Cells can manipulate the free energy of reactions by: (select all that apply)
changing the concentrations of products and reactants
changing the concentration of the enzyme involved in the reaction
using enzymes
a. lowering the activation barrier of a reaction
b. coupling an unfavorable reaction with a favorable one
c. inhibiting or activating an enzyme involved in the reaction

The correct answers are given below

Explanation:

Cells can manipulate the free energy of reaction by changing the concentration of product and reactant.This is because the free energy of a chemical or biochemical reaction depends on equilibrium constant of that reaction and the equilibrium constant inturn depends on the concentration of both reactant and product.

Using enzymes A lowering the activation barrier of a reaction.Enzymes act as biological catalyst by lowering the energy barrier called activation energy of a reaction but does not have any effect on the reaction"s equilibrium.

the answer is true.