AZT, used in treating AIDS, is an effective inhibitor of nucleic acid synthesis because: a. It has a nitrogen group instead of a 3' OH. b. It is a 2', 3' dideoxy compound. c. It doesn't form good base pairs. d. It inhibits RNA Polymerase needed to make RNA for new HIV virus particles. e. More than one of these is correct.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above

Which is the graph of the piecewise function f(x)? f(x) = image for option 1 image for option 2 image for option 3 image for option 4