Which of the following most accurately describes what is happening along the electron transport chain in Figure 7.2?
A) Chemiosmosis is coupled with electron transfer.
B) Each electron carrier alternates between being reduced and being oxidized.
C) ATP is generated at each step.
D) Energy of the electrons increases at each step.
E) Molecules in the chain give up some of their potential energy.

Question

Quizplus · Accepted Answer

Along the electron transport chain, each electron carrier alternates between being reduced (accepting electrons) and being oxidized (donating electrons), creating a flow of electrons through the chain. This flow of electrons is what drives the pumping of protons across the membrane, creating a proton gradient and allowing chemiosmosis to occur, ultimately generating ATP. The energy of the electrons does not increase at each step; rather, molecules in the chain give up some of their potential energy. Therefore, the best choice is B.

Which of the Following Most Accurately Describes What Is Happening