Pumping of protons (H⁺) across the inner membrane of the mitochondrion folded into cristae, between the matrix of the mitochondrion and the mitochondrion's intermembrane space, occurs for chemiosmosis of:
Correct answer: A. Oxidative phosphorylation
- A. Oxidative phosphorylation
- B. Cyclic photophosphorylation
- C. Photophosphorylation
- D. Non-cyclic photophosphorylation
Explanation
The correct answer is oxidative phosphorylation. This process takes place in the mitochondria, specifically across its inner membrane, where protons (H⁺) are pumped into the intermembrane space, creating a gradient used by ATP synthase to produce ATP. The context of mitochondria and the electron transport chain helps identify this process. The other options, cyclic photophosphorylation, photophosphorylation, and non-cyclic photophosphorylation, all refer to processes in chloroplasts related to photosynthesis, not cellular respiration.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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