Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
a. declines in polar bears result in diminished prey populations
b. the arrival of sailors on Mauritius island led to the extinction of dodo birds
c. declines in eagle populations due to the accumulation of pollutants in their eggs
d. decline in buffalo caused a drop in native buffalo clover
e. pollution led to declines in the Texas blink salamander population
ANSWER: d
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In bubonic plague, buboes are swellings formed in the lymph nodes and filled with
A) Yersinia pestis. B) Rickettsia prowazekii. C) Xenopsylla cheopis. D) Clostridium tetani.
Approximately how long after fertilization does the egg implant in the uterine wall?
A. 5 days B. 1 day C. 3 days D. 7 days E. 10 days
What conclusions did Beadle and Tatum reach with their studies of Neurospora?
a. Each mutant gene affected three enzymes. b. Each mutant gene affected a pair of enzymes. c. Each mutant gene affected only one enzyme. d. Mutant genes had no effect on the enzymes produced by the cells. e. Each mutant gene affected as many enzymes as were present in a particular metabolic pathway
All of the following are correct about the autoclave, except
A) Sterilization is achieved when steam condenses against the objects in the chamber and raises their temperatures. B) It is the temperature that kills the microbes, not the pressure by itself. C) It is important not to overload the chamber. D) It is effective for sterilizing powders, oils, and waxy substances. E) The duration of the process depends on how full the chamber is.