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Why might an HIV test be negative within the first two to three weeks of an HIV infection?


A) because there is no HIV in the blood
B) because there are no detectable levels of HIV antibodies in the blood
C) because there are no symptoms
D) because the CD4 T-cell count is above 500 cells/mm3
E) because there are no opportunistic infections yet

F) A) and B)
G) D) and E)

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Prokaryotic cells do not possess DNA.

A) True
B) False

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Legionnaires disease emerged in 1976 due to


A) exposure to wild monkeys.
B) the consumption of horseshoe bats.
C) a mutation of the influenza virus.
D) contamination of an air-conditioning system.
E) the abuse of antibiotics.

F) B) and D)
G) A) and B)

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The HIV virus contains a genome composed of


A) double-stranded DNA.
B) single-stranded DNA.
C) double-stranded RNA.
D) single-stranded RNA.
E) one strand of DNA and one strand of RNA.

F) C) and E)
G) None of the above

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People can become resistant to antibiotics.

A) True
B) False

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