Which of these statements about enzyme-catalyzed reactions is false? A. At satur

Question

Which of these statements 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 Michelis-Menten constant K_m equals the [S] at which V = 12 V_max. The double-reciprocal transformation of the Michaelis-Menten equation, also called the Lineweaver-Burk plot, is given by I/V_0 = K_m/(V_max[S]) + I/V_max. To determine K_m from a double-reciprocal plot you would: A. Multiply the reciprocal of the x-axis intercept by -1. B. Multiply the reciprocal of the y-axis intercept by -1. C. Take the reciprocal of the x-axis intercept. D. Take the reciprocal of the y-axis intercept. E. Take the x-axis intercept where V_0 = 1/2 V_max. The anaerobic conversion of 1 mol of glucose to 2 of lactate by fermentation is accompanied by a net gain of: A. 1 mol of ATP. B. 1 mol of NADH. C> 2 mol of ATP. D. 2 mol of NADH. E. None of the above. In glycolysis, fructose 1, 6-bisphosphate is converted to two products with a standard free-energy change (Delta G^infinity) of 23.8 kJ/mol. Under what conditions (encountered in a normal cell) will the free-energy change (Delta G) be negative, enabling the reaction to proceed to the right? A. If the concentrations of the two products are high relative to fructose 1, 6-bisphosphate. B. The reaction will not go to the right spontaneously under any conditions because the Delta G^infinity is positive. C. Under standard conditions, enough energy is released to drive the reaction to the right. D. When there is a high concentration of fructose 1, 6-bisphosphate relative to the concentration of products. E. When there is a high concentration of products relative to the concentration of fructose 1, 6-bisphosphate.

Explanation / Answer

6) Stataement D is false, for a catalysed reaction the substrate can easily climb the potential energy hill because of a decrerase in activation energy.

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