In the classic study by Harris et al. (1933), when thiamine-deficient rats were offered 10 new diets, only one of which contained the badly needed thiamine...
(a) all of them developed an immediate preference for the thiamine-rich diet
(b) almost all of them learned to eat the thiamine-rich diet and avoid the deficient diets
(c) they were equally likely to eat each of the 10 new diets
(d) few developed a preference for the thiamine-rich diet
(d) few developed a preference for the thiamine-rich diet
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In arid terrestrial environments, salt can accumulate in the soil because of
A. the selective uptake of water by plants. B. the activities of grazing animals. C. the precipitation of salt from dry air. D. the secretion of salt by plants. E. the settlement and evaporation of water.
Which of the following structures are external to both Bacterial and Archaeal cells?
A. Hami B. Pili C. Peptidoglycan D. Ribosomes
Phenotypic similarities that provide no information about shared ancestry are ____
a. homologies b. homoplasies c. morphological d. anatomical e. physiological
An amine hormone important in the stress response in vertebrates is
A. melatonin. B. serotonin. C. epinephrine. D. dopamine. E. cortisol.