What features characterize the dialyzer used in hemodialysis? Check all that apply.
_____ Diffusion is minimized.
_____ Surface area is substantial.
_____ Countercurrent exchange is utilized.
_____ The function is similar to the capillaries of the body.
_____ Diffusion is minimized.
__X__ Surface area is substantial.
__X__ Countercurrent exchange is utilized.
__X__ The function is similar to the capillaries of the body.
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Which of the following statements about complex multicellular organisms is false?
A. Complex multicellular organisms and simpler multicellular organisms perform a similar range of ecological functions. B. Regulatory genes guide the development of complex multicellular organisms. C. Large differences in the body forms of complex organisms result from different patterns of gene expression. D. When compared to their simpler phylogenetic relatives, complex multicellular organisms show greater species diversity. E. None of these statements about complex multicellular organisms are false.
Calculate ENa for a neuron that has an extracellular concentration of Na+ of 78 mM and an intracellular concentration
of Na+ of 6 mM.
a. -68.0 mV b. -1.14 mV c. 1.14 mV d. 31.6 mV e. 68.0 mV
When populations share a single habitat but are isolated by genetic or postzygotic mechanisms that prevent gene flow, what process can cause populations to diverge?
A) random mating B) allopatric speciation C) sympatric speciation D) random mutation E) gene duplication
Microvilli are present to increase the area available for absorption in the
A. stomach. B. gallbladder. C. small intestine. D. large intestine.