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【单选题】
如图为基因表达载体的模式图,下列有关基因工程中载体的说法错误的是 ( )
A.
基因工程的核心步骤是基因表达载体的构建
B.
任何基因表达载体的构建都是一样的，没有差别
C.
图中启动子位于基因的首端，是 RNA 聚合酶识别和结合的部位
D.
抗生素抗性基因的作用是作为标记基因，用于鉴别受体细胞中是否导入了目的基因
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由纤维软骨构成的关节唇
B.
坚韧的肱二头肌长头腱
C.
由4块肌的肌腱构成的肩袖
D.
薄弱而松驰的关节囊
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【单选题】使肩关节灵活性加大的有关结构是
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由纤维软骨构成的关节唇
B.
坚韧的肱二头肌长头腱
C.
由4块肌的肌腱构成的肩袖
D.
薄弱而松弛的关节囊
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【单选题】How did the Pontiac Division respond to the customer’s first complaint?
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It considered it crazy.
B.
It took it very seriously.
C.
It made no response.
D.
It blamed the man for the problem.
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【单选题】使肩关节灵活性加大的有关结构是
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由纤维软骨构成的关节唇
B.
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【单选题】How did the Pontiac Division respond to the customer’s first complaint?
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It considered it crazy.
B.
It took it very seriously.
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B.
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