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【判断题】
The genetic code has four letters, A, T, G, and C. （ ）
A.
正确
B.
错误
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举一反三
【单选题】In the regulation of lac operon, when the medium contains only glucose, which statement is true?（ ）
A.
concentration of cAMP is high, CAP is active
B.
concentration of cAMP is low, CAP is active
C.
concentration of cAMP is high, CAP is inactive
D.
concentration of cAMP is low, CAP is inactive
【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
相关题目：
【单选题】In the regulation of lac operon, when the medium contains only glucose, which statement is true?（ ）
A.
concentration of cAMP is high, CAP is active
B.
concentration of cAMP is low, CAP is active
C.
concentration of cAMP is high, CAP is inactive
D.
concentration of cAMP is low, CAP is inactive
【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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