What happens first following a neuron
stimulation?
a. Sodium ions enter the cell.
b. Sodium ions leave the cell.
c. Potassium ions enter the cell.
d. Potassium ions leave the cell.
e. Potassium ions are involved in positive
feedback.
A
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Under what circumstances would a molecular geneticist need to use a bacterial artificial chromosome (BAC)?
A. When cloning small, prokaryotic genomes. B. When cloning small, eukaryotic genomes. C. When cloning large, eukaryotic genomes. D. When the DNA inserts to be used for cloning are very small. E. When sequencing small proteins.
The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays
a central role in providing habitat for a variety of other species, and if these cacti die or are removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a __________.
a. keystone species b. tertiary consumer c. generalist d. trophic level
(n) ____________________ stem cell gives rise to other specialized cell types. Fill in the blank(s) with the appropriate word(s)
Where does the kangaroo rat get the bulk of its water from?
a. from re-uptake of water from urine b. from oxidative reactions in its cells c. from absorption through its skin d. from ingestion of food