What is the diploid number of chromosomes in the cells in this activity?
a. 1
b. 2
c. 4
d. The plant and animal cells have different diploid numbers.
b
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The coagulation system serves to:
a. increase blood flow to the area of infec-tion and can also effectively wall off the infection through the production of barrier substances. b. attract and enhance the activities of pha-gocytes. c. provide substances secreted by one type of cell, which have substantial effects on the antiinfective activities of other cells. d. ingest and destroy microorganisms.
The punctuated equilibrium hypothesis suggests that speciation usually occurs in isolated populations at the edge of a
species’ geographical distribution.
a. True b. False
The primary immune response is characterized by:
A. induction by one dose of antigen B. a long lag period C. Low levels of antibody produced D. waning rapidly E. all of the above
During the 1960s, a group of scientists in the northeastern United States conducted an experiment at Hubbard Brook, New Hampshire. A 38-acre watershed was completely deforested and the runoff (water flow) monitored for several years. It was compared to an adjacent watershed that was left untouched. The scientists collected data during those years and found
A. an insignificant difference in the amount of nitrogen from the two areas. B. a tremendous increase in the total amount of runoff from Hubbard Brook although the loss of nitrogen was fairly consistent in both areas. C. no difference in the amount of runoff from the two areas. D. a tremendous increase in the amount of runoff and nitrogen release from Hubbard Brook compared to the control.