Soils in tropical rain forests are nutrient rich
Indicate whether the statement is true or false.
ANS: F, poor
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What type of cell does Ehrlichia chaffeensis infect in humans?
A. capillary endothelial cells B. B lymphocytes C. neutrophils D. monocytes E. eosinophils
Foreign substances like nicotine, morphine, and menthol exert their initial effects by _____
(a) killing cells immediately, exerting their physiological effects by causing cell death. (b) diffusing through cell plasma membranes and binding to transcription factors to change gene expression. (c) interacting with cell-surface receptors, causing the receptors to transduce signal inappropriately in the absence of the normal stimulus. (d) removing cell-surface receptors from the plasma membrane.
Which statement best describes the concept of alternation of generations?
a. One generation of plants is skipped every other year. b. There are two phases, a sporophyte and a gametophyte. c. The parental generation alternates with a juvenile generation. d. A green sporophyte phase produces food for a nongreen gametophyte.
Why are top-level predators like lions and eagles so rare in a community?
A. Only a small amount of the energy is passed from one trophic level to the next. B. They do not breed as fast as other animals. C. Predation by higher predators reduces their numbers. D. It is difficult for them to learn how to capture prey. E. Their job is to keep the population size of other animals in check.