Apical-basal patterning genes are expressed in
A. the basal region.
B. the apical region.
C. the central region.
D. the apical, basal, and central regions.
E. the apical and basal regions only.
D. the apical, basal, and central regions.
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What causes the inactivation of a G protein?
A. The alpha subunit hydrolyzes GTP to GDP and inorganic phosphate. B. The beta and gamma subunits trigger the hydrolysis of GTP to GDP. C. A phosphatase removes the inorganic phosphate group from GTP. D. The inactive receptor catalyzes the replacement of GTP by GDP.
Which of the following diseases is not caused by a spore-forming bacterium?
A) anthrax B) diphtheria C) gas gangrene D) tetanus
How many cells are produced as the result of meiosis and mitosis?
A. two, four B. four, two C. two, two D. four, four E. it varies each time the cells go through meiosis and mitosis
The loss of water from the surface of plants is
A. transpiration. B. dew. C. biomagnification. D. bioaccumulation.