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【单选题】

Plasmids are usually introduced into bacterial cells by.( )

A.
Transfection
B.
Infection
C.
Transformation
D.
Transduction
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参考答案:
参考解析:
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【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】完成一门课程学生所要达到的要求一般称为( )

A.
单元目标
B.
教学目标
C.
课时目标
D.
培养目标
E.
教育目的