Question

In mitochondrion, complex II, also called ________, which is located in ________, not only transports electrons in the electron transport chain but also catalyzes a reaction in ________?

Answer 1

In the mitochondrion, complex II, known as succinate dehydrogenase, is found in the inner mitochondrial membrane. It transports electrons in the electron transport chain and also catalyzes a reaction in the Krebs cycle.

Step-by-step explanation:

In mitochondrion, complex II, also called succinate dehydrogenase, is located in the inner mitochondrial membrane, and it not only transports electrons in the electron transport chain but also catalyzes a reaction in the Krebs cycle, also known as the citric acid cycle. Unlike complexes I, III, and IV, complex II does not pump protons from the matrix to the intermembrane space, therefore, it does not directly contribute to the generation of the proton gradient used for ATP synthesis. Instead, it participates in both the electron transport chain by transferring electrons from FADH2 to coenzyme Q, and in the Krebs cycle by converting succinate to fumarate.