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【单选题】
干青种翡翠主要组成矿物为:A.
透闪石
B.
辉石和透闪石
C.
硬玉和钠钙闪石
D.
绿辉石
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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 .
【单选题】In India, LG has
A.
extended 30% of the air-conditioner market.
B.
increased 21% of washing machine sales.
C.
taken 19% of color-TV business.
D.
gained GSM mobile phone market.
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