When the rodenticide warfarin was first introduced, rats were very susceptible to it. The development of resistance to warfarin by rats was the result of
A. the development of other blood clotting factors.
B. natural selection of individuals that had a beneficial mutation.
C. the high biotic potential of rodents.
D. inheritance of acquired characteristics.
E. mutation induced by warfarin.
Answer: B
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In E. coli the heat shock response, which alters the proteins produced by the cell at different temperatures, is mediated by
A) degradation of chaperone proteins at high temperatures. B) denaturing of DNA in the promoters in the genes of heat-sensitive proteins. C) synthesis of alternative sigma factors at high temperatures to activate transcription of heat-shock genes. D) increasing the promoter affinity of already existing polymerase sigma factors at high temperatures.
A(n) ______ infection is characterized by rapid onset and short duration
Fill in the blank(s) with the appropriate word(s).
In trees, such as the horse chestnut, the abscission of leaves and fruits in the fall is mediated by ____.
A. abscisic acid B. auxin C. ethylene D. cytokinin E. gibberellin
What do we call the sum total of all the chemical reactions that take place in your body?
A. Catabolism B. Embolism C. Anabolism D. Metabolism