Multiple choice

The function of electron transport proteins in the thyakoid membrane is the

  1. production of ADP by chemiosmosis

  2. production of NADPH by substrate-level phosphorylation

  3. pumping of hydrogens into the thylakoid space for later generation of ATP by chemiosmosis

  4. pumping of hydrogens into the inner cristae space for the later generation of ATP by chemiosmosis
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C Correct answer
Explanation

During the light-dependent reactions of photosynthesis, electron transport proteins in the thylakoid membrane use the energy from electron flow to pump hydrogen ions (protons) from the stroma into the thylakoid space, creating a gradient for ATP synthesis.

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