18) In the citric acid cycle, acetyl-CoA reacts with ________ to produce _________.(A) fumarate; α-ketoglutarate(B) oxaloacetate; citrate(C) citrate; isocitrate(D) succinyl-CoA; oxaloacetate(E) malate; cis-aconitate

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

18) In the citric acid cycle, acetyl-CoA reacts with to produce _.
(A) fumarate; α-ketoglutarate
(B) oxaloacetate; citrate
(C) citrate; isocitrate
(D) succinyl-CoA; oxaloacetate

(E) malate; cis-aconitate

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