13. During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is
(A) dihydroxyacetone phosphate  glycerol 3-phosphate
(B) glucose 6-phosphate  fructose 6-phosphate
(C) isocitrate  -ketoglutarate
(D) oxaloacetate  malate
(E) pyruvate  lactate

7. In glycolysis, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in vigorously contracting muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is: (A) dihydroxyacetone phosphate=＞ glycerol 3-phosphate. (B) pyruvate=＞lactate. (C) glucose 6-phosphate=＞ fructose 6-phosphate. (D) isocitrate=＞α-ketoglutarate. (E) oxaloacetate=＞malate.

69. During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is _____(A) dihydroxyacetone phosphate → glycerol 3-phosphate (B) glucose 6-phosphate → fructose 6-phosphate (C) isocitrate → a-ketoglutarate (D) oxaloacetate → malate (E) pyruvate → lactate

13. During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is:(A)dihydroxyacetone phosphate → glycerol 3-phosphate.(B)glucose 6-phosphate fructose 6-phosphate.(C)isocitrate → a-ketoglutarate.(D)oxaloacetate malate.(E) pyruvate lactate.

14. An enzyme used in both glycolysis and gluconeogenesis is (A) 3-phosphoglycerate kinase (B) glucose 6-phosphatase (C) hexokinase (D) phosphofructokinase-1 (E) pyruvate kinase

15. The oxidation of 3 mol of glucose by the pentose phosphate pathway may result in the production of (A) 2 mol of pentose, 4 mol of NADPH, and 8 mol of CO2 (B) 3 mol of pentose, 4 mol of NADPH, and 3 mol of CO2 (C) 3 mol of pentose, 6 mol of NADPH, and 3 mol of CO2 (D) 4 mol of pentose, 3 mol of NADPH, and 3 mol of CO2 (E) 4 mol of pentose, 6 mol of NADPH, and 6 mol of CO2

16 Which of the below is not required for the oxidative decarboxylation of pyruvate to form acetyl-CoA? (A) ATP (B) CoA-SH (C) FAD (D) Lipoic acid (E) NAD+

17 The reaction of the citric acid cycle that produces an ATP equivalent (in the form of GTP) by substrate level phosphorylation is the conversion of (A) citrate to isocitrate (B) fumarate to malate (C) malate to oxaloacetate (D) succinate to fumarate (E) succinyl-CoA to succinate

18 What is the correct order of function of the following enzymes of  oxidation? 1. β-Hydroxyacyl-CoA dehydrogenase 2. Thiolase 3. Enoyl-CoA hydratase 4. Acyl-CoA dehydrogenase (A) 1, 2, 3, 4 (B) 3, 1, 4, 2 (C) 4, 3, 1, 2 (D) 1, 4, 3, 2 (E) 4, 2, 3, 1

19 Which substance is not involved in the production of urea from NH4+ via the urea cycle? (A) Aspartate (B) ATP (C) Carbamoyl phosphate (D) Malate (E) Ornithine

20 Antimycin A blocks electron transfer between cytochromes b and c1. If intact mitochondria were incubated with antimycin A, excess NADH, and an adequate supply of O2, which of the following would be found in the oxidized state? (A) Coenzyme Q (B) Cytochrome a3 (C) Cytochrome b (D) Cytochrome e (E) Cytochrome f

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