For the process of diffusion to occur, molecules must
A. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached.
B. move from areas of low concentration to areas of higher concentration until an equilibrium is reached.
C. remain stationary until their molecular motion allows for an equilibrium to be reached.
D. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium.
E. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport.
A. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached.
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As body size increases in animals, _____
A) the surface-area-to-volume ratio decreases B) reproduction becomes limited to terrestrial environments C) there is greater variability in metabolic rate D) migration to tropical areas becomes necessary for thermoregulation E) it becomes more difficult to conserve body warmth in cold environments
Which are accurate statements about digestion? (Check all that apply.)
_____ Most ingested food particles are digested in the stomach. _____ The muscles in the walls of the pharynx and esophagus contribute to swallowing. _____ Carbohydrates and lipids are digested first, in order to supply the organism with the most immediate energy. _____ The gizzard contains sand or tiny stones swallowed by the bird.
The enzyme rubisco is important to the process of
a. catabolism. c. glycolysis. b. fermentation. d. carbon fixation.
If a mammal suffered damage to the temperature sensor in its brain, what would be the result?
A. The animal would fall back onto a more primitive ectothermic mode of regulation. B. Only the integumentary system is required to sense temperature changes. Body temperature would remain stable. C. The animal would have to rely on shivering instead of vasoconstriction to maintain body heat. D. The integrating center would not receive inputs to compare to the set point. Body temperature could rise or fall to dangerous levels.