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Where is the respiratory electron transport system (ETS) located in plants?

1. Intermembrane space
2. Mitochondrial matrix
3. Outer mitochondrial membrane
4. Inner mitochondrial membrane

Correct answer: Inner mitochondrial membrane

Solution

In plant mitochondria, the respiratory electron transport system is part of the inner mitochondrial membrane, where complexes I–IV and ATP synthase are located. This placement allows electron flow to drive proton pumping across the membrane.

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