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【单选题】
下列有关大肠杆菌乳糖操纵子模型的描述，正确的是______。A.
如果在培养基中，只有乳糖为唯一碳源，CAP蛋白与乳糖操纵子结合。
B.
如果在培养基中，只有乳糖为唯一碳源，阻遏蛋白与乳糖操纵子的操纵子序列结合，操纵子关闭。
C.
如果在培养基中，只有葡萄糖为唯一碳源，则CAP蛋白与乳糖操纵子结合。
D.
如果在培养基中，乳糖和葡萄糖都不存在，CAP蛋白与乳糖操纵子操纵子序列结合。
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皮皮学刷刷变学霸
举一反三
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使患者感觉舒适
B.
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【单选题】为解除非尿路阻塞引起的尿潴留，用温水冲洗会阴的目的是
A.
分散注意力，缓解紧张心理
B.
利用条件反射促进排尿
C.
使病人感觉舒适
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缓解尿道痉挛
E.
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【单选题】I had always traveled to Malaysia by plane or car, so this was the first time I was on a train. I did not relish the long train journey and had brought along a dozen magazines to read and reread. I lo...
A.
choose
B.
enjoy
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prepare for
D.
carry on
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