final exam

Which of the following is not characteristic of both desert and tundra?
   A. Few or no trees.    
   B. Usually occur far from the sea.    
   C. Low precipitation.    
   D. Plants have access to water only periodically.    
   E. Short growing seasons.

#43
If global warming were to reduce rainfall from 100 cm annually to 20 cm annually in an area of taiga at 30 degrees north latitude, what kind of ecosystem would replace the taiga?
   A. Deciduous forest.    
   B. Desert.    
   C. Arctic tundra.    
   D. Savanna    
   E. Grassland.

Question 41 of 60    1.667 Points
Alonso is studying a population of rare orchids and he is concerned about factors that may limit orchid numbers. Which of the following would be most likely to operate as a density-independent limiting factor?
   A. Aphids.    
   B. Sudden cold temperature.    
   C. Grazing.    
   D. People picking orchids.    
   E. Nutrient-limited soil.
Question 40 of 60    1.667 Points
Which of the following is an example of exponential growth over a two-year period from a starting point of 100 animals?
   A. 100>110>115.    
   B. 100>150>200.    
   C. 100>105>106.    
   D. 100>110>121.    
   E. 100> 150>175.    

Question 27 of 60    1.667 Points
Jock suffered pain in his lower back because an intervertebral disk has ruptured. Likely where was the disk located?
   A. Between lumbar vertebrae.    
   B. Between sacrum and coccyx.    
   C. Between lumbar vertebrae and coccyx.    
   D. Between cervical vertebrae.    
   E. Between sacral vertebrae.

Question 15 of 60    0.0 Points
Eunice is extracting interleukin-1 from tissue cultures. Under what conditions in an animal would interleukin-1 be produced?
   A. When complement attaches to antigens    
   B. When macrophages have engulfed germs    
   C. When cytotoxic T cells attack virus-infected cells    
   D. When helper cells recruit B cells