A chloroplast has stopped producing ATP and NADPH. Which of the following is most likely causing this? The chloroplast has used up its supply of chlorophyll molecules. Electrons have stopped moving through the electron transport chain. The sun has risen and the chloroplast now can make more chlorophyll. Too much carbon dioxide (CO2) has started moving into the chloroplast.

Question

A chloroplast has stopped producing ATP and NADPH. Which of the following is most likely causing this?   The chloroplast has used up its supply of chlorophyll molecules.   Electrons have stopped moving through the electron transport chain.   The sun has risen and the chloroplast now can make more chlorophyll.   Too much carbon dioxide (CO2) has started moving into the chloroplast.

anonymous · Answer

Electrons have stopped moving through the electron transport chain. I think it's this one because the electrons' final product is NADPH. Also, ATP is produced by the Chemiosis through ATP Synthase. The ATP synthase works due to the Hydrogen gradient. The H+ gradient is formed because the H+ are being moved to the lumen of the thylakoid membrane with the released energy of electrons.