Electron-Transferring Flavoprotein:Ubiquinone Oxidoreuctase

The video tutorial by Kevin Tolkoff explores the mitochondrial respiratory chain, focusing on complexes 1, 2, and 2.5. It explains the role of NADH and FADH2 in electron transport, highlighting Complex 2 as succinate dehydrogenase in the TCA cycle. The tutorial introduces electron transferring flavoprotein dehydrogenase and its importance in delivering electrons to coenzyme Q. It also covers beta oxidation and the role of intermediate carriers in reducing ubiquinone to ubiquinol, emphasizing the significance of Complex 2.5 in electron delivery.

Which complexes are primarily discussed in most courses about the mitochondrial respiratory chain?

• Complexes 1, 2, 3, and 4

• Complexes 1, 2, 4, and 5

• Complexes 2, 3, 4, and 5

• Complexes 1, 3, 4, and 5

What is the specific molecule that Complex 2 reacts with in the Krebs cycle?

• Succinate

• FADH2

• NADH

• Coenzyme Q

What is another name for electron transferring flavoprotein dehydrogenase?

• Complex 1

• ETQ oxidoreductase

• Succinate dehydrogenase

• Complex 3

Which enzyme is involved in beta oxidation and contributes electrons to FAD?

• NADH hydrogenase

• Cytochrome c oxidase

• Acyl CoA dehydrogenase

• Succinate dehydrogenase

What role does the electron transferring flavoprotein play in the electron transport chain?

• It pumps protons across the membrane.

• It acts as an intermediate carrier for electrons.

• It directly reduces ubiquinone to ubiquinol.

• It oxidizes NADH to NAD+.

What is the ultimate electron acceptor that gets reduced to ubiquinol?

• Ubiquinone

• Cytochrome c

• FADH2

• NADH

What is the significance of ETQ oxidoreductase in the electron transport chain?

• It is involved in ATP synthesis.

• It directly oxidizes NADH.

• It is a significant source of electrons for reducing ubiquinone.

• It pumps protons across the membrane.