Multiple choice

Protons (H+) accumulate in the thylakoid space during electron transport between photosystem I and II. The extra protons in the thylakoid space ___________________.

  1. enter the photorespiration pathway

  2. convert NADP to NADPH and generate ATP in the process

  3. are small enough to diffuse back out through the lipid bilayer

  4. raise the pH of the space until the processes stop

  5. move from the thylakoid space to the stroma through an ATP synthase complex channel that generates ATP
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