In the studies by David Tilman of the University of Minnesota and John Downing of the University of
Iowa, reported in the journal Nature in 1994, they established and monitored 207 plots of Minnesota
grasslands for seven years. During the study period, Minnesota's worst drought in 50 years occurred
(1987-1988). The ecologists found that those plots with the greatest number of plant species lost
__________ ground cover, as measured by dry weight, and recovered faster than species-poor plots.
a. less
b. more
c. no detectable
d. only deciduous
e. detectable
A
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The Three-Domain System of classification is based on differences in which one of the following molecules?
A) mRNA B) peptidoglycan C) rRNA D) tRNA
Allergic reactions are triggered by the production of ____ antibodies instead of ____ antibodies at the first exposure to the allergen
a. IgA; IgD b. IgA; IgE c. IgE; IgM d. IgE; IgG e. IgG; IgE
____, the ends of eukaryotic chromosomes, shorten with every cell division
a. Centromeres b. Telomeres c. Kinetochores d. Primosomes e. Nucleosomes
Which is a characteristic of all annelids?
a. They have a visceral mass. b. They have a segmented body. c. They move with a muscular foot. d. They surround their body with a mantle. e. They have an open circulatory system.