The respiration rate of homeotherms is proportional to
A) air pressure.
B) body temperature.
C) body size.
D) environmental temperature.
C
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Signal amplification relies on:
A. increasing amounts of ligand as signal transduction proceeds. B. a sequential increase in the different components of the signal transduction pathway. C. increasing numbers of cell-surface receptors as the signal is transduced. D. increased activity of protein phosphatases.
Why does it take 10 times more energy to grow a kilogram of beef than a kilogram of wheat?
A) Only 10% of wheat is digestible by cattle. B) Cattle eat only 10% of their body weight. C) Cattle only integrate 10% of their food into biomass. D) A kilogram of wheat weighs less than a kilogram of beef
In mutualism ________.
A. the partners will not survive separately in many cases B. the mutualist is dependent on the host C. a reciprocal benefit accrues to both partners D. All of the choices are correct.
A laboratory experiment followed the growth of a flour beetle (Tribolium sp.) population over time. At first, the population increased dramatically, but later the growth slowed and the population size leveled off
Although food (the wheat flour in which they live) was still abundant, the flour beetles resorted to eating their own eggs when population densities got high. What can we conclude about cannibalism in this species? A) It is a density-dependent means of population control. B) It has no effect on the growth of the population, as food scarcity is clearly the limiting factor. C) It is a density-independent means of population control. D) We cannot reach any conclusions based on the information provided. E) It is clearly maladaptive, as populations always do best when their densities increase as much as possible.