Xylem transports water and dissolved nutrient minerals in which direction?
a. upward
b. downward
c. inward laterally
d. outward laterally
e. both upward and downward
a
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Which hormone triggers gallbladder contractions?
a. secretin b. gastrin c. insulin d. cholecystokinin e. enterogastrone
Each of the following is correct about cholera and its effect on G-protein–adenylyl cyclase activity except
A) Vibrio cholera bacteria colonize the gut. B) Cholera toxin is secreted by Vibrio cholera bacteria. C) Intestinal cells infected with cholera toxin import abnormally high levels of salts and fluids into the bloodstream. D) Cholera toxin alters Gs? so that it no longer hydrolyzes GTP. E) Intestinal cells infected with cholera toxin maintain abnormally high cAMP levels.
By what process do body cells become specialized?
a) regeneration b) reproduction c) differentiation d) development
Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year
The factors that keep natural populations from increasing are collectively called A) scramble competition. B) nonliving factors. C) exponential growth. D) biotic potential. E) environmental resistance.