问答题

(南开大学2008年考研试题)乳糖操纵子有正调节和负调节两种，正调节由___执行，发生在_位点；负调节由_执行，发生在___位点。

【参考答案】

正确答案：CAP蛋白启动子阻遏蛋白操纵蛋白

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