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

1	DNA is unwound by
	A)	DNA polymerase III
	B)	RNA primase
	C)	DNA polymerase I
	D)	helicase
	E)	DNA ligase
2	DNA polymerase can add nucleotides to
	A)	a free 3' OH end of a growing DNA chain
	B)	a free 5' OH end of a growing DNA chain
	C)	either a 3' or a 5' end of a DNA chain
	D)	a 5' end of an RNA primer
	E)	all of the above
3	The leading strand of DNA is synthesized
	A)	discontinuously in a 5' to 3' direction
	B)	continuously in a 5' to 3' direction
	C)	discontinuously in a 3' to 5' direction
	D)	continuously in a 3' to 5' direction
	E)	in both directions
4	The lagging strand of DNA is synthesized continuously.
	A)	True
	B)	False
5	DNA ligase forms a bond between the 3'OH of the growing strand and the 5' phosphate in front of it, joining the DNA fragments together.
	A)	True
	B)	False