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【单选题】
社会主义核心价值观在国家层面的价值要求是( )A.
富强、民主、文明、和谐
B.
自由、平等、公正、法治
C.
爱国、敬业、诚信、友善
D.
共商、共建、共享、共赢
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举一反三
【单选题】下列关于非竞争性抑制的叙述不正确的是 (
A.
与酶活性中心以外的其他位点结合
B.
可干扰酶和底物的结合
C.
底物与抑制剂之间不存在 竞争关系
D.
抑制作用的强弱取决于抑制剂的浓度
E.
不能通过增加底物浓度减弱抑制作用
【单选题】_____________ rely on ___________, such as Ca2+, cyclic GMP, phosphatidylinositol, and cyclic AMP, to activate (or inactivate) a variety of pathways within the cell.
A.
Intracellular receptors; ligands
B.
G-protein-coupled receptors; second messengers
C.
enzyme-linked receptor; G-proteins
D.
G-protein-coupled receptors; G-proteins
【单选题】关于非竞争性抑制的叙述,正确的是:
A.
抑制剂与酶活性中心结合
B.
抑制剂与活性中心以外的部位结合
C.
抑制剂与底物结合
D.
抑制剂与辅酶结合
E.
抑制剂与酶-底物复合物结合
【多选题】下列关于非竞争性抑制的叙述正确的是
A.
与酶活性中心以外的其他位点结合
B.
可干扰酶和底物的结合
C.
底物与抑制剂之间不存在竞争关系
D.
抑制作用的强弱取决于抑制剂的浓度
E.
不能通过增加底物浓度减弱抑制作用
【简答题】Excessive sugar has a strong mal-effect on the functioning of active【46】o______such as the heart, kidneys and the brain. Shipwrecked sailors who ate and drank nothing but sugar for nine days surely we...
【简答题】You should spend about 20 minutes on Questions 14-26 which are based on Reading Passage 2 below. Saving bugs to find new drugs Zoologist Ross Piper looks at the potential of insects in pharmaceutical ...
【简答题】It has long been recognized both home and abroad that traditional Chinese arts, such as calligraphy, painting, opera, and literature are glaring with beauty and excellence. In recent years, however, m...
【简答题】The induced fit hypothesis suggests that the binding of the substrate to the enzyme alters the structure of the enzyme, placing some strain on the substrate and further facilitating thereaction. Cofac...
【简答题】In English, the phoneme/p/is pronounced differently in words such as pat, spat, or tap. Can you form. a rule that can generalize this linguistic phenomenon?（南开大学2010研)
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