View the animation below, then complete the quiz to test your knowledge of the concept.

1	Protons received from NADH
	A)	act as coenzymes
	B)	are passed along the electron transport chain along with the electrons
	C)	are the terminal electron acceptors
	D)	are pumped outside the cell
2	Oxygen acts as
	A)	a carrier of electrons, passing electrons down the chain
	B)	a reducing agent
	C)	the terminal electron acceptor
	D)	a coenzyme
3	When protons are pumped outside the cell membrane
	A)	water is made
	B)	a proton motive force is created
	C)	NADH gets reduced
	D)	electrons are lost
4	A hydrogen atom consists of a proton and a pair of electrons.
	A)	True
	B)	False
5	The energy captured in the phosphorylation of ADP to ATP comes from the proton motive force created in respiration.
	A)	True
	B)	False