Question

level 4 q3 what happens as electrons flow down the electron transport chain? a. nadh and fadh₂ lose electrons b. the electrons lose energy c. an electrochemical gradient is formed d. all of the above a. nadh and fadh2 lose electrons b. the electrons lose energy c. an electrochemical gradient is formed d. all of the above

Explanation:

• Option A: NADH and FADH₂ donate electrons to the electron transport chain (they lose electrons) at the start, which is part of the process as electrons flow down.
• Option B: As electrons move through the electron transport chain (ETC), they pass from higher - energy carriers to lower - energy states, so they lose energy at each step.
• Option C: The energy released as electrons lose energy is used to pump protons across the inner mitochondrial membrane (or thylakoid membrane in photosynthesis), creating an electrochemical gradient (a gradient of protons and charge).

Since all of A, B, and C are correct descriptions of what happens as electrons flow down the electron transport chain, the answer is D.

Answer:

D. All of the Above