The direction of the proton current in the chloroplast F₁Fₒ ATP synthase during ATP synthesis is from
A) stroma to cytoplasm.
B) cytoplasm to stroma.
C) lumen to stroma.
D) stroma to lumen.
E) one thylakoid to another through their lumen.

Question

Quizplus · Accepted Answer

During ATP synthesis, the direction of the proton current in the chloroplast F₁Fₒ ATP synthase is from the lumen to the stroma. This is because protons accumulate in the lumen during electron transport, creating a proton gradient, which drives protons through the F₁Fₒ ATP synthase from the lumen to the stroma. This movement of protons drives the synthesis of ATP from ADP and inorganic phosphate.

The Direction of the Proton Current in the Chloroplast F₁Fₒ