Question

The electron transport chain consists of protein complexes embedded in the inner mitochondrial membrane, where it generat a proton gradient by a series of oxidation-reduction, or redox, reactions. Although all of the stages of cellular respiration (glycolysis, the citric acid cycle, and the electron transport chain) are necessary for life, the electron transport chain is sometimes called the most important stage. First complete the sentence, then answer the question. The electron transport chain uses the transfer of protons between protein complexes to set up a proton gradient.

Answer 1

The electron transport chain uses the transfer of electrons between protein complexes to set up a proton gradient.

These electrons are carried by all four complexes of the electron transport chain and at the end of the chain, these electrons are used to reduce an oxygen molecule to oxygen ions.

ETC is the most important stage of cellular respiration from an energy point of view because it produces the most ATP. That's why it's the most important stage.