The cell in which the recombinant molecules are propagated is termed as____（）
A. host
B. vector
C. plasmid
D. carrier
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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
What is the capsid （protective coat） of the bacteriophage made up of（）
A. DNA
B. Protein
C. RNA
D. Organic acids
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