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 Vmax 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 Km equals the [S] at which V = 1/2 Vmax.

Explanation / Answer

FALSE 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.

A enzymes job is to lower the activation energy so the reaction can proceed at a faster rate.

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