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问题 单项选择题

在跨膜物质转运中，转运体和载体转运的主要区别是

A．转运体转运需直接耗能
B．转运速率有明显差异
C．转运体转运没有饱和现象
D．转运体可同时转运多种物质

答案

参考答案：D

填空题

在盐酸酸化条件下，亚硝酸盐能与N-1-萘基乙二胺盐酸盐发生重氮反应后，与对氨基苯磺酸反应，生成（）色的显色反应。
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单项选择题

"But the doctor can't use just anyone's blood. The donor's blood has to be of a type that won't be destroyed by your blood." This statement means that______.

A．the doctor can't use the donor's blood because your blood can destroy this

B．the doctor has to choose a donor whose blood can not be destroyed by your blood

C．the doctor has to choose a certain type of blood from a donor whose blood will not be destroyed by yours

D．the doctor can choose a certain type of blood from any donors
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