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Discussion

In a chloroplast, protons accumulate during the light reactions in the

  • A.intermembrane space
  • B.cytosol of the cell
  • C.thylakoid lumen
  • D.stroma outside the thylakoids

Answer: C

The gradient therefore runs across the thylakoid membrane, with the lumen acidic. In a mitochondrion the corresponding gradient sits across the inner membrane instead. The principle is the same in both organelles even though the geometry differs.

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