Viruses are not classified in any of Whittaker's five kingdoms.
Answer the following statement true (T) or false (F)
True
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Why does the pyramidal cell, above, illustrate the concept of information integration in the nervous system?
A. It has many dendrites and a single axon. B. It has a cell membrane. C. It is an excitable cell. D. It has a nucleus, in which transcription and translation occur. E. It has many dendrites and a single axon; it has a cell membrane; it is an excitable cell; and it has a nucleus, in which transcription and translation occur. F. All of these are parameters of the pyramidal cell that illustrate the concept of information integration.
A small amount of fluid is contained in the pleural cavity to
A) promote the exchange of nutrients with both lungs. B) allow gas exchange between the lungs and the blood stream. C) allow white blood cells and macrophages access to foreign antigens entering the body through air. D) function as a lubricant as the lungs move during ventilation. E) serve as a shock absorber for the lungs during body movement.
The relationship between the fungi and algae in lichens is best described as
A. a possible controlled parasitism wherein the fungi withdraw food from the algae and the algae do not benefit from the association. B. a possible controlled parasitism wherein the algae are moistened and protected by the fungi, but the fungi do not benefit from the association. C. a simple cooperative mutualism between normally free-living strains. D. an endosymbiotic transfer of the chloroplasts of algae to the hyphae cells. E. a complete mixing of the genomes of the two groups at the cellular level.
In plants, cytokinins stimulate
a. cell division. b. cell elongation. c. cell enlargement. d. fruit ripening.