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【单选题】
全民所有制经济，即国有经济，是生产资料和生产成果归( )。A.
社会上的一部分人所共有，由国家占有生产资料的所有制形式
B.
全体人民所公有，由代表全体人民的国家占有生产资料的所有制形式
C.
社会全体人民所公有，由全体人民占有生产资料的所有制形式
D.
社会上的一部分人所共有的所有制形式
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举一反三
【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.
【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".
【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 .
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