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

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


Answer: E

Biology & Microbiology

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Why are two selectable markers present in the target vector used for making mouse gene knockouts?

What will be an ideal response?

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Each “word” in the mRNA language consists of how

many letters? a. 3 b. 4 c. 5 d. more than 5 e. all of these

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Ginkgo trees are known to lose their leaves at a certain time each year throughout the United States. Based on this information, Ginkgo trees in China must behave the same way. These statements are an example of:

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Biology & Microbiology