ry: Ch. 13, in-class exercise 1 Google Chrome gCh https:// on.masteringchemistry

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ry: Ch. 13, in-class exercise 1 Google Chrome gCh https:// on.masteringchemistry.com/myct/itemView?assignmentProblemID-67805230 Se Biochem 523 Sec01 F16 Ch. 13. in-class exercise 1 Problem 13.14 Problem 13.14 Aconitase catalyzes the reaction: citrate socit rate The standard free energy change, AG for this reaction is +6.3kJ/mol However the observed free energy change (AG) or this reaction in mammalian mitochondria at 25 C is 0 kJ/mol. Part A Calculate the ratio of [isocitrate]/[citrate] in mitochondria. Express your answer using two significant figures. isocitrate] citrate Submit My Answers Give Up Part B s this reaction likely to be a control point for the citric acid cycle? Why or why not? O Yes, because aconitase catalyzes an inreversible reaction O Yes, because citrate ion is a limiting reactant in citric acid cycle Yes, because AG is greater than 0. O No, because aconitase catalyzes a freely reversible reaction. O No, because aconitase catalyzes an inreversible reaction O No, because isomerisation proceeds slow compared to the following oxydation Submit My Answers Give Up

Explanation / Answer

A)

ratio for

[isocitrate]/[citrate]

dG = dG° + RT*ln(Q)

0 = 6300 + 8.314*298*ln(Q)

Q = exp(6300/(8.314*298))

Q = 12.715

[isocitrate]/[citrate] = Q= 12.715

B)

yesm because dG is greater than 0

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