Golgi complex is the organelle that modifies proteins before they are either used by the cell or transported out of the cell.
Explanation;
Golgi complex is also called golgi apparatus or golgi bodies; is made up of membrane-bound sacs .
Its function is to process and bundle macromolecules like proteins and lipids as they are synthesized within the cell. That is; modifying, sorting and packaging of proteins for secretion.
Additionally; it is also involved in the transport of lipids around the cell, and the creation of lysosomes.
Enzymes lower the activation energy, making life possible to occur as the reactions can happen quickly. But, they can be affected by temperature or pH, and they are always being constantly reused over and over in reactions.