Question

In the electron transport chain, the final electron acceptor is A) an oxygen atom. B) a molecule of carbon dioxide. C) a molecule of water. D) ADP. E) ATP.

Answer 1

The final electron acceptor in the electron transport chain of aerobic respiration is a)oxygen. Anaerobic cellular respiration can occur using alternative molecules as the final electron acceptor.

Step-by-step explanation:

In aerobic respiration, the final electron acceptor is oxygen. Oxygen is the recipient of the free hydrogen at the end of the electron transport chain.

If aerobic respiration occurs, ATP will be produced using the energy of high-energy electrons carried by NADH or FADH₂.

If aerobic respiration does not occur, anaerobic cellular respiration can take place using an organic molecule or an inorganic molecule as the final electron acceptor.

Answer 2

The correct answer is A) In aerobic respiration, the final electron acceptor is an oxygen molecule. If aerobic respiration does not occur, an alternative molecule is used as the final electron acceptor. Both methods enable energy conversion in the absence of oxygen.

Step-by-step explanation:

In aerobic respiration, the final electron acceptor is an oxygen molecule, O₂. If aerobic respiration occurs, then ATP will be produced using the energy of high-energy electrons carried by NADH or FADH₂ to the electron transport chain. If aerobic respiration does not occur, NADH must be reoxidized to NAD for reuse as an electron carrier for glycolysis to continue. Some living systems use an organic molecule as the final electron acceptor, while others use an inorganic molecule. Both processes allow organisms to convert energy in the absence of oxygen.