During oxidative phosphorylation in aerobic cellular respiration, which component of the mitochondrion builds up a high concentration gradient of protons (H⁺) to drive ATP synthesis via ATP synthase?

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A Mitochondrial matrix
B Intermembrane space
C Outer mitochondrial membrane
D Cytosol of the cell

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Answer: B. Intermembrane space

Correct Answer: B) Intermembrane space
Detailed Solution:
1. Mechanism of the ETC: As high-energy electrons pass through the electron transport chain (ETC) embedded in the inner mitochondrial membrane, the complexes use that energy to pump protons (H⁺) out of the matrix.

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During oxidative phosphorylation in aerobic cellular respiration, which component of the mitochondrion builds up a high concentration gradient of protons (H⁺) to drive ATP synthesis via ATP synthase?

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