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Biochemistry - Electron Transport Chain - MCAT Practice Questions
Where is the Electron Transport Chain (ETC) located?
Inner mitochondrial membrane
What does the Electron Transport Chain establish to power ATP synthesis?
A proton concentration gradient
Where does the ETC pump protons to create the gradient?
Intermembrane space
Approximately how many ATP molecules are produced when NADH is oxidized by
the ETC?
2.5 ATP
Approximately how many ATP molecules are produced when FADH₂ is oxidized by
the ETC?
1.5 ATP
How many major complexes make up the Electron Transport Chain?
Four complexes
What is the alternative name for Complex I?
NADH dehydrogenase (or NADH Oxidoreductase)
What is the alternative name for Complex II?
Succinate dehydrogenase
Which complex does NOT pump protons across the inner mitochondrial
membrane?
Complex II (Succinate dehydrogenase)
What is the alternative name for Complex III?
Cytochrome reductase
What is the alternative name for Complex IV?
Cytochrome oxidase
What is the final electron acceptor in the Electron Transport Chain during
aerobic respiration?
Oxygen (O₂)
What is produced when oxygen accepts electrons at the end of the ETC?
Water (H₂O)
Complex III is the site of which important process?
The Q Cycle
Which enzyme uses the proton gradient to convert ADP to ATP?
ATP synthase