Hormones are used primarily for
a. signaling target cells in the vicinity of the
secreting cells.
b. stimulating transmitter release at certain
synapses.
c. integrating social behavior in a population.
d. causing a response in a part of the body
some distance from the site of secretion.
e. all of these, depending on the species
D
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An animal that is apparently aware of its circumstances and uses reasoning to achieve a goal is said to have ____
a. conditioning b. habituation c. cognition d. imprinting e. learning
Of the following, which does NOT characterize a
population in genetic equilibrium? a. large population size b. no mutation c. differential reproduction d. absence of gene flow e. random mating
Colostrum is:
a. a protein fluid produced by the mammary gland. b. the fluid secreted by the vagina in response to sexual stimulation. c. the hormone that stimulates lactation. d. the hormone that stimulates ejection of milk into the breasts. e. a fluid secreted by the uterus during menstruation
Fungal mycelia _____.
A. have a small surface area to prevent water loss B. are found almost exclusively in dry areas C. are found almost exclusively in aquatic environments D. have a large surface area composed of branching hyphae