Reaction steps that are far from equilibrium are good control points in metabolic pathways because:.a. the net flux through those steps is easily reversed. b. the rate differences between the forward and reverse steps are often small. c. these reactions are highly endergonic. d. these reactions are highly exergonic. e. these reactions occur most frequently in the cell.

Explanation:

1. Those reactions which are far from equilibrium are good control point in metabolic pathways because these reactions are highly exergonic.

2. Reactions are catalyzed by enzymes which increase the rate of reaction by decreasing the activation energy.

3. An exergonic reaction;  

i) is a reaction where the change in the free energy is always negative, ii) also that loses energy in the process of the reaction.