Which organisms would most likely have the highest tissue concentration of DDT?
a. zooplankton
b. small herbivorous fish
c. large predatory fish
d. osprey
e. large herbivorous fish
ANSWER: d
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Scientists estimate that about _____ of the world's eukaryotic organisms have been discovered and given scientific names.
A. 1% B. 5% C. 15% D. 40% E. 90%
Water molecules exhibit cohesive and adhesive properties. What is the chemical bond characteristic that contributes to these and other numerous important properties of water molecules?
A. The covalent bond strengths of water molecules change with pH, temperature, or solute conditions present. B. The covalent bonds that form water molecules transform to ionic bonds in presence of other molecules, temperature changes, or pH. C. Hydrogen bonds form between water molecules, not requiring gain, loss, or sharing of electrons. D. Bonds that form water are of the nonpolar covalent form. E. Ionic bonds between water molecules create increased surface tension.
Which organism is not correctly matched to its energy source?
A) Chemoheterotroph — glucose B) Photoheterotroph — light C) Chemoautotroph — NH3 D) Photoautotroph —CO2 E) Chemoautotroph — Fe2+
Ecologist James H. Brown of the University of New Mexico has addressed species composition and
richness in experiments conducted since 1977 in the Chihuahuan desert of southeastern Arizona. In one experiment, the removal of three dominant species, all kangaroo rats, from several plots resulted in an increased diversity of other rodent species. This increase was ascribed both to lowered competition for food and also to an altered habitat, because the abundance of grass species __________ after the removal of the kangaroo rats. a. increased b. decreased c. did not change d. was threatened e. shrunk