Question

FADH${}_2$ and NADH in cellular respiration help to

• A. Catalyze the breakdown of glucose to three carbon sugars.
• B. Carry electrons to the cytochrome membrane proteins.
• C. Catalyze the addition of a phosphate group to ADP.
• D. Act as final electron acceptors in the electron transport chain.
• E. Transport hydrogen ions across the inner mitochondrial membrane.

Answer 1

The correct option is B Carry electrons to the cytochrome membrane proteins.

The NADH and FADH2 molecules are affixed with electrons and are transferred to the inner membrane of the mitochondria. They travel down the electron transport chain, releasing the electrons that they once had. The end result is loads of energy, approximately 34 ATP (energy molecule).