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名词解释题
knock in （基因嵌入）
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下列有关基因重组的说法中不正确的是（）。A、基因重组能够产生多种基因型B、非同源染色体上的非等位基因可以发生重组C、基因重组是生物变异的根本来源D、基因重组仅发生在有性生殖的过程中E、基因敲入（knock in）通过基因重组而实现
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单选题Hardly I had sat down when I heard someone knock at the door.A
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misalignment or worn main bearingsB
insufficient cylinder lubricationC
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all of the above
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单选题下列有关基因重组的说法中不正确的是（）。A
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基因敲入（knock in）通过基因重组而实现
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