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6. Electron movement results in the establishment of a proton gradient across the inner mitochondrial membrane. The proton motive force then provides the energy for ATP formation. a. How are protons shifted from the matrix to the intramembrane space? b. How is the proton gradient harnessed for ATP formation? c. How does ATP reach the cellular compartment/s where biosynthesis is occurring?

Question

  1. Electron movement results in the establishment of a proton gradient across the inner mitochondrial membrane. The proton motive force then provides the energy for ATP formation. a. How are protons shifted from the matrix to the intramembrane space? b. How is the proton gradient harnessed for ATP formation? c. How does ATP reach the cellular compartment/s where biosynthesis is occurring?
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Solution

a. Protons are shifted from the matrix to the intramembrane space through the process of electron transport chain. This process involves a series of protein complexes located in the inner mitochondrial membrane, known as Complex I, II, III, and IV. As electrons are passed along these complexes, energy is released and used to pump protons (H+ ions) from the matrix into the intermembrane space, creating a proton gradient.

b. The proton gradient is harnessed for ATP formation through a process called chemiosmosis. This process involves a protein complex called ATP synthase, which is also located in the inner mitochondrial membrane. As protons flow back down their concentration gradient from the intermembrane space into the matrix, they pass through ATP synthase. The energy released by this flow is used to combine ADP and inorganic phosphate to form ATP.

c. ATP reaches the cellular compartments where biosynthesis is occurring through facilitated diffusion. ATP is a large, charged molecule, so it cannot easily cross the hydrophobic interior of the lipid bilayer. Instead, it is transported out of the mitochondria and into the cytosol by specific transport proteins. From there, it can reach other parts of the cell where it is needed.

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