AM Resit

What is the net ATP yield from one turn of the citric acid cycle?

• 2 ATP

• 1 ATP

• 4 ATP

• 0 ATP

• 3 ATP

Which molecule is the final electron acceptor in aerobic respiration?

• NAD⁺

• CO₂

• Oxygen

• Water

• FAD

Which complexes act as proton pumps in the ETC?

• I, II, IV

• I, III, IV

• II, III, V

• I, II, III

• III, IV, V

Which enzyme directly synthesizes ATP in oxidative phosphorylation?

• Cytochrome c oxidase

• ATP synthase

• NADH dehydrogenase

• Succinate dehydrogenase

• Coenzyme Q reductase

Which shuttle system is used to transfer electrons from cytosolic NADH into mitochondria?

• Malate-aspartate shuttle

• Lactate shuttle

• ATP synthase

• Electron carrier shuttle

• Urea shuttle

Which factor allosterically stimulates isocitrate dehydrogenase?

• ATP

• NADH

• ADP

• FADH₂

• CO₂

Which poison inhibits electron flow at Complex IV of the electron transport chain?

• Rotenone

• Antimycin A

• Cyanide

• Oligomycin

• Malonate

Why does FADH₂ produce less ATP than NADH?

• FADH₂ has more energy

• FADH₂ enters the ETC at Complex II, bypassing Complex I

• FADH₂ binds less oxygen

• FADH₂ is not part of the TCA cycle

• FADH₂ does not interact with ATP synthase

Which enzyme catalyzes the conversion of pyruvate to acetyl-CoA?

• Lactate dehydrogenase

• ATP synthase

• Pyruvate dehydrogenase

• Citrate synthase

• Malate dehydrogenase

What effect does high ATP concentration have on α-ketoglutarate dehydrogenase?

• Activates it

• Inhibits it

• Has no effect

• Binds irreversibly

• Converts it to another enzyme