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Unformatted text preview: inner mitochondrial membrane. The events of the citric acid cycle and oxidative phosphorylation take place in the matrix. Figure %: Mitochondrial Structure. The outer membrane of the mitochondria is largely permeable and allows many molecules to freely diffuse across it. The inner membrane, on the other hand, is highly impermeable, only allowing water, carbon dioxide, and oxygen to freely cross it. This membrane contains specific proteins that can act as transporters of specific molecules such as ATP and pyruvate. Because only specific molecules are allowed to cross the inner mitochondrial membrane, an imbalance, or gradient, can develop between one side of the membrane versus the other. Molecules that cannot freely pass through the inner membrane must be specifically transported in order to cross. We will see how the mitochondria uses gradients to produce ATP in oxidative phosphorylation....
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