Archaea that have been cultured in the laboratory include
a. Crenarchaeota and Euryarchaeota.
b. Crenarchaeota and Korarchaeota.
c. Euryarchaeota and Korarchaeota.
d. Euryarchaeota and Nanorarchaeota.
e. Nanoarchaeota and Korarchaeota.
A
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The olfactory receptors discovered by Richard Axel and Linda Buck are members of a large family of similar receptor molecules termed
A. G-protein coupled receptors. B. ligand-gated ion channels. C. voltage-gated ion channels. D. intracellular receptors. E. serine/threonine proteases.
Endosperm is found in
A. angiosperms. B. gymnosperms. C. ferns. D. mosses. E. horsetails.
Which variable is least likely to contribute to the species that appear in a community during succession?
a. Number of available nesting sites b. Climate c. Altitude d. Average temperature e. Soil type
What organism is at the first trophic level in a tallgrass prairie ecosystem?
a. birds b. grasshoppers c. grasses d. decomposers e. parasites