15. The only reaction ofthe citric acid cycle (or TCA cycle) that provides substrate-level phosphorylation is catalyzed by:(A) aconitase.(B) isocitrate dehydrogenase.(C) succinyl-CoA synthetase.(D) fumarase.(E) nucleotide triphosphate kinase.

23. Which of the following represents the correct sequence of events in a cycle of ẞ-oxidation beginning with a saturated fattyacyl-CoA?(A) Hydration, FAD-coupled oxidation, -coupled oxidation, thiolytic cleavage(B) FAD-coupled oxidation, hydration, -coupled oxidation, thiolytic cleavage(C) FAD-coupled oxidation, -coupled oxidation, hydration, thiolytic cleavage(D) NAD+-coupled oxidation, FAD-coupled oxidation, hydration, thiolytic cleavage(E) NAD+-coupled oxidation, hydration, FAD-coupled oxidation, thiolytic cleavage

15. The only reaction ofthe citric acid cycle (or TCA cycle) that provides substrate-level phosphorylation is catalyzed by:

(A) aconitase.

(B) isocitrate dehydrogenase.

(C) succinyl-CoA synthetase.

(D) fumarase.

(E) nucleotide triphosphate kinase.

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