For the hydrolysis of ATP at 25°C∆ (298 K) and pH 7, ATP + H2O → ADP + Pi + H+, the standard free energy of hydrolysis (∆G°') is 230.5 kJ mol-1 (27.3 kcal mol-1), and the standard enthalpy change (∆H°') is 220.1 kJ mol-1 (24.8 kcal mol-1). Calculate the standard entropy change (∆S°') for the reaction, in both joules and calories. Why is the positive sign of the answer to be expected in view of the nature of the reaction?
Answer to relevant QuestionsAll the organophosphate compounds listed in Table 15.1 undergo hydrolysis reactions in the same way as ATP. The following equation illustrates the situation for glucose-1-phosphate. Glucose-1-phosphate + H2O → Glucose + ...Does all the energy released by an exergonic reaction go into driving a coupled endergonic reaction? Give an example to support your answer. Can the thermodynamic property DG° be used to predict the speed of a reaction in a living organism? Why or why not? Draw Haworth projection formulas for dimers of glucose with the following types of glycosidic linkages: (a) A β(1 → 4) linkage (both molecules of glucose in the β form) (b) An a,a(1 → 1) linkage (c) A β(1 → 6) ...Which reaction or reactions that we have met in this chapter require ATP? Which reaction or reactions produce ATP? List the enzymes that catalyze the reactions that require and that produce ATP.
Post your question