Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. the reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. what is the role of malonic acid with respect to succinate dehydrogenase? a) it is a competitive inhibitor. b) it blocks the binding of fumarate. c) it is a noncompetitive inhibitor. d) it is able to bind to succinate. e) it is an allosteric regulator.