Given the structure of the anti-HIV drug azidothymidine (AZT), how do you think it blocks viral replication?
a. It blocks RNA synthesis
b. It inhibits host T cells from replicating
c. It inhibits the assembly of new viruses in the cell
d. It blocks DNA synthesis
e. It prevents HIV from entering the cell
d. It blocks DNA synthesis
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Which of the following is a typical example of mRNA editing?
A. deamination of cytidine to thymine B. insertion of one or more A residues C. deletion of one or more U residues D. guanosine deaminated to inosine
Genotype Qq produces 10 offspring per year. Genotype QQ has a fitness value of 0.4 and genotype qq has a fitness value of 0.2. How many offspring does genotype qq produce each year?
A. 4 B. 1 C. 6 D. 2 E. 8
The pattern shown in figure 9.6 best resembles
A) a survivorship curve. B) exponential growth. C) R0= 0. D) r < 0.
Which of the following is not a condition to estimate a model for causality?
A. The error terms are distributed normally. B. The sample is a random sample from the target population. C. The data generating process can be described by a determining function such as Yi = ?0 + ?1X1i + ...+ ?kXki + Ui. D. E[Ui] = E[UiX1i] = ... E[UiXki] = 0.