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.

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

What characteristic makes a cell membrane selectively permeable

Which claim correctly describes how genes can produce a phenotype? one gene is responsible for all traits. each trait is determined by a single gene. one gene can be responsible for many traits. each gene is responsible for exactly one trait.