Which of the following would elevate melatonin secretion?
A. increase calcium intake
B. increase darkness exposure time
C. decrease sound
D. decrease testosterone production
E. increase water intake
B. increase darkness exposure time
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Which type of receptor undergoes a conformational change upon activation? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
The term herbaceous implies that a plant
A. is only found in wet environments. B. has not developed a secondary vascular tissue. C. probably will live several years. D. has no apical meristem. E. lacks vascular tissue.
Which of the following explanations of the species-area relationship would be anticipated at the smallest, local scales?
A) The number of species increases with area because larger areas contain a greater number of individuals. B) The number of species increases with area because larger areas have more habitats. C) The number of species increases with area because larger areas support distinct evolutionary lineages.
A woman is missing one of her X chromosomes. With which of the following conditions would she be diagnosed?
A) Turner syndrome B) polyploidy C) cancer D) Klinefelter syndrome E) a chromosomal deletion