24. Which enzyme catalyzes the primary regulation site of glycolysis? (A) hexokinase (B) phosphofructokinase-1 (C) glyceraldehyde-3-phosphate dehydrogenase (D) phosphoglycerate kinase (E) pyruvate kinase

3. When glucagon binds to its receptor on a liver cell, which of the following sequence of events occurs 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

24. Which enzyme catalyzes the primary regulation site of glycolysis?
(A) hexokinase
(B) phosphofructokinase-1
(C) glyceraldehyde-3-phosphate dehydrogenase
(D) phosphoglycerate kinase
(E) pyruvate kinase

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