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【单选题】
下列不属于细胞内第二信使特点的是A.
不位于能量代谢途径的中心
B.
在细胞中的浓度可迅速改变
C.
在细胞中的分布可迅速改变
D.
是主要物质代谢通路的核心分子
E.
作为别构效应剂作用于相应的靶分子
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反馈参考答案：
举一反三
【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【简答题】Rockets were first used in war in ______ .
【简答题】The ancient Egyptians are supposed ________ rockets to the moon. A) to send B) to be sending C) to have sent D) to have been sending
【简答题】People tend to ignore the delayed effects of exposure to chemical because ________. A) limited exposure to them does little harm to people’s health B) the present is more important for them than the f...
【单选题】Which of the following statements are TURE of limited liability companies?1 The company’s exposure to debts and liability is limited.2 Financial statements must be produced.3 A company continues to ex...
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
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