Each of the following statements concerning HIV is correct except
A. Screening tests for antibodies and nucleic acid are useful to prevent transmission of HIV through transfused blood
B. The opportunistic infections seen in AIDS are primarily the result of a loss of cell-mediated immunity
C. Zidovudine (azidothymidine) inhibits the RNA-dependent DNA polymerase
D. The presence of circulating antibodies that neutralize HIV is evidence that an individual is protected against HIV-induced disease
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Highly active antiretroviral therapy (HAART) is less than ideal because
A. It does not eliminate latent HIV infection
B. Some HIV strains are resistant to it
C. It often has severe side effects
D. All of the above
The typical course of an untreated HIV infection extends over 10 or more years. There is usually a long period (clinical latency) between the time of primary HIV infection and the development of AIDS. During this period of clinical latency
A. HIV is not detectable in the plasma
B. CD4 cell counts remain unchanged
C. Virus replicates at a very low rate
D. Virus is present in lymphoid organs
E. Neutralizing antibodies are not elicited
Retroviruses encode an enzyme called reverse transcriptase. The function of the reverse transcriptase enzyme is
A. DNase activity
B. RNA-dependent DNA polymerase activity
C. DNA-dependent RNA polymerase activity
D. RNA-dependent RNA polymerase activity
A virus that causes human cancer is also associated with a nervous system disorder called tropical spastic paraparesis. That virus is
A. Polyomavirus JC
B. Polyomavirus SV40
C. Herpes simplex virus
D. Human T-lymphotropic virus
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