Multiple Choice (5 pts each). 14. Which molecule is capable of activating a receptor tyrosine kinase? a. Insulin b. Vasopressin c. Epinephrine d. cAMP e. diacylglycerol 15. Receptor tyrosine kinases a. activate heterotrimeric g-proteins directly b. are comprised of seven transmembrane helices c. are autophosphorylated by its catalytic subunits d. activate the release of intracellular calcium stores 16. Odorant molecules and epinephrin both function by activating the beta-adrenergic receptor, a g-protein coupled receptor. Which of the following is common among these 7TM helical proteins that leads to signal transduction? a. an increase in the intracellular levels of IP3 b. an increase in cAMP c. activation of Protein kinase A d. activation of cation channels 17. A zymogen a. is a protein that is the inactive form of an enzyme b. a precursor to bile salts c. emulsifies dietary lipids d. a protein that digests lipids 18. Trypsin is produced in the pancreas, but is first produced in its inactive form, trypsinogen. In order to activate trypsin, the enzyme ______ must cleave trypsinogen. a. chymotrypsin b. enteropeptidase (enterokinase) c. lipase d. elastase e. carboxypeptidase 19. Cholecystokinin a. activates pancreatic zymogens b. stimulates bicarbonate secretion by the pancreas c. stimulates the secretion of digestive enzymes d. downregulates the production of bile
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