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The free energy change of each step of glycolysis is given in the table below. ∆G°’ is the free energy under standard conditions (25°C, 1M each reactant, pH 7), while ∆G is the free energy change at presumed physiological conditions. Why must no step have a positive ∆G under physiological conditions?

The free energy change of each step of glycolysis is given in the table below. ∆G°’ is the free energy under standard conditions (25°C, 1M each reactant, pH 7), while ∆G is the free energy change at presumed physiological conditions. Why must no step have a positive ∆G under physiological conditions?

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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The free energy change of each step of glycolysis is given in the table below. ∆G°’ is the free energy under standard conditions (25°C, 1M each reactant, pH 7), while ∆G is the free energy change at presumed physiological conditions. Why must no step have a positive ∆G under physiological conditions?

AG (kJ/mol) - 27.2 - 1.4 - 25.9 Step Enzyme 1 HK AG" (kJ/mol) - 20.9 2 PGI 2.2 3 PFK - 17.2 4 aldolase 22.8 - 5.9 - 0.0 5 TIM 6 + 7 GAPDH + PGK 7.9 - 16.7 -1.1 - 0.6 - 2.4 - 13.9 8 PGM 4.7 - 3.2 - 23.0 9 enolase 10 PK
Transcribed Image Text:AG (kJ/mol) - 27.2 - 1.4 - 25.9 Step Enzyme 1 HK AG" (kJ/mol) - 20.9 2 PGI 2.2 3 PFK - 17.2 4 aldolase 22.8 - 5.9 - 0.0 5 TIM 6 + 7 GAPDH + PGK 7.9 - 16.7 -1.1 - 0.6 - 2.4 - 13.9 8 PGM 4.7 - 3.2 - 23.0 9 enolase 10 PK
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