The Diagram Represents a "Substrate Cycle" in Glucose Metabolism

question 4

Multiple Choice

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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