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

1	The proofreading function of DNA polymerase reduces the error rate from about one in a million basepairs to about one in a ________ basepairs.
	A)	hundred thousand
	B)	ten thousand
	C)	thousand
	D)	ten million
	E)	hundred million
2	DNA polymerases use their ________ activity to remove a mismatched basepair.
	A)	3’ -> 5’ exonuclease
	B)	5’ -> 3’ exonuclease
	C)	RNase
	D)	protease
	E)	mismatchase
3	Proofreading by DNA polymerase involves the removal of
	A)	only the mismatched base on the old strand of DNA.
	B)	only the mismatched base on the newly-synthesized strand of DNA.
	C)	the mismatched basepair on both strands of DNA.
	D)	several bases on the newly-synthesized strand of DNA.
	E)	several bases on the old strand of DNA.
4	Improper base-pairing during DNA replication causes a pause in chain elongation.
	A)	True
	B)	False
5	Following base removal, DNA polymerase can add nucleotides in the 5’ to 3’ direction.
	A)	True
	B)	False