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The light-dependent reactions of photosynthesis occur in the

  • A.cytosol of the cell
  • B.outer chloroplast membrane
  • C.thylakoid membranes
  • D.stroma of the chloroplast

Answer: C

Chlorophyll and the electron carriers sit within those membranes, and protons are pumped into the thylakoid lumen as electrons pass along. The reactions of carbon fixation happen outside them in the stroma. Separating the two stages lets each proceed in its own chemical environment.

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