Question

What is the role of FADH${}_2$ and NADH in cellular respiration?

• A. Catalyze the breakdown of glucose to three carbon sugars
• B. Carry electrons to the cytochrome membrane proteins
• C. Catalyzes the addition of a phosphate group to ADP
• D. Act as a final electron acceptor 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

Several different molecules carry high-energy electrons to the electron transport chain to generate ATP molecules. 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 composed of protein complexes, releasing the electrons that they once had. The end result is loads of energy in the form of ATP.

Thus, the correct answer is option 'Carry electrons to the cytochrome membrane proteins'.