Ch. 15 Lehninger biochem test bank Rated 100% Correct!!
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Ch. 15 Lehninger biochem
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Ch. 15 Lehninger Biochem
1. Which of the following does not contribute to the regulation of enzymatic activity?
A) Protein phosphorylation
B) Allosteric regulation
C) Protein stability
D) mRNA stability
E) DNA stability - E
2. For an enzyme to effectively change its activity in response to a change in substrate conce...
Ch. 15 Lehninger biochem test bank 1. Which of the fol lowing does not contribute to the regulation of enzymatic activity? A) Protein phosphorylation B) Allosteric regulation C) Protein stability D) mRNA stability E) DNA stability - ✔✔E 2. For an enzyme to effectively change its activity in response to a change in substrate concentration, it is most favorable for: A) Km to be less than cellular substrate concentrations. B) Km to be equal to cellular substrate concentrations. C) Km to be greater than cellular substrate concentrations. D) Vmax to be at the diffusion limit. E) The substrate to also be an allosteric effector. - ✔✔E 3. Reaction steps that are far from equilibrium are good control points in metabolic pathways because A) the n et flux through those steps is easily reversed. B) the rate differences between the forward and reverse steps are often small. C) these reactions occur most frequently in the cell. D) these reactions are highly endergonic. E) these reactions are highly exe rgonic. - ✔✔E 4. Aside from maintaining the integrity of its hereditary material, the most important general metabolic concern of a cell is: A) keeping its glucose levels high. B) maintaining a constant supply and concentration of ATP . C) preserving its ability to carry out oxidative phosphorylation. D) protecting its enzymes from rapid degradation. E) running all its major metabolic pathways at maximum efficiency. - ✔✔B 5. The most sensitive indicator of the energetic status of the cell is the concentration of A) AMP . B) ADP . C) ATP . D) cAMP . E) glucose. - ✔✔A 6. If the mass action ratio, Q, for a reaction under cellular conditions is larger than the equilibrium constan t, Keq, then: A) the reaction will be at equilibrium. B) the reaction will go backward and be endergonic. C) the reaction will go backward and be exergonic. D) the reaction will go forward and be endergonic. E) the reaction will go forward and be exergon ic. - ✔✔C 7. Which one of the following types of mechanisms is not known to play a role in the reversible alteration of enzyme activity? A) Activation by cleavage of an inactive zymogen B) Allosteric response to a regulatory molecule
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