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.

7. DNA double helix structure is stabilized by all of the following EХСЕРТ:(A) the sugar-phosphate backbones are oriented in opposite directions.(B) the glycosidic bonds holding paired bases are directly across the helix from one another.(C) cations such as Mg2+ bind to the anionic phosphates.(D) bases stack together through hydrophobic interactions and van der Waals forces.(E) appropriate base pairing builds a polymer whose external dimensions are uniform.

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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