Because a circle has no beginning or end, the wedding ring is a symbol of_______ love.
A. prominent
B. Extravagant
C. eternal
D. dominant
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What he had in mind _________ to nothing less than a total reversal of the traditional role of the executive.
A. contributed
B. dedicated
C. amounted
D. attributed
下列能够调控真核生物转录的DNA元件是
A. 增强子
B. 操纵子
CAP结合位点
D. 阻遏蛋白基因
在乳酸操纵子的负性调节机制中，阻遏蛋白结合的位点是
A. 启动子
B. 操纵序列
CAP结合位点
D. Z基因
在乳糖操纵子中，分解物基因激活蛋白结合的结构是
A. 启动序列
B. 操纵序列
C. 编码序列
D. CAP结合位点
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