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