PFK-2 and Fructose 2,6-Bisphosphatase Are Two Names for the Same

question 29

Multiple Choice

PFK-2 and fructose 2,6-bisphosphatase are two names for the same enzyme.The name PFK-2 is used for the enzyme's catalysis of the phosphorylation of fructose 6-phosphate to fructose 2,6-bisphosphate.The name fructose 2,6-bisphosphatase is used for its catalysis of the reverse reaction.What is unique about this enzyme that makes it logical to use two names?

• A)It is one of very few enzymes that can catalyze both the forward and reverse reactions.
• B)The enzyme is a monomer when catalyzing the phosphorylation reaction and a dimer when catalyzing the reverse reaction.
• C)The forward and reverse reactions occur in different compartments within the cell,so a different name is used for each activity.
• D)The enzyme is bifunctional.The forward and reverse reactions are catalyzed by different sites on the same enzyme.

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