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【单选题】
If a gene is expressed only in certain organs or tissues, this is called （ ）
A.
stage specificity of gene expression
B.
none of the above
C.
spatial specificity of gene expression
D.
temporal specificity of gene expression
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参考答案：
参考解析：
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举一反三
【多选题】What are the steps of PCR?（ ）
A.
Extension
B.
Annealing
C.
Transformation
D.
Denaturation
【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
【单选题】Which is NOT the basal cis-acting elements in eukaryotes?（ ）
A.
enhancer
B.
operator
C.
insulator
D.
promoter