True or False: There are safe and effective HIV-2 vaccines available, but because HIV-1 has such high genetic variability, the vaccines are of little use to prevent AIDS
a. TRUE
b. FALSE
Answer: B
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Which stage of the cell cycle covers most of the life span of a cell?
a. interphase b. mitosis c. meiosis d. cytokinesis
When under attack, ciliates can eject dart-like protein threads from surface organelles called ____
a. vacuoles b. gullets c. trichocysts d. phagosomes e. alveoli
Which groups of archaea are adapted to living in highly salty environments? a. Extreme thermophiles b. All of these choices
c. Methanogens d. None of these choices. e. Extreme halophiles
How is enzyme activity regulated by feedback inhibition?
a. The end product of the metabolic pathway inactivates the first enzyme in the pathway. b. The end product of the metabolic pathway inactivates the last enzyme in the pathway. c. The end product of the metabolic pathway induces the first enzyme in the pathway. d. The end product of the metabolic pathway degrades the first enzyme in the pathway. e. The end product of the metabolic pathway degrades the last enzyme in the pathway.