Question

Which of the following statement is correct in relation to the ETS?

• A. It is present in the mitochondrial matrix.
• B. Oxidation of one molecule of NADH gives rise to 2 molecules of ATP, while that of one molecule of $FAD{H}_2$ produces 3 molecules of ATP.
• C. Oxygen acts as the final hydrogen acceptor.
• D. In respiration, light energy is utilized for the production of proton gradient.

Answer 1

Answer: (C)

ETS (Electron transport system or chain) is a series of coenzymes that takes part in the passage of electrons from a chemical to its ultimate acceptor. ETS is present in the inner mitochondrial membrane, oxidation of one molecule of NADH gives rise to 3 molecules of ATP, while that of one molecule of $FAD{H}_2$ produces 2 molecules of ATP. In respiration, energy of oxidation-reduction is utilized for the production of proton gradient.