The signal/messenger responsible for opening the gated channel in Figure 42-4 is:
a. ATP.
b. ADP.
c. cAMP.
d. K+.
e. Na+.
C
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Which of the following are arranged in the sequence in which the various taxa first appeared in time?
A. bacteria, protists, liverworts, lycophytes, streptophytes, angiosperms, gnetophytes. B. prokaryotes, protists, mosses, streptophytes, conifers, ferns, angiosperms. C. bacteria, streptophytes, protists, mosses, angiosperms, cycads. D. protists, prokaryotes, streptophytes, ferns, mosses, angiosperms, conifers. E. prokaryotes, protists, streptophytes, mosses, ferns, conifers, angiosperms.
The number of species a patch will support depends on its ____ and ____
a. size; species richness b. size; habitat c. area; species richness d. size; proximity to larger patches e. habitat; proximity to larger patches
Species interactions between members of a community include __________, which benefits both species. Fill in the blank(s) with the appropriate word(s)
During the winter of 1999, minimum temperatures did not get much below freezing in an Oregon pond, and the following summer, large mosquito populations were observed. In the winter of 2000, frost came early and most ponds were frozen for 3 months
The following summer, very small mosquito populations were observed. This is an example of A) density-dependent regulation. B) density-independent regulation. C) ecosystem carrying capacity. D) community carrying capacity. E) exotic regulation.