Question

The flow of hydrogen ions down the electrochemical gradient through a channel in the thylakoid membrane provides the energy for ATP production.

a. True
b. False

Answer 1

True

Step-by-step explanation:

The thylakoid membrane of chloroplast has electron carriers embedded in it. During light-dependent reactions of photosynthesis, the electrons move from water molecules to the PSII and then through electron carriers to the PSI and finally to NADP+.

Movement of electrons through the intermediate carrier is accompanied by the pumping of protons from stroma to the thylakoid lumen. This creates an electrochemical gradient along the thylakoid membrane.

The protons are moved back from the thylakoid lumen into the stroma down the concentration gradient through proton channels known as "CFo".

As the protons move down their concentration gradient, the energy is used to phosphorylate the ADP into ATP.