Which molecule acts as the terminal electron acceptor in the mitochondrial electron transport chain during aerobic respiration?
Answer and explanation
Correct answer: D. Molecular oxygen (O2)
In aerobic cellular respiration, electrons transferred through Complexes I-IV of the inner mitochondrial membrane are ultimately transferred by cytochrome c oxidase (Complex IV) to molecular oxygen (O2), which combines with protons to form metabolic water (H2O). In the absence of oxygen, electron flow stops.
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