African sleeping sickness is transmitted by
A. ticks.
B. black flies.
C. Aedes mosquitoes.
D. tsetse flies.
D.
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A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 0 B. 5 C. 7 D. 9 E. 14
Why are chemotherapeutic agents effective against cancer cells and yet less effective at killing normal cells?
A. These agents are actually toxic to normal cells that are not actively dividing. B. These agents are toxic to cancer cells because they are actively dividing to form a tumor, whereas normal cells are not dividing or are dividing slowly. C. Many cancer drugs destroy telomeres, making the cancer cell mortal. D. These agents are toxic to cancer cells that are not actively dividing. E. None of the explanations given is true.
Scientists have confirmed by carbon dating that seeds dormant for up to 2000 years can successfully germinate. Based on the requirements for germination, what research expedition should you join in order to retrieve some ancient but viable seeds?
A. A trip to Indonesia, where the civet cat eats and expels coffee beans, producing a gourmet coffee known as Kopi Luwak. B. A trip to the Irish marsh, where wet peat creates anaerobic conditions, and your colleagues hope to unearth a bog mummy. C. A trip to the arid Dead Sea region, where your historian colleagues have found a storeroom of wax-sealed jars. D. A trip to the Burgess Shale in Canada, where your paleontologist colleagues have found fossils from the Cambrian era.
During initiation in bacterial translation, a particular mutation causes the premature binding of the large ribosome subunit to the small ribosome subunit. Which component of initiation is not working properly?
A) IF3 B) Ribosome's E site C) Shine-Dalgarno sequence on the mRNA D) IF1 E) IF2