To answer questions 1-4, consult these values for hydrolysis of phosphorylated c

Question

To answer questions 1-4, consult these values for hydrolysis of phosphorylated compounds. phosphoenolpyruvate (PEP) pyruvate Pi -61.9 kJ/mol ATP ADP Pi -30.5 kJ/mol glucose-6-phosphate glucose P 13.8 kJ/mol creatine-phosphate creatine P -43.1 kJ/mol glycerol-3-phosphate glycerol Pi -9.7 kJ/mol 1,3-bisphosphoglycerate 3-phosphoglycerate P -49.0 kJ/mol Problem 1. (5 pts) The enyme hexokinase catalyzes the phosphorylation of glucose as the first step of glycolysis and is an example of a coupled reaction. What is the AG" for the phophorylation of glucose to glucose-6-P by hexokinase? Circle the correct answer. (a) -44.3 kJ/mol (b) 16.7 kJ/mol (c) 0.0 kJ/mol (d) +16.7 kJ/mol (e) +44.3 kJ/mol Problem 2 (5 pts) The enzyme pvruvate kinase is another good example of a coupled reaction and also

Explanation / Answer

phosphorylation of glucose to glucose 6 phosphate is a coupled reaction. since glucose to glucose 6 phosphate is not spontaneous and has delta G value 13.8 kJ/mol . To make it feasible another reaction which is hydrolysis of ATP is coupled with it . Delta G of this reaction is -30.5kJ/mol .

hence overall delta G is -30.5 +13.8 = -16.7kJ/mol .

hence the correct answer is option b .

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