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【单选题】
In insertional inactivation screening, the bacteria that are sensitive to tetracycline and resistant to ampicillin should be transformed with（ ）
A.
Nothing
B.
Recombinant DNA
C.
Self-cyclized vectors
D.
Foreign DNA only
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Which is NOT the basal cis-acting elements in eukaryotes?（ ）
A.
enhancer
B.
operator
C.
insulator
D.
promoter
【单选题】The loading capacity of plasmids is usually （ ）
A.
Up to 45kb
B.
More than10kb
C.
Less than 10kb
D.
More than 20kb