题目内容

Choose the best answers.1. He asked me _____ told me about the accident.

A. whom
B. which
C. who
D. whose

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It depends on _____ you look at it.

A. where
B. which
C. why
D. how

Miss Liu said ______ she would leave the book on her desk.

A. that
B. which
C. if
D. what

在下列哪种情况下，乳糖操纵子的转录活性最高

A. 高乳糖低葡萄糖
B. 高乳糖高葡萄糖
C. 低乳糖低葡萄糖
D. 低乳糖高葡萄糖

下列哪个操纵子可能不含有弱化子序列？

A. trp操纵子
B. lac操纵子
C. phe操纵子
D. his操纵子