尿素水解反应CO(NH2)2+H2O→2NH3+CO2,在373K时为一级反应,速率常数为4.20×10-5s-1。若为尿素酶催化,在310K时,其速率常数为7.58×104s-1。已知无酶和有酶反应的活化能分别为134kJ·mol-1和43.9kJ·mol-1。试计算非酶催化反应按310K时酶催化反应的速率进行所需要的温度。
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辅酶ASH和乙酰氯反应,可以制备重要的生物化学中间体乙酰辅酶A。该反应为二级反应,两个反应物的起始浓度都是1
A.directionB.introductionC.decisionD.education
A. direction
B. introduction
C. decision
D. education
Those who are likely to doubt their parents’values and ways of doing things are proba-bly__________ .
A. the Japanese
B. the Americans
C. both the Japanese and the Americans
D. neither the Japanese nor the Americans
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A. hear of
B. attend
C. hear from
D. listen