What is the final electron acceptor in the electron transport chain?

Study for the DAT Quantitative Reasoning Test with multiple choice questions and detailed explanations. Hone your skills and get ready for your exam!

In the electron transport chain, the final electron acceptor is oxygen. This process takes place in the mitochondria during cellular respiration, where electrons are transferred through a series of protein complexes and coenzymes. As electrons move through the chain, they release energy that is harnessed to pump protons across the mitochondrial membrane, creating a proton gradient essential for ATP synthesis.

Oxygen's role as the final electron acceptor is critical because it combines with the electrons and protons to form water, a harmless byproduct. Without oxygen, the chain would back up, halting ATP production and leading to cellular energy depletion. The other options mentioned, such as NADH and FADH2, are electron carriers that donate electrons to the chain but do not act as final acceptors. Carbon dioxide, while a product of cellular respiration, does not participate in the electron transport process in this context. Therefore, oxygen is indispensable as the ultimate acceptor, ensuring the continued flow of electrons and the generation of ATP through oxidative phosphorylation.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy