因,构建转基因工程菌,用于重金属废水的净化处理。如图是 PCR 扩增过程示意图,请回答下列问题: 1 从高表达 MT 蛋白的生物组织中提取 mRNA ,通过 ______ _ 获得 _ ____ _ 用于 PCR 扩增。 2 设计一对与 MT 基因两端序列互补配对的引物( 引物...
【单选题】It was in ______ that he decided to dedicate his life to the struggle against racial oppression.
A.
Harvard
B.
Barington
C.
Fisk
D.
Washington
【单选题】He was a qualified doctor who rarely practised but instead devoted his life to writing. He once said: 'Medicine is my lawful wife, and literature is my lover. ' Russian writer Anton Pavlovich Chekhov ...
A.
had a lawful lover
B.
was an illegal writer
C.
used to be a lawyer
D.
was a competent doctor
【单选题】He was______ that he should devote his life to his motherland.
A.
decided
B.
determined
C.
discussed
D.
figured
【简答题】A．He ran a red light and collided with a truck. B．He sacrificed his life to save a baby girl. C．He was killed instantly in a burning car. D．He got married to Karen's mother.
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