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

1	The drug AZT
	A)	inhibits the enzyme reverse transcriptase.
	B)	inhibits the production of HIV proteins.
	C)	inhibits the enzyme protease.
	D)	breaks down human cell receptors so that HIV cannot bind to them.
	E)	binds to human cell receptors thereby blocking HIV’s access to them.
2	Chemokines appear to inhibit HIV infection by
	A)	blocking replication of the virus.
	B)	interfering with the synthesis of viral proteins.
	C)	interfering with the cleavage of viral polyproteins.
	D)	disabling the CD4 receptor.
	E)	blocking the CXCR4 and CCR5 coreceptors.
3	An antiviral factor called ________ has been found in ________ cells.
	A)	CAF ; CD4
	B)	CAF ; CD8
	C)	NEF ; CD4
	D)	NEF ; CD8
	E)	NEF ; brain
4	Mutations that inactivate the CCR5 receptor make an individual more susceptible to AIDS.
	A)	True
	B)	False
5	It is hard to create a vaccine against HIV infection because the virus has a high mutation rate.
	A)	True
	B)	False