The Diagram Represents a "Substrate Cycle" in Glucose Metabolism

The diagram represents a "substrate cycle" in glucose metabolism.Which of the following statements about the cycle is true?

A) Reactions I & II are catalyzed by the same enzyme and help establish equilibrium between the two metabolites.
B) Reaction II produces ATP by substrate-level phosphorylation.
C) Reaction II is catalyzed by an allosteric enzyme that is inhibited by fructose-2-6-bisphosphate.
D) Reaction I is involved in the biosynthesis of glucose.
E) Reaction II occurs under low-energy conditions when the cell needs ATP.

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