PEP and 2-PG have similar amounts of potential metabolic energy with respect to decomposition to Pᵢ,CO₂,and H₂O.Which of the following statements applies to enolase-catalyzed decomposition of PEP and 2-PG?

Question

Quizplus · Accepted Answer

The enolase-catalyzed reaction rearranges 2-PG into a form with a high-energy phosphate bond that can be released by hydrolysis. This form is called phosphoenolpyruvate (PEP), which has a high-energy phosphate bond and can release a lot of potential energy upon hydrolysis. Therefore, the enolase reaction rearranges 2-PG to a form from which more potential energy can be released by hydrolysis. Choice A is incorrect because the enolase reaction does not create a more unstable intermediate. Choice C is incorrect because the enolase reaction does not affect the binding potential of 2-PG to the enzyme. Choice D is incorrect because the enolase reaction does not change the ∆G of the reaction to increase potential energy.

PEP and 2-PG Have Similar Amounts of Potential Metabolic Energy