G protein-linked receptors are transmembrane proteins that convert a(n) extracellular hormone signal into an
intracellular signal that affects certain cell processes. Indicate whether the statement is true or false.
True
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Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. When researchers designed this experiment, they wrote "chemical X is toxic to fish" in their lab notebook. This statement is a(n) ____.
a. interpretation b. prediction c. hypothesis d. result e. theory
What is the purpose of gel electrophoresis?
What will be an ideal response?
The relationship between the fungi and algae in lichens is best described as
A. a possible controlled parasitism wherein the fungi withdraw food from the algae and the algae do not benefit from the association. B. a possible controlled parasitism wherein the algae are moistened and protected by the fungi, but the fungi do not benefit from the association. C. a simple cooperative mutualism between normally free-living strains. D. an endosymbiotic transfer of the chloroplasts of algae to the hyphae cells. E. a complete mixing of the genomes of the two groups at the cellular level.
Which pressure is constant during the respiratory cycle?
A) atmospheric pressure B) transpulmonary pressure C) rebound pressure (elastic recoil) D) intra-alveolar pressure E) intrapleural pressure