Metabolic pathways
Catabolism
Anabolism/biosynthesis
Catabolism
Primarily energy producing
Breaking down
Anabolism
Primarily energy using
Building up
Endergonic reactions
Requires energy
Non-spontaneous
Increase Gibbs free energy (>0)
Exergonic reactions
Releases energy
Spontaneous
Decrease in Gibbs free energy (<0)
Energy coupling
The use of energy released in one reaction is used to drive another reaction