How does azidothymidine (AZT) fight AIDS?
A. It targets the virus for destruction.
B. It blocks the enzyme that assembles all of the RNA proteins into new HIV viruses.
C. It blocks the virus from entering the cell.
D. It blocks the enzyme that converts viral RNA to DNA (called reverse transcriptase, or RT).
Answer: D
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Perchlorate contamination of waterways causes which of the following problems in frogs?
a. male frogs with both male and female sex organs b. excessive growth c. interference with the metabolism of iodine d. low blood calcium and slowed bone formation
Which group represents the oldest living plant lineage?
a. hornworts b. liverworts c. mosses d. ferns e. conifers
In mice, the gene for insulin-like growth factor is imprinted. During embryonic development, only the paternal allele for insulin-like growth factor is expressed. This means
A. that the paternal allele is imprinted. B. that the maternal allele is imprinted. C. that the paternal allele is mutated. D. that the paternal allele is hyper-methylated. E. that the maternal allele is expressed.
The greatest single cause of blindness in the world is
A) neonatal gonorrheal ophthalmia. B) keratoconjunctivitis. C) trachoma. D) inclusion conjunctivitis. E) pinkeye.