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The hydrolysis of ATP to ADP + Pi and that of ADP to AMP + Pi have deltaGo, values of -7.3 kcal/mol and -3.4kcal/mol respectively. Give three reasons that account for the large differences between the two delta G0 values.

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Jamar Ferry
Jamar FerryLv2
28 Sep 2019

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Related questions

The ATP:ADP:Pi ratio is tightly controlled in cells, but the concentrations can differ between cell types. Fill in the Table below, providing DeltaG for the hydrolysis of ATP to ADP and Pi for the two cell types below at 37 degrees celcius using the concentrations give. Show your work.

(B) Considering the numbers you inserted in the tabler, what effect would physiological conditions have on the overall deltaG for the reaction?

Tissue ATP (mM) ADP(mM) Pi (mM) Delta G (kj/mol
Muscle 8.0 0.9 8.0 ?
Liver 3.5 1.8 5.0 ?

1.) Glucose 6-Phosphate + H2O -> Glucose + Pi has a Keq of270. ATP + Glucose -> ADP + Glucose 6 phosphate has a Keq of 8 90. Using this information, calculate the standard free energy ofhydrolysis of ATP.

2.)The complete combustion of glucose to CO2 and H2O proceedswith an overall ΔG° of -686 kcal/mol. When this process occurs in atypical cell, 36 mol of ATP are produced from ADP and Pi.

Assuming that the ΔG for ATP <--> ADP + Pi is -10kcal/mol, and that ΔG° = ΔG for glucose oxidation under cellularconditions, what fraction of the potential energy of glucose isconserved as chemical bond energy in ATP?

What happens to the energy not conserved as ATP bond energy?

In considering active transport by Na+ -K+ -ATPase at body temperature (37o C), 3 Na+ are pumped out of the cell and 2 K+ are pumped in for each ATP that is hydrolyzed to ADP + Pi. Given that under your experimental conditions, the ΔG for ATP hydrolysis is -10 kcal/mol, and that V is -60 mV, and that the pump maintains the internal Na+ at 10mM, external Na+ at 120 mM, internal K+ at 120 mM and external K+ at 8mM, what is the efficiency of the pump (i.e., what fraction of the energy available from ATP hydrolysis is required to drive transport at the provided levels)?

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