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

1		Enzymes are
			A)	lipids.
			B)	proteins.
			C)	carbohydrates.
			D)	nucleic acids.
			E)	steroids.
2		Which of the following binds to the active site of an enzyme?
			A)	water
			B)	product
			C)	substrate
			D)	any other enzyme
			E)	none of the above
3		Which of the following correctly represents the mechanism of enzyme function?
			A)	S + P -> E-P -> E + P
			B)	E + P -> E-P -> E-S -> E + S
			C)	E + P -> E-S -> E-P -> E + P
			D)	E + S -> E-S -> E-P -> E + P
			E)	E + S -> E-P -> E-S -> E + S
4		An enzyme can only bind one reactant at a time.
			A)	True
			B)	False
5		An enzyme speeds up a chemical reaction in the cell, but can only be used once.
			A)	True
			B)	False