Which is the best choice for the box labeled "Answer" in the illustration below?

Question

Quizplus · Accepted Answer

The box labeled "Answer" is located after the electron transport chain, where the final electron acceptor is oxygen. As a result, oxygen is reduced to water. The reduced carriers, such as NADH and FADH2, have given their electrons to the electron transport chain to generate a proton gradient for ATP synthesis. Therefore, the best choice for the box labeled "Answer" is a reduced carrier, such as BH2.

Which Is the Best Choice for the Box Labeled "Answer