Which of the following restriction enzymes can produce cohesive ends upon cleavage on their recognition sequences（）
A. EcoRI
B. PvuII
C. BamHI
D. HindIII
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Which gene is required for the lysogenic phage to be adopted for insertional inactivation（）
A. cI gene
B. OP gene
C. SR gene
D. exo gene
The cell in which the recombinant molecules are propagated is termed as____（）
A. host
B. vector
C. plasmid
D. carrier
The cI gene of phage is of what type（）
A. Inducer
B. Promoter
C. Repressor
D. Silent gene
根据酶切活性对盐浓度的要求，Ⅱ型限制性核酸内切酶往往可分成（）
A. 2 大类
B. 3大类
C. 4大类
D. 5 大类
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