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Sagot :
Answer:
a. NADH
b. Ubiquinone
c. Cytochrome c
d. Oxygen
e. F0 subunit
f. F1 subunit
Explanation:
Electrons enter the Electron Transport Chain (ETC) from Nicotinamide Adenine Dinucleotide (NADH), which is an electron donor generated during different catabolic reactions (e.g., glucose oxidation). Ubiquinone or 'Coenzyme Q' is an electron acceptor that accepts electrons from both Complex I and Complex II and donates electrons to Complex III. The oxygen (O) is the final electron acceptor that accepts the electrons after they have passed through the ETC and ATPase. Complex III (also known as Ubiquinol-cytochrome c oxidoreductase) catalyzes the electron transfer from ubiquinol to Cytochrome c, which is coupled to proton translocation across the membrane. The F0 subunit of the ATP synthase forms a channel (embedded in the mitochondrial membrane) through which protons can flow. Moreover, the F1 subunit of the ATP synthase uses the energy released by the proton electrochemical gradient to drive the synthesis of ATP.
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