1) Which of the following statements is true of enzyme catalysts? More than one answer may apply, but be warned that you will get a 25% deduction of the total points for wrong answers. Select one or more:
a. To be effective, they must be present at the same concentration as their substrate.
b. They can increase the equilibrium constant for a given reaction by a thousand-fold or more.
c. They lower the activation energy for conversion of substrate to product.
d. Their catalytic activity is independent of pH.
e. They are generally equally active on D and L isomers of a given substrate.
2) Which one of the following parameters remains the same for a reaction, whether the reaction is enzyme-catalyzed or uncatalyzed? Select one:
a. kcat
b. k-1
c. KD
d. ΔG
3) Which of the following statements is FALSE? Select one:
a. A reaction may not occur at a detectable rate of reaction even though it has a favorable equilibrium constant.
b. At the end of an enzyme-catalyzed reaction, the functional enzyme becomes available to catalyze the reaction again.
c. For substrate being converted to product, a catalyst shifts the reaction equilibrium to the right.
d. Lowering the temperature of a reaction will lower the reaction rate.