Why has it been difficult to generate drugs to treat AIDS?
A. HIV mutates rapidly among infected humans.
B. People with HIV infections die very rapidly, before the drugs have a chance to cure them.
C. HIV does not cause AIDS.
D. HIV does not use any enzymes that can be targeted by drugs.
E. The only way to kill a virus is with a vaccine, not with drugs.
A. HIV mutates rapidly among infected humans.
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Which marine zone is one of the most stressful habitats on Earth?
a. the pelagic province b. the continental shelf c. deep sea trenches d. the abyssal zone e. the intertidal zone
During the G2 phase of the cell cycle, most of the cell's activity is directed toward
a. DNA replication. b. membrane synthesis. c. resting for the next step. d. sorting the chromosomes. e. making the proteins that drive mitosis.
Milk let-down, labor, and childbirth are mediated by the ____ gland
a. pineal b. anterior pituitary c. posterior pituitary d. parathyroid e. thyroid
Which of the following represents the possible genotype(s) resulting from a cross between an
individual homozygous (BB) and one heterozygous (Bb) individual? a. BB and Bb b. BB, Bb, and bb c. BB only d. Bb only e. bb only