29) In C4 plants, CO2 in the mesophyll cell reacts with _________ to form oxaloacetate while in the bundle sheath cell, _________ undergoes decarboxylation to pyruvate. (A) pyruvate; aspartate (B) phosphoenolpyruvate; oxaloacetate (C) pyruvate; malate (D) phosphoenolpyruvate; malate (E) 3-phosphoglycerate; oxaloacetate

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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