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Animation: How the HIV Infection Cycle Works
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View the animation below, then complete the quiz to test your knowledge of the concept.






1The HIV protein that is involved in attachment of the virus to host cells is
A)reverse transcriptase.
B)gp120.
C)CD4.
D)CCR-5.
E)CXCR-4.



2The HIV enzyme that makes a double-stranded DNA copy of the viral genome is
A)DNA polymerase.
B)RNA polymerase.
C)reverse transcriptase.
D)endonuclease.
E)gyrase.



3The type of cells infected by HIV are ________ early in the course of an infection and ________ late in the infection.
A)helper T cells ; cytotoxic T cells
B)helper T cells ; macrophages
C)macrophages ; cytotoxic T cells
D)macrophages ; helper T cells
E)macrophages ; helper B cells



4Attachment of HIV to a host cell requires a receptor and co-receptor on the surface of the host cell.
A)True
B)False



5HIV leaves an infected cell by breaking down its cell membrane.
A)True
B)False







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