搜题请搜索小程序“爱下问搜题”
问题 单项选择题

如果T态和R态是某别构酶亚基的可能构象，根据齐变模型，下列哪个是正确的：（）

A.在TT状态时，酶被其底物饱和

B.变构激活剂易与亚基的R态结合

C.变构抑制剂易与亚基的R态结合

D.在底物浓度低时，亚基的R态和T态共存

答案

参考答案：B

问答题 论述题

试述中国文化对武术的影响。
查看答案
单项选择题

Although Damon had ample time earlier in the month to complete the paper he is scheduled to present at a professional conference tomorrow morning, he repeatedly put off doing it. Damon could still get the paper ready in time, but only if he works on it all evening without interruption. However, his seven-year-old daughter’s tap-dance recital takes place this evening, and Damon had promised both to attend and to take his daughter and her friends out for ice cream afterward.
Thus, because of his procrastination, Damon will be forced to choose between his professional and his family responsibilities. The argument proceeds by______.

A．providing evidence that one event will occur in order to establish that an alternative event cannot occur

B．showing that two situations are similar in order to justify the claim that someone with certain responsibilities in the first situation has similar responsibilities in the second situation

C．invoking sympathy for someone who finds himself in a dilemma in order to excuse that person’s failure to meet all of his responsibilities

D．making clear the extent to which someone’s actions resulted in harm to others in order to support the claim that those actions were irresponsible

E．(E) demonstrating that two situations cannot both occur by showing that something necessary for one of those situations is incompatible with something necessary for the other situations
查看答案