The rate of diffusion of molecules would be fastest in a cell with an
A. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures.
B. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures.
C. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures.
D. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures.
C
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Respiration is a physiological process by which O2
enters the internal environment and CO2 leaves by diffusing across a __________. Fill in the blank(s) with the appropriate word(s).
From an ecological perspective, the dispersal of fruit flies (Drosophila) on the Hawaiian islands, which has resulted in speciation, is BEST termed ________
A) vicariance B) reinforcement C) hybridization D) adaptive radiation
Signaling by cadherins is an example of _______ signaling.
a. autocrine b. endocrine c. paracrine d. direct cell-to-cell
Endospores survive a variety of harsh conditions in part because of the presence of
A) mycolic acid. B) lipopolysaccharide. C) hopanoids. D) dipicolinic acid. E) glycoproteins.