Question

multiple choice question
a pair of electrons passed along the electron transport chain combine with ____ and an oxygen atom to form water.
two hydrogen ions
two hydrogen atoms
two hydrogen molecules
need help? review these concept resources.
rate your confidence to submit your answer.
high
medium
low
reading
© 2025 mcgraw hill. all rights reserved. privacy center terms of use

Explanation:

In the electron - transport chain, during oxidative phosphorylation, a pair of electrons combine with two hydrogen ions ($H^+$) and an oxygen atom to form water. This is a key step in cellular respiration for generating ATP.

Answer:

A. two hydrogen ions