21) Which of the following does not specifically cause a membrane to be more rigid or fluid, but rather causes the Tm to occur over a greater range? (A) increasing the content of unsaturated fatty acids (B) raising the temperature (C) increasing the cholesterol content (D) decreasing the phosphatidylcholine content while increasing the phosphatidylethanolamine content (E) all 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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