Evaporation from the leaves of a tree will pull water up through the roots as an unbroken column throughout the entire height of the tree. This feat is possible because of which characteristic of water?
A) surface tension
B) cohesion
C) absorption
D) kinetic energy
E) vaporization
B) cohesion
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When the atria are filled and the AV valves are open, blood flows directly into ________
a. the aorta b. the pulmonary circuit c. the systemic circuit d. both ventricles
Nanophytoplankton is
a. 2.0 to 20 microns. b. 20 - 200 microns. c. 2 - 20 mm. d. 20 - 200 cm. e. 20 - 200 mm.
Enzyme activity may be affected by
a. temperature. b. the presence of chemicals that fit into allosteric sites. c. feedback inhibition. d. metabolic conditions in the cell. e. all of these.
How might anthropogenic enhancement of the greenhouse effect result in increased primary production?
A) Warmer temperatures would lengthen the growing season and speed metabolism. B) Enhanced CO2 concentrations would increase the rate of photosynthesis. C) both of the above