What are the primary aspects of the process used by a tall tree to move water to the leaves at the top of the tree?
a. positive pressure from roots and cohesion
b. cohesion and evaporation
c. capillary action and pumps
d. capillary action and positive pressure from roots
Answer: b. cohesion and evaporation
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Degradation of organic matter is influenced by ________.
A. nutrient availability B. the nature of the microbial community present C. abiotic conditions D. All of the choices are correct.
Researchers tend to name genes based on what happens in their absence. The tinman gene in Drosophila results in
flies a. without hearts. b. with nonjointed legs. c. with a thick exoskeleton. d. with rust colored eyes. e. without brains.
Which event during the evolution of land plants probably made the synthesis of secondary compounds most beneficial?
A) the greenhouse effect present throughout the Devonian period B) the reverse-greenhouse effect during the Carboniferous period C) the association of the roots of land plants with fungi D) the rise of herbivory E) the rise of wind pollination
When the DNA of a bacterial phage is integrated into a host bacterial cell, that is called _________.
a) lysogenic b) a prophage c) attenuated d) competent