If the Delta G degree of the reaction A rightarrow B is -40 kJ/mol, under standa

Question

If the Delta G degree of the reaction A rightarrow B is -40 kJ/mol, under standard conditions the reaction: A) is at equilibrium. B) will never reach equilibrium. C) will not occur spontaneously. D) will proceed at a rapid rate. E) will proceed spontaneously from A to B The hydrolysis of ATP has a large negative Delta G degree; nevertheless it is stable in solution due to A) entropy stabilization. B) ionization of the phosphates. C) resonance stabilization. D) the hydrolysis reaction being endergonic. E) the hydrolysis reaction having a large activation energy. 3) Enzymes are potent catalysts because they: A) are consumed in the reactions they catalyze. B) are very specific and can prevent the conversion of products back to substrates. C) drive reactions to completion while other catalysts drive reactions to equilibrium. D) increase the equilibrium constants for the reactions they catalyze. E) lower the activation energy for the reactions they catalyze. The role of an enzyme in an enzyme-catalyzed reaction is to: A) bind a transition state intermediate, such that it cannot be converted back to substrate. B) ensure that all of the substrate is converted to product. C) ensure that the product is more stable than the substrate. D) increase the rate at which substrate is converted into product. E) make the free-energy change for the reaction more favorable. Which off the following statements is false? A) A reaction may not occur at a detectable rate even though it has a favorable equilibrium. B) After a reaction, the enzyme involved becomes available to catalyze the reaction again. C) For S rightarrow P, a catalyst shifts the reaction equilibrium to the right. D) Lowering the temperature of a reaction will lower the reaction rate. E) Substrate binds to an enzyme's active site. Which of the following statements about a plot of V_0 vs. [S] for an enzyme that follows Michaelis false? A) As[S] increases, the initial velocity of reaction V_0 also increases. B) At very high [S], the velocity curve becomes a horizontal line that intersects the y-axis at K_m. C) K_m is the [S] at which V_0 = 1/2 V_max. D) The shape of the curve is a hyperbola. E) The y-axis us a rate term with units of mu m/min.

Explanation / Answer

Ans 1 E. Will proceed spontaneously from A to B

The gibbs free energy change associated with the reaction is given as -40kJ/mol . The negative sign indicates that the products are more stable having less energy than reactants. Such reactions are favourable and occur spontaneously in forward direction.

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