Biochemistry
Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 18, Problem 16P

Energetics of the Hexokinase Reaction The standard-state free energy change. Δ G º ' for the hexokinase reaction, is — 1 6.7 kJ/mol. Use the values in Table I to calculate the value of Δ G for this reaction in the erythrocyte at 37°C.

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Standard redox potentials Eo' for some common compounds in biochemistry: Eo' (Volt) + 0,81 +0,42 + 0,25 12 O₂ + 2 H+ + 2 e NO3 + 2 H+ + 2 e 2 cyt c (ox) + 2 e 2 cyt b (ox) + 2 e Pyruvate + 2 H+ + 2 e* NAD + 2 H+ + 2 e Acétoacétate + 2 H+ + 2 e (2) acétoacétate + NADH + H+ H₂O NO₂ + H₂O 2 cyt c (red) 2 cyt b (red) Lactate (3) 2 cyt c (ox) + 2 cyt b (red) NADH + H+ B-hydroxybutyrate + 0,08 - 0,19 With the help of the above table, determine the spontaneous direction of the following reactions in the standard conditions. Justify your answers by calculating the Gibbs (free) energy of reaction in each case. (1) pyruvate + ß-hydroxybutyrate -0,32 - 0,35 lactate + acétoacétate B-hydroxybutyrate + NAD+ 2 cyt c (red) + 2 cyt b (ox)
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