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14 September, 12:13

Which of these equations demonstrates energetic coupling in a cell? equation 1: atp + h2o → adp + pi δg1 = - 7 kcal/mol equation 2: phosphoenolpyruvate + h2o → pyruvate + pi δg2 = - 14.8 kcal/mol equation 3: glucose + pi → glucose-6-phosphate + h2o δg3 = + 3.3 kcal/mol equation 4: adp + pi → atp + h2o δg3 = + 7 kcal/mol?

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  1. 14 September, 13:43
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    I believe the most appropriate equations are 1 and 3; that is

    ATP + H2O = ADP + Pi ΔGI = - 7 kcal/mol and

    Glucose + Pi = Glucose-6-phosphate + H2O ΔG3 = + 3.3 kcal/mol

    Reaction coupling is a strategy used by cells in which an energetically favorable reaction such as hydrolysis of ATP is directly linked with an energetically unfavorable reaction.
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