Which statement is not correct? a) In zero-order enzyme reactions, no factor affects the enzyme activity. b) In enzymatic reactions of the second order, the speed is proportional to the sum of the concentration of the two reactants. c) Enzymes affect the rate of chemical reactions by changing the place of the equilibrium position. d) -galactosidase is an example of an enzyme with group specificity.

Which of the following statements is not true? a) The concentration of the enzyme does not affect the equilibrium position of the chemical reaction. b) The concentration of the enzyme affects the rate of establishment of the equilibrium of the chemical reaction. c) Second-order reactions are reactions whose rate is proportional to the sum of the concentrations of the two reactants. d) In zero-order reactions, the rate of a chemical reaction depends on the presence of a catalyst or some other external factor.

Which of the following statements is correct? a) Inhibition by substrate is overcome by decreasing the substrate concentration. b) Allosteric inhibition is an example of irreversible inhibition of enzyme activity. c) In competitive inhibition, the inhibitor affects the active center of the enzyme so that, although binding of the substrate occurs, the course of the reaction is slowed down. d) Copper and mercury compounds cause competitive inhibition of enzyme activity.