除下列哪一项外基因工程的载体必须具备的条件是 A.是环状形态的dna分子 b.具有一个或多个限制酶切点以便与外源基因连接 C.具有标记基因 Template




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tomski除下列哪一项外基因工程的载体必须具备的条件是 a.是环状形态的dna分子 b.具有一个或多个限制酶切点以便与外源基因连接 coloring