Question

Glycolysis is the process by which energy is harvested from glucose by living things. Several of the reactions of glycolysis are thermodynamically unfavorable (nonspontaneous), but proceed when they are coupled with other reactions. Which of these reactions is(are) unfavorable? Select all that apply.

(A) P1 + Glucose → Glucose-6-phosphate + H2O ΔG⁰= 3.30 kcal/mol
(B) P1 + Fructose-6-phosphate → Fructose-1.6-biphosphate + H2O ΔG⁰=3.9 kcal/mol
(C) ATP + H2O → ADP + P1 ΔG⁰=-7.30 kcal/mol

Answer 1

Reaction A and B are unfavorable.

Step-by-step explanation:

Gibbs free energy is an energy which that can be use to convert into useful work.

ΔG°=ΔH°-TΔS°

ΔG°= Gibbs free energy

ΔH° = enthalpy of reaction

T = temperature of eh reaction

ΔS° = Entropy change

• If the Gibbs free energy of the reaction is positive than the reaction will be non spontaneous and the chemical reaction will be not feasible.
• If the Gibbs free energy of the reaction is negative than the reaction will be spontaneous and the chemical reaction will be feasible .

According to given information in the question:

Reaction A and B are non spontaneous as their Gibbs free energy value is positive.hence both are unfavorable.