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【单选题】
某商店在某一时间以每件50元的价格卖出两件衣服,其中一件盈利25%,另一件亏损25%,在这次买卖中,该家商店( )
A.
亏损 6.7 元
B.
盈利 6.7 元
C.
不亏不盈
D.
以上都不正确
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【单选题】混凝土的砂率越大,则混凝土的流动性越( )
A.
越差
B.
越好
C.
不变
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【单选题】Which of the following statements is false with respectto an enzyme's ability to catalyse a reaction?
A.
An enzyme provides a reaction surface and a suitable environment for the reaction to take place.
B.
An enzyme binds reactants such that they are positioned correctly and can attain their transition-st
C.
An enzyme allows the reaction to go through a less stable transition state than would normally be th
D.
An enzyme can weaken bonds in reactants through the binding process.
查看完整题目与答案
【单选题】Which of the following statements about enzyme-linked receptor is false ?
A.
An enzyme-linked receptor is a transmembrane domain receptor, where the binding of an extracellular ligand causes enzymatic activity on the intracellular side.
B.
A enzyme-linked receptor has an extracellular ligand-binding domain, a transmembrane domain, and an intracellular catalytic (enzyme) domain.
C.
The signal transduction pathways of enzyme-linked receptor involve phosphorylation cascades.
D.
Enzyme-linked receptor interacts with an intracellular protein called a "G-protein".
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【简答题】2019 年12月31日,在二〇二〇年新年贺词中指出,一年来,国防和只是推进,人民展现出新时代强军风貌。我们进行国庆大阅兵,举行()、空军成立70周年庆祝活动,举办第七届世界军人运动会。首艘国产航母“()舰”正式列装。我们为共和国70周年的辉煌成就喝彩,被()的硬核力量震撼。2019年中国继续张开双臂拥抱世界。我们主办了()“一带一路”国际合作高峰论坛、北京世界园艺博览会...
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【单选题】混凝土的砂率越大,则混凝土的流动性越( )
A.
越差
B.
越好
C.
不变
D.
无影响
查看完整题目与答案
【单选题】Which statement about enzyme-catalyzed reactions is FALSE?
A.
At saturating levels of substrate, the rate of an enzyme-catalyzed reaction is proportional to the enzyme concentration.
B.
If enough substrate is added, the normal V max of a reaction can be attained even in the presence of a competitive inhibitor.
C.
The rate of a reaction decreases steadily with time as substrate is depleted.
D.
The activation energy for the catalyzed reaction is the same as for the uncatalyzed reaction, but the equilibrium constant is more favorable in the enzyme-catalyzed reaction.
E.
The Michaelis-Menten constant K m equals the [S] at which V = 1/2 V max .
查看完整题目与答案
【单选题】混凝土的砂率越大,则混凝土的流动性越( )。
A.
越差
B.
越好
C.
不变
D.
无
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【简答题】材料：鸦片战争一声炮响，改变了古老中国的历史命运，西方列强的坚船利炮把中国推向灾难的深渊。面对苦难的中国，先贤们不懈斗争、上下求索，经历了从“师夷长技”到“实业救国”、变法维新的探索，人们发现温和的改良无法从根本上改变中国落后挨打的现实，必须彻底埋葬旧制度。于是，人们举旗，发动革命，推翻旧王朝，建立了亚洲第一个共和国。接着，又请来德、赛两位先生，挥动科学、民主大旗，吹响了思想解放的号角……。请...
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【单选题】Which of the following statements is incorrect regarding Enzyme induction
A.
Enzyme induction induces P450 expression by enhancing the rate of its synthesis
B.
Enzyme induction induces P450 expression by reducing its rate of degradation
C.
Enzyme induction usually results in a decrease in the pharmacologic action of the inducer and also of co-administered drugs
D.
Enzyme induction cannot exacerbate metabolite-mediated toxicity
E.
Environmental chemicals and pollutants are also capable of inducing P450 enzymes
查看完整题目与答案
【单选题】Which statement is correct about enzyme ?
A.
All the proteins have the enzymatic activity
B.
It always needs specific cofactor to be activated
C.
Enzyme display enormous catalytic power
D.
It has the absolute specificity to recognize the substrate
查看完整题目与答案
相关题目：
【单选题】混凝土的砂率越大,则混凝土的流动性越( )
A.
越差
B.
越好
C.
不变
查看完整题目与答案
【单选题】Which of the following statements is false with respectto an enzyme's ability to catalyse a reaction?
A.
An enzyme provides a reaction surface and a suitable environment for the reaction to take place.
B.
An enzyme binds reactants such that they are positioned correctly and can attain their transition-st
C.
An enzyme allows the reaction to go through a less stable transition state than would normally be th
D.
An enzyme can weaken bonds in reactants through the binding process.
查看完整题目与答案
【单选题】Which of the following statements about enzyme-linked receptor is false ?
A.
An enzyme-linked receptor is a transmembrane domain receptor, where the binding of an extracellular ligand causes enzymatic activity on the intracellular side.
B.
A enzyme-linked receptor has an extracellular ligand-binding domain, a transmembrane domain, and an intracellular catalytic (enzyme) domain.
C.
The signal transduction pathways of enzyme-linked receptor involve phosphorylation cascades.
D.
Enzyme-linked receptor interacts with an intracellular protein called a "G-protein".
查看完整题目与答案
【简答题】2019 年12月31日,在二〇二〇年新年贺词中指出,一年来,国防和只是推进,人民展现出新时代强军风貌。我们进行国庆大阅兵,举行()、空军成立70周年庆祝活动,举办第七届世界军人运动会。首艘国产航母“()舰”正式列装。我们为共和国70周年的辉煌成就喝彩,被()的硬核力量震撼。2019年中国继续张开双臂拥抱世界。我们主办了()“一带一路”国际合作高峰论坛、北京世界园艺博览会...
查看完整题目与答案
【单选题】混凝土的砂率越大,则混凝土的流动性越( )
A.
越差
B.
越好
C.
不变
D.
无影响
查看完整题目与答案
【单选题】Which statement about enzyme-catalyzed reactions is FALSE?
A.
At saturating levels of substrate, the rate of an enzyme-catalyzed reaction is proportional to the enzyme concentration.
B.
If enough substrate is added, the normal V max of a reaction can be attained even in the presence of a competitive inhibitor.
C.
The rate of a reaction decreases steadily with time as substrate is depleted.
D.
The activation energy for the catalyzed reaction is the same as for the uncatalyzed reaction, but the equilibrium constant is more favorable in the enzyme-catalyzed reaction.
E.
The Michaelis-Menten constant K m equals the [S] at which V = 1/2 V max .
查看完整题目与答案
【单选题】混凝土的砂率越大,则混凝土的流动性越( )。
A.
越差
B.
越好
C.
不变
D.
无
查看完整题目与答案
【简答题】材料：鸦片战争一声炮响，改变了古老中国的历史命运，西方列强的坚船利炮把中国推向灾难的深渊。面对苦难的中国，先贤们不懈斗争、上下求索，经历了从“师夷长技”到“实业救国”、变法维新的探索，人们发现温和的改良无法从根本上改变中国落后挨打的现实，必须彻底埋葬旧制度。于是，人们举旗，发动革命，推翻旧王朝，建立了亚洲第一个共和国。接着，又请来德、赛两位先生，挥动科学、民主大旗，吹响了思想解放的号角……。请...
查看完整题目与答案
【单选题】Which of the following statements is incorrect regarding Enzyme induction
A.
Enzyme induction induces P450 expression by enhancing the rate of its synthesis
B.
Enzyme induction induces P450 expression by reducing its rate of degradation
C.
Enzyme induction usually results in a decrease in the pharmacologic action of the inducer and also of co-administered drugs
D.
Enzyme induction cannot exacerbate metabolite-mediated toxicity
E.
Environmental chemicals and pollutants are also capable of inducing P450 enzymes
查看完整题目与答案
【单选题】Which statement is correct about enzyme ?
A.
All the proteins have the enzymatic activity
B.
It always needs specific cofactor to be activated
C.
Enzyme display enormous catalytic power
D.
It has the absolute specificity to recognize the substrate
查看完整题目与答案