Electron Transport Chain

What is the role of cytochrome c in the electron transport chain?

• To pump protons

• To transfer electrons between Complex III and Complex IV

• To synthesise ATP

• To reduce oxygen to water

Which molecule donates electrons directly to the electron transport chain at Complex I?

• NADH

• FADH2

• Oxygen

• Water

How many protons are pumped across the inner mitochondrial membrane per NADH molecule oxidized?

• 2

• 4

• 6

• 10

What is the main function of the electron transport chain?

• To produce glucose

• To pump protons and create a proton gradient

• To synthesise proteins

• To break down fatty acids

Which complex in the electron transport chain is also part of the citric acid cycle?

• Complex I

• Complex II

• Complex III

• Complex IV

How many electrons are required to reduce one molecule of oxygen to water?

• 1

• 2

• 4

• 6

What is the final electron acceptor in the electron transport chain?

• Oxygen

• NADH

• FADH2

• Water

Which electron carrier is lipid-soluble and not part of a large respiratory complex?

• Cytochrome c

• Coenzyme Q (ubiquinone)

• NADH

• FADH2

What is the primary function of Complex IV in the electron transport chain?

• To oxidise NADH

• To pump protons and reduce oxygen to water

• To transfer electrons to Complex III

• To synthesise ATP

How many protons are pumped across the inner mitochondrial membrane per FADH₂ molecule oxidized?

• 2

• 4

• 6

• 10