Practice Exams › AP Biology — Cell Respiration › Question #20
High-School-Ap Biology
In aerobic respiration, the final electron acceptor in the electron transport chain is:
1
Oxygen (O2)
✓ Correct Answer

Explanation

Molecular oxygen (O2) accepts electrons at Complex IV, forming water. Without O2 the ETC backs up and the cell falls back to fermentation. AP Biology CED Topic 3.7.

📄 Source: https://apcentral.collegeboard.org/courses/ap-biology/course

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