The free energy change of hydrolysis of sucrose into glucose and fructose is ΔG = - 7
kcal/mol. When the enzyme sucrase is added to the reaction mixture, what happens to the ΔG of the reaction?

Question

BlackTom AI · Accepted Answer

Question restatement: The free energy change of hydrolysis of sucrose into glucose and fructose is ΔG = -7 kcal/mol. When the enzyme sucrase is added, what happens to the ΔG of the reaction?

Option a: 'The ΔG is decreased' — This is incorrect. A catalyst like an enzyme lowers the activation energy barrier, not the overall free energy change of the reaction. The thermodynamics (ΔG) are determined by the difference in energy between reactants and products, not by catalysts.

Option b: 'The ΔG is increased' — This is incorrect for the same fundamental reason as above: enzymes do not alter the thermodynamic favorability (ΔG) of the reaction; they affect kinetics, not the equilibrium free energy.

Option c: 'The ΔG remains the same' — This is correct. Enzymes accelerate the rate of the reaction by stabilizing transition states and lowering the activation energy, but they do not change the overall ΔG of hydrolysis. The energetics from reactants to products stay the same (−7 kcal/mol in this case).

Option d: 'The ΔG is equal to the activation energy of sucrase' — This is incorrect. ΔG and the activation energy (Ea) are distinct concepts: ΔG is the change in free energy from reactants to products, while Ea is the energy barrier to reach the transition state. An enzyme lowers Ea but does not set ΔG to Ea.

Summary: Enzymes modify reaction rates by lowering activation energy without altering the intrinsic thermodynamics of the reaction, so the only option that aligns with this is that the ΔG remains the same.

The free energy change of hydrolysis of sucrose into glucose and fructose is ΔG = - 7 kcal/mol. When the enzyme sucrase is added to the reaction mixture, what happens to the ΔG of the reaction?单项选择题

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The free energy change of hydrolysis of sucrose into glucose and fructose is ΔG = - 7 kcal/mol. When the enzyme sucrase is added to the reaction mixture, what happens to the ΔG of the reaction?单项选择题

类似问题

The Gibbs free energy for Step 3 of glycolysis, is ∆G = –5.3 kcal/mole. In terms of energy changes, how would you classify this reaction?

The ∆Gº is a _______________ value often written in textbooks. The _______________ is used in cellular conditions because varying temperature and a high amount of _______________ may make even a ______________ ∆Gº reaction spontaneous. (overthrowing the natural favorability/non-favorability).

During a laboratory experiment, you discover that an enzyme-catalyzed reaction has a deltaG of -20kcal/mol. If you double the amount of enzyme in the reaction, what will be the deltaG for the new reaction?

The transaminase transfer of an amine group from alanine to α-ketoglutarate to form pyruvate and glutamate has a change in Gibb’s free energy (ΔG) of 1.9 kJ/mol. What does this ΔG value tell you about the reaction?

The de-phosphorylation of phosphoenolpyruvate (PEP) to form pyruvate has a change in Gibb’s free energy (ΔG) of -61.9 kJ/mol. How would you describe the reaction?

The transaminase transfer of an amine group from alanine to α-ketoglutarate to form pyruvate and glutamate has a change in Gibb’s free energy (ΔG) of 1.9 kJ/mol. What does this ΔG value tell you about the reaction?

更多留学生实用工具

希望你的学习变得更简单

The ∆Gº is a _______ value often written in textbooks. The _ is used in cellular conditions because varying temperature and a high amount of _ may make even a ______ ∆Gº reaction spontaneous. (overthrowing the natural favorability/non-favorability).