Electron Transport Chain

Question 0

How many protein complexes in the ETC?

Answer 0

4

Question 1

Why is the electron transport chain so important?

Answer 1

It extracts all the potential energy in NADH and FADH2 which allows it to synthesize more ATP

Question 2

How much ATP is produced in the ETC?

Answer 2

32 or 34

Question 3

What is the last protein complex used to pull H+ back across the inner membrane called?

Answer 3

ATP synthase

Question 4

How do protein complexes I, III, IV pull electrons through the ETC?

Answer 4

They are arranged in increasing electronegativity to pull the electrons along

Question 5

What role does oxygen play in the ETC?

Answer 5

Oxygen is the final electron acceptor, pulling electrons from complex IV. This allows the flow of electrons to continue and H+ to continue being pumped through the inner membrane.

Question 6

Describe chemiosmosis.

Answer 6

Chemiosmosis uses the build up force (high gradient, charged protons) to move H+ through ATP synthase providing the energy needed to phosphorylate ATP

Question 7

Why does NADH produce more ATP than FADH2?

Answer 7

FADH2 is oxidized, and passes its electrons to the ETC further down the chain, resulting in fewer H+ being pumped across.