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

1	Cells obtain energy by ________ food molecules such as glucose.
	A)	reducing
	B)	oxidizing
	C)	redoxing
	D)	anabolizing
	E)	phosphorylating
2	Which of the following best describes the reduction of the coenzyme NAD?
	A)	NAD + H -> NADH
	B)	NAD+ + H -> NADH
	C)	NAD+ + H -> NADH2
	D)	NADH -> NAD+ + H
	E)	NADH -> NAD + H
3	A hydrogen atom consists of
	A)	protons only.
	B)	electrons only.
	C)	a proton and an electron.
	D)	a proton and several electrons.
	E)	a variable number of protons and electrons.
4	Whenever a molecule is oxidized, another molecule must be reduced.
	A)	True
	B)	False
5	NADH serves as an electron carrier that can donate its hydrogen to other molecules.
	A)	True
	B)	False