________ induces dormancy in seeds and buds and causes stomata to close
A) Abscisic acid B) Gibberellin C) Ethylene D) Cytokinin E) Auxin
A
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In a typical feedback loop, an integrator involves the ________ system and an effector involves the ________ systems
a. receptor / nervous b. glandular / receptor c. nervous / muscular or glandular d. stimulus / response
The pair of traits that best illustrates convergent evolution is
A. an elephant's tusks and a beaver's teeth. B. a lizard's arm and a bird's wing. C. a cartilage skeleton in a shark and a bone skeleton in a dolphin. D. a dragonfly's wing and a butterfly's wing.
Lampreys differ from fishes in that lampreys
A) lack a backbone. B) lack an endoskeleton. C) lack jaws. D) possess a backbone and skull.
The ID50 is
A) a measure of pathogenicity. B) the dose that will cause an infection in 50 percent of the test population. C) the dose that will kill some of the test population. D) the dose that will cause an infection in some of the test population. E) the dose that will kill 50 percent of the test population.