Nerve impulses cannot reverse and travel up the axon toward the cell body due to _____
the refractory period
the resting potential
the action potential
summation
A. the refractory period
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Scientists discovered that the primary reason leaves either develop as simple or compound is related to
A. whether the KNOX gene is active or not active. B. where the leaf primordium is positioned. C. whether auxins are moving in the stem tip. D. how fast the KNOX gene arrives at the primordium. E. the protein PHANTASTICA and its interaction with auxins.
At the arteriole end of the capillary, more fluid leaves
the capillary than enters as a result of a. osmotic pressure. b. hydrostatic pressure c. gap junctions. d. vasodilation. e. all of these.
The striking dissimilarities in plant communities among different biomes that have the same average yearly amount of rainfall can be explained by the fact that
A) plant communities are influenced more by the acidity of rain than by the amount of rainfall. B) plant communities are not influenced by rainfall. C) plant communities occur randomly, depending on where seeds are blown or carried. D) plant communities evolve more slowly than changes in weather patterns. E) temperature and rainfall interact to influence plant communities.
Which type of antibody is involved in the allergic response?
a) IgM b) IgA c) IgE d) IgD.