Question

In a biological reaction, succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, a substance that resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the amount of succinate molecules to those of malonic acid reduces the inhibitory effect if malonic acid. Select the correct identification of the molecules described in the reaction.

A. Succinate dehydrogenase is the enzyme, and fumarate is the substrate in the reaction.
B. Fumarate is the product, and malonic acid is a noncompetitive inhibitor in the reaction.
C. Succinate dehydrogenase is the enzyme, and malonic acid is the substrate in the reaction.
D. Succinate is the substrate, and fumarate is the product in the reaction.

Answer 1

D) option is correct

Step-by-step explanation:

During citric acid cycle, Acetyl Coenzyme A is completely oxidized in form of CO2 and produce NADH, FADH2 and GTP (ATP)

Succinate is converted to fumarate with the help of succinate dehydrogenase and FADH2 is produced during this step

In the given conditions, if the amount of succinate is increased in comparison to malonic acid then it reduces the effect of malonic acid, therefore malonic acid will not be able to inhibit the conversion of succinate to fumarate and hence succinate will be the substrate and fumarate, the product in the reaction