AP BIOLOGY

Detailed explanation-1: -Oxygen is the final electron acceptor in this respiratory cascade, and its reduction to water is used as a vehicle by which to clear the mitochondrial chain of low-energy, spent electrons. The enzyme that catalyzes this process, cytochrome oxidase, spans the mitochondrial membrane.

Detailed explanation-2: -Oxygen acts as the final electron acceptor in the electron transfer chain, resulting in the formation of H2O. This is essential because without it, the electron transfer chain cannot function resulting in a lack of oxidative phosphorylation in the inner membrane of the mitochondria.

Detailed explanation-3: -Answer and Explanation: Oxygen is not the only terminal electron acceptor (TEA) for cellular respiration in prokaryotic cells. This is because some prokaryotic cells can carry out anaerobic respiration where oxygen is not used as the terminal electron acceptor.

Detailed explanation-4: -The final electron acceptor is oxygen (O2), it has a high electronegativity and accepts low-energy electrons. Hydrogen is combined with oxygen, forming water as the final product.