变构效应(Allosteric effect)
变构效应(Allosteric effect)
变构效应(Allosteric effect)
第6题
Which of the following statements is correct when an assignment (款项让渡) of proceeds has been effected under a documentary credit issued in accordance with UCP 600?
(1)( )The assignee must present complying documents to receive payment.
(2)( )The assignee will receive payment of the proceeds directly from the applicant.
(3)( )The value of the documentary credit is reduced by the amount of the assignment.
(4)( )The beneficiary has assigned its rights to the stated amount of proceeds to the assignee.
第7题
A.变构酶可分为催化部位和调节部位
B.变构酶通过非共价键与变构剂结合
C.变构后变构酶的活性增加
D.变构酶在变构过程中有协同效应
E.变构调节可改变代谢过程的速度和方向
第8题
A.该变构酶是具有负协同效应的变构酶
B.产物随底物浓度的升高而增加
C.变构酶的每个亚基都能与底物结合
D.该变构酶是具有正协同效应的变构酶
第9题
A.变构体与酶分子上的非催化部位结合
B. 使酶蛋白构象发生变化,从而改变酶结构
C. 酶分子多有调节亚基和催化亚基
D. 变构调节都产生正调节,即加快反应速度
E. 变构调节都产生负效应,即降低反应速度
第11题
A、B亚单位与受体结合,使毒素分子变构,进而激活腺苷环化酶
B、A亚单位与受体结合,使毒素分子变构,进而激活腺苷环化酶
C、B亚单位与受体结合,使毒素分子变构,肠粘膜细胞溶解破裂
D、A亚单位与受体结合,使毒素分子变构,肠粘膜细胞溶解破裂