If the ΔG°′ for the conversion of glucose-6-phosphate to glucose-1-phosphate is 7.5 kJ/mol at 25°C, what is the Keq for the reaction?
A. |
2.1 × 10–16 |
|
B. |
4.8 × 10–2 |
|
C. |
21 |
|
D. |
4.7 × 1015 |
|
E. |
None of the answers is correct. |
If the ΔG°′ for the conversion of glucose-6-phosphate to glucose-1-phosphate is 7.5 kJ/mol at 25°C, what...
The ΔG°′ for the conversion of glucose-1-phosphate (G1P) to glucose-6-phosphate is -7.1 kJ/mol. What is the ratio of the concentration of G6P to the concentration of G1P that provides a free energy change of –2.0 kJ · mol–1 at 37°C. [Express your answer in decimal form using 2 significant figures.]
The second step of glycolysis is the conversion of glucose-6-phosphate to fructose-6-phosphate. What is the ΔG for this reaction at 25oC, when the glucose-6-phosphate] is 60 mM and the [fructose-6-phosphate] is 40 mM. Note: the ΔGo’ for this reaction is +1.7 kJ/mol (at 25oC). 0.780 kJ/mol 1.26 kJ/mol 1.47 kJ/mol 2.70 kJ/mol 0.695 kJ/mol 2.62 kJ/mol Answer not listed
Part 1 (2 points)See Hint (A) Phosphorylation of glucose to produce glucose-6-phosphate has ΔG˚' = ? kJ/mol without the use of ATP. (B) Coupling phosphorylation with ATP hydrolysis gives ΔG˚' =? kJ/mol. Part 2 (1 point) Using concentrations of intermediates found in a cell, the phosphorylation of glucose using inorganic phosphate has ΔG' = 19.7 kJ/mol, while phosphoryl transfer from ATP (ATP investment) results in ΔG' = -34.5 kJ/mol. What does this tell you about the values of Q and...
During glycogen degradation glucose-1-phosphate is converted to glucose-6-phosphate and is an example of a coupled reaction. If the phosphoryl group transfer potential for glucose-1-phosphate is -20.9 kJ/mol and for glucose-6-phosphate is -13.8 kJ/mol, then what is the Keq (K) at 298 K? Is the conversion of glucose-1-phosphate to glucose-6-phosphate favorable or unfavorable under standard conditions? ΔG° = -RT ln K where R = 8.315 x 10-3 kJ/mol*K K = 0.057 and the reaction is unfavorable. K = 17.5 and the...
5.The following reaction has a ΔG°'--61.9 kJ/mol at 25°C, Phosphoenolpyruvate (PEP) +H2O Pyruvate + Inorganic Phosphate (Pi) (a) Is the reaction favorable under standard biochemical conditions? Explain your answer. (b) What is the equilibrium constant (K) of this reaction at 25°C? In cells the direct hydrolysis of PEP rarely occurs. Rather, the hydrolysis of PEP and the reverse hydrolysis of ATP are coupled (c) w rite out the coupled reaction and determine its ΔG at 25°C The hydrolysis of ATP...
The value of ΔG°\' for the conversion of dihydroxyacetone phosphate to glyceraldehyde-3-phosphate (GAP) is 7.53 kJ/mol. If the concentration of dihydroxyacetone phosphate at equilibrium is 2.65 mM, what is the concentration of glyceraldehyde-3-phosphate? Assume a temperature of 25.0 °C. The constant R = 8.3145 J/(mol·K) [GAP] = ??? mM
The enzyme hexokinase catalyzes the following reaction: Glucose + ATP ↔ Glucose 6-phosphate + ADP For this reaction, ΔG° = +16.7 kJ/mol a. Calculate the equilibrium constant for this reaction at 25 °C. Is this reaction spontaneous under standard conditions at this temperature? Calculate the ΔG if the reaction temperature was 25 °C and the concentrations are: glucose, 55.0 mM,; ATP, 5.00 mM; ADP, 1.00 mM; and glucose 6-Phosphate, 0.100 mM. Would the reaction be spontaneous under the conditions of...
The hydrolysis of glucose-1-phosphate to glucose and phosphate has a DG°’ of -20.9 kJ/mol. What is the DG when [G1P] = 5 mM, [Glucose] = 7.5 mM and [Pi] = 2500 mM?
Consider these hypothetical chemical reactions: A⇌B,ΔG= 13.7 kJ/mol B⇌C,ΔG= -27.2 kJ/mol C⇌D,ΔG= 6.20 kJ/mol What is the free energy, ΔG, for the overall reaction, A⇌D? Express your answer with the appropriate units. ΔG = Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP. In this way, luciferase can test for the presence of life. The coupled reactions...
The formation of glucose-1-phosphate from glucose and orthophosphate has a G of + 20.9 kJ/mol. If this reaction were coupled to another reaction in order to produce an exergonic reaction, which of the following would produce an overall endergonic reaction and therefore not be suitable for coupling? A) creatine phosphate + H2O creatine + Pi B) AMP + H2O adenosine + Pi C) ATP + H2O AMP + PPi D) ATP + H2O ADP + Pi...