15) What is a polyribosome?(A) ribosomes that synthesize different subunits of the same protein(B) several ribosomes all attached to the same mRNA(C) ribosomes that are covalently bonded to each other in a polymer fashion(D) a ribosome that only produces proteins that will be excreted by the cell(E) none of the above

3) When glucagon binds to its receptor on a liver cell, which of the following sequence of eventsoccurs to activate protein kinase A?(A) activation of adenylate cyclase, activation of G protein, production of cAMP(B) activation of G protein, activation of adenylate cyclase, production of cAMP(C) activation of G protein, production of cAMP, activation of adenylate cyclase(D) production of cAMP, activation of adenylate cyclase, activation of G protein(E) none of the above

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