问题
单项选择题 A1/A2型题
下列关于酶促反应的特点，错误的是（）
A.具有极高的效率
B.绝对特异性
C.相对特异性
D.立体异构特性
E.不可调节性
答案
参考答案：E
解析：酶促反应具有极高的效率。具有高度的特异性，分为：绝对特异性；相对特异性；立体异构特性。酶促反应具有可调节性。
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下列关于酶促反应的特点，错误的是（）
A.具有极高的效率
B.绝对特异性
C.相对特异性
D.立体异构特性
E.不可调节性
参考答案：E
解析：酶促反应具有极高的效率。具有高度的特异性，分为：绝对特异性；相对特异性；立体异构特性。酶促反应具有可调节性。
| Mr. Faugel was convinced that student nervousness had affected their scores; to reduce the anxiety of these students who had already been tested, he gave 22 of them a beta blocker before readministration of the test. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nation-wide had average improvements which were similar to those in Faugel’s non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers. |
Beta blockers work on some physical and emotional symptoms because they
A．fool a person into a healthier stance.
B．interfere with the effects of adrenalin.
C．produce side effects worse than fine symptoms.
D．primarily change human thought processes.