A figure shows a thylakoid membrane with the lumen on one side and the stroma on the other. Water is split on the lumen side. NADP reductase works on the stroma side. An enzyme complex has one part (F0) embedded in the membrane, forming a channel, and another part (F1) projecting into the stroma. Which statement about the figure is correct?
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Protons build up inside the lumen because of water splitting, proton pumping during electron transport and NADP reduction on the stroma side. The gradient drives protons back through the F0 channel, and F1 on the stroma side makes ATP.
- A.
Splitting water and pumping protons by the electron carriers raise the proton level inside the lumen. F1, where ATP is made, faces the stroma.
- B.
The proton gradient is built by pumping into the lumen. ATP is made when protons flow back out through the F0 channel.
- D.
NADP reductase removes protons from the stroma to reduce NADP+, which lowers the proton level in the stroma.
NCERT: Class 11 Biology, Chapter 11