Which of the Following Enzymes is NOT a Flavoprotein

Question

Which of the following enzymes is NOT a flavoprotein?
A)NADH-CoQ reductase
B)succinate dehydrogenase
C)coenzyme Q-cytochrome c oxidoreductase
D)fatty acyl-CoA dehydrogenase-transferring protein

Accepted Answer

Coenzyme Q-cytochrome c oxidoreductase, also known as Complex III in the electron transport chain, is not classified as a flavoprotein. Flavoproteins are proteins that contain a nucleic acid derivative of riboflavin: the flavin adenine dinucleotide (FAD) or flavin mononucleotide (FMN). NADH-CoQ reductase (Complex I), succinate dehydrogenase (Complex II), and fatty acyl-CoA dehydrogenase are examples of enzymes that use FAD or FMN as a cofactor, making them flavoproteins. Complex III, however, does not use FAD or FMN as a cofactor, distinguishing it from the others listed.