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简述基因克隆的步骤。

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限制性内切核酸酶有哪些特点？

简述重组DNA技术中目的基因的获取来源和途径。

My grandmother was a nurse at the Henry Ford Hospital.

A. 对
B. 错

My brother and I could not go out to get a burger or a pizza, for Dad and Mom had time to cook meals at home.

A. 对
B. 错