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Cellular respiration — Lecture 4
3 trusted course sources
Oral-exam practice
Example
The examiner is asking
ExaminerAI
Explain why oxygen is essential for high ATP yield even though glycolysis itself does not directly consume oxygen.
You
Glycolysis makes a little ATP without oxygen, but most ATP comes from the electron transport chain, which needs oxygen at the end.
ExaminerAI
Good start. What happens to NADH and the proton gradient when oxygen is missing?
Partial· Role of oxygen· Follow-up
Missing: NADH re-oxidation; Proton gradient and ATP synthase
What a strong answer should contain
- ✓Direct distinction between glycolysis and oxidative phosphorylation
- ✓Electron acceptor and NADH/NAD⁺ mechanism
- ✓Consequence for the proton gradient and ATP synthase
- ✓Fermentation as the limited alternative