Animals with bilateral symmetry typically undergo an evolutionary process whereby many nerve cells and sensory structures become concentrated at the front of the body. What is this process called?
a. segmentation
b. cephalization
c. coelom formation
d. pupation
e. radiation
b
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Which molecule passes through a lipid bilayer most readily?
A. carbon dioxide B. glucose C. K+ D. arginine E. RNA
During exposure to elevated glucose, a yeast cell will increase its uptake of glucose. Describe the mechanism by which the yeast sense the extracellular glucose.
A. by glucose uptake through glucose transporters B. by the increase in energy inside the cell when the glucose is metabolized C. by glucose diffusing into the nucleus and binding to transcription factors D. by glucose binding to glucose receptors E. by the increase in energy outside the cell when the glucose is metabolized
Which biome has a closed canopy?
a. tundra b. taiga c. tropical rain forest d. desert e. grassland
Histamine causes all of the following except
A. pruritis and headache. B. constriction of smooth muscle of bronchi and the intestine. C. wheal and flare reaction in skin. D. relaxation of vascular smooth muscle. E. increased sensitivity to pain.