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
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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
Which of the following is used to precipitate the nucleic acids（）
A. glycerol
B. ethanol
C. methanol
D. ethylene
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