Question

why are nadh and fadh₂ necessities in the electron transport chain? (1 point)
they move down the electron transport chain.
they remove electrons from the electron transport chain.
they move electrons to the electron transport chain.
they accept electrons in order to power the electron transport chain.

Explanation:

To solve this, we analyze the role of NADH and FADH₂ in the electron transport chain (ETC):

• Option 1: Electrons (not NADH/FADH₂) move down the ETC. Eliminate.
• Option 2: NADH/FADH₂ donate (not remove) electrons to the ETC. Eliminate.
• Option 3: NADH and FADH₂ are electron carriers that transfer (move) electrons from earlier stages (like glycolysis/Krebs cycle) to the ETC. This matches their function.
• Option 4: NADH/FADH₂ donate (not accept) electrons to power the ETC. Eliminate.

Answer:

C. They move electrons to the electron transport chain.