Question

During ATP synthesis, protons move "down" their electrochemical gradient through

A. the F0 complex of ATP synthase.
B. the F1 complex of ATP synthase.
C. a proton channel protein.
D. CoQH2-cytochrome c reductase.

Answer 1

During ATP synthesis, protons move through the F0 complex of ATP synthase. The electrochemical gradient, generated by the movement of electrons down the electron transport chain, drives the flow of protons through ATP synthase via a channel protein. Correct option is A.

Step-by-step explanation:

During ATP synthesis, protons move "down" their electrochemical gradient through the F0 complex of ATP synthase. ATP synthase is a complex, molecular machine that uses a proton (H+) gradient to form ATP from ADP and inorganic phosphate (Pi). The electrochemical gradient, established by the movement of electrons down the electron transport chain, drives the flow of protons through ATP synthase via a channel protein.