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Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from

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Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from Answer: A proton gradient across the inner mitochondrial membrane

Question context

This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.