Chemiosmosis is a part of oxidative phosphorylation, the final step in cellular respiration. Which of the following is true regarding chemiosmosis?
A. The energy from a proton gradient is used to make ATP
B. Chemiosmosis regenerates electron carriers like NADH and FAHD
C. ATP synthesis creates a proton gradient that causes electron flow through an electron transport chain (ETC).
D. A temperature gradient drives ATP synthesis.

Chemiosmosis is a process where proton motive force generated through the flow of electrons in the electron transport chain leads to the production of the ATP in cell .

The Chemiosmosis takes place in both plants in chloroplast and in animals in respiration. The enzyme involved in the process of [photosynthesis is called ATP synthase which changes its conformation in response to the movement of protons through F₀ particle and forms ATP from ADP.

Thus, option-A is the correct answer.