Steve Hubbell's work at Barro Colorado Island, Panama, points to which of the following as an impediment to the colonization of gaps by tree species?
A) lack of species capable of surviving in gaps
B) competitive displacement
C) dispersal limitation
D) predation
Ans: C) dispersal limitation
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Which of the following specialized structures/inclusions would aquatic photoautotrophic bacteria likely possess?
1. Thylakoids 2. PHB Granules 3. Carboxysomes 4. Gas vacuoles 5. Chloroplasts
When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled. B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled. C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled. D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled. E. lung and then back out with exhalation—the air sacs were not involved.
Scurvy is a deficiency disease related to which of the
following vitamins? a. A b. B1 (thiamine) c. C (ascorbic acid) d. B2 (riboflavin) e. niacin
Four of the five answers listed below are characteristics of water. Select the exception
a. stabilize temperature b. common solvent c. cohesion and surface tension d. produce salts e. change shape of hydrophilic and hydrophobic substances