题目内容

酶促反应动力学研究的内容是:

A. 酶浓度、底物浓度对酶促反应速度的影响
B. 温度、pH对酶促反应速度的影响
C.抑制剂、激活剂对酶促反应速度的影响
D.疾病时酶促反应速度的变化

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关于酶促反应速度的正确说法是:

A. 在底物浓度无限小时,增加酶浓度能加快反应速度
B. 酶促反应速度取决于酶-底物复合物分解为酶和产物的速度
C. 随着底物浓度的升高,反应速度趋向于恒定
D. 随着底物浓度的升高,反应速度保持直线上升的关系

敌敌畏中毒:

A. 使体内含羟基的酶失活
B. 使体内含巯基的酶失活
C. 可用解磷啶解毒
D. 可用BAL(二巯基丙醇)解毒

He was an old man who fished alone in a skiff in the Gulf Stream and he had gone __1_ days now without taking a fish. In the first forty days a __2_ had been with him. But after forty days without a fish the boy’s _3 had told him that the old man was now definitely and finally _4__, which is the worst form of unlucky, and the boy had gone at their orders in another boat which caught _5___ good fish the first week.

“But remember how you went __1 days without fish and then we caught big ones every day for three weeks.”“I remember,“ the old man said. “I know you did not leave me because you 2_.”“It was _3_ made me leave. I am a boy and I must obey him.”“I know,“ the old man said. “It is quite normal.”“He hasn’t much _4.”“No,” the old man said. “But we have. Haven’t we?”“Yes,” the boy said. “Can I offer you a beer on the Terrace and then we’ll take the stuff home.”“Why not?“ the old man said. “Between 5__.”