题目内容
椎骨的典型结构不包括（）
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Which of the following restriction enzymes can produce cohesive ends upon cleavage on their recognition sequences（）
Which gene is required for the lysogenic phage to be adopted for insertional inactivation（）
The cell in which the recombinant molecules are propagated is termed as____（）
The cI gene of phage is of what type（）
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