4. Phosphocreatine is used by your muscle cells to store some energy. The dephos

Question

4. Phosphocreatine is used by your muscle cells to store some energy. The dephosphorylation of phosphocreatine, like that of ATP, is a highly exergonic reaction (see below) Phosphocreatine + HsO = creatine + Pi ATP + Hz= ADP + Pi dGo,--10.3 kcal/mol Gor -7.3 kcal/mol Part A: Write the single coupled reaction from the two above reactions which would result in an overall exergonic reaction. (3 pts) Part B: What is the Ge for the coupled reaction you wrote above? (2 pts) Part C: Without calculating it, what can you say about the K'e for the coupled reaction? (2 pts) Part D: The stores of ATP in your muscle cells provide energy for about 3 sec, whereas stores of phosphocreatine may provide energy for about 15 sec. In what form is the bulk of energy stored in muscle? Why? (3 pts)

Explanation / Answer

A. Phosphocreatine+ Water +ATP ----> Creatine +ADP+ Pi

B. The dGo' value is -(10.3+7.3)kcal/mol = -17.6kcal/mol

C.If the value of dGo' is high , then Keq tends to be high.

D. Energy is stored in the muscle in creatine phosphate form. It is utilized when there is faster requirement of energy.

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