Question

multiple choice question
at the end of the electron transport chain, each oxygen atom accepts what from cytochrome a3?
2 protons
2 hydrogen atoms
2 electrons

Explanation:

In the electron - transport chain, at the end, oxygen acts as the final electron acceptor. Cytochrome a3 donates electrons to oxygen. Each oxygen atom accepts 2 electrons to form an oxide ion which then combines with protons to form water.

Answer:

O 2 electrons