Which of the following statements describes the function of the electron transport chain (ETC) in photosynthesis?
A) As electrons move through the ETC, they release energy that is used to concentrate protons in the thylakoid lumen.
B) As electrons move through the ETC, they catalyze the formation of ATP.
C) The ETC releases CO₂ from glucose.
D) The ETC captures and stores the electrons given off by NADPH.

Question

Quizplus · Accepted Answer

The electron transport chain (ETC) in photosynthesis serves to pump protons from the stroma to the thylakoid lumen, creating a concentration gradient that is used to drive the production of ATP. As electrons move through the ETC, they release energy that is used to transport protons across the thylakoid membrane. This energy is then harnessed by ATP synthase to produce ATP. The ETC does not release CO₂ from glucose, nor does it capture and store the electrons given off by NADPH.

Which of the Following Statements Describes the Function of the Electron