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Protons are pumped from the mitochondrial matrix into the

  • A.thylakoid lumen
  • B.nucleus of the cell
  • C.intermembrane space
  • D.cytosol directly

Answer: C

Accumulating there makes the intermembrane space acidic relative to the matrix, and the resulting gradient stores the energy. The narrowness of the space helps the concentration build quickly. A wider space would dilute the protons and weaken the gradient.

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