Following its initial activation, how does a G protein become inactivated?
A. It spontaneously loses activity within a few seconds.
B. The G-protein ? subunit containing a GTP eventually reassociates with the G-protein ?? dimer.
C. The G-protein ? subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein ? subunit and ?? dimer.
D. The receptor becomes internalized.
E. The G-protein ? subunit is digested and recycled.
C. The G-protein ? subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein ? subunit and ?? dimer.
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Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic. B. paraphyletic. C. a kingdom. D. polyphyletic. E. a supergroup.
Biuret is used to test for the presence of starches
a. True b. False
Genomic studies of Neanderthals, modern humans, and chimpanzees have confirmed that ____
a. humans evolved from Denisovans b. humans and Neanderthals interbred c. humans and Neanderthals are 98.8% genetically identical d. humans are direct descendants of Neanderthals e. there is a 5% difference in the coding regions of the human genome vs. the chimpanzee genome
Common signs and symptoms of a tricyclic antidepressant overdose include:
A) excessive salivation and diarrhea. B) tachypnea and severe hypertension. C) altered mental status and tachycardia. D) constricted pupils and AV heart block.