Succinate Dehydrogenase Catalyzes the Conversion of Succinate to Fumarate

question 39

Multiple Choice

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.The effect of malonic acid on the activity of succinate dehydrogenase suggests which of the following?

• A)Malonic acid is a noncompetitive inhibitor.
• B)Malonic acid is a competitive inhibitor.
• C)Malonic acid blocks the binding of fumarate.
• D)Malonic acid is an allosteric regulator.

---

Definitions:

Misery Index

An economic indicator created by adding the unemployment rate to the inflation rate, intended to measure economic discomfort.

Year

A period of time equal to 365 days, or 366 in leap years, used for calculating time in calendar terms.

Recession

An interim period of economic fallback, where there’s a noticeable dip in commercial and industrial outputs, customarily marked by a decrease in GDP in two successive quarters.

Depression

a severe and prolonged downturn in economic activity, characterized by significant fall in spending and high unemployment.