25. Consider the section of the TCA cycle in which isocitrate is converted to fumarate. This segment of the TCA cycle can be best described by which one of the following statements? (A) These reactions yield 5 moles of high energy phosphate bonds per mole of isocitrate. (B) These reactions require a coenzyme synthesized in the human from niacin (nicotinamide) (C) These reactions are catalyzed by enzymes located solely in the mitochondrial membrane. (D) These reactions require GTP to drive one of the reactions.