What is the function of enzymes?
Enzymes are macromolecules that help metabolic pathways to take place inside the cell and under the conditions of the cell in terms of heat and pressure.
The chemical reactions require conditions like high temperature and/or pressure that may not be found in a cell, so enzymes help the reaction to take place though these conditions are not available.
Enzymes do so by lowering the activation energy needed to start the reaction.
Enzymes are usually protein molecules that have a dent. In this dent the materials to react fit and the enzymes starts pressing on them. The reaction takes place as a result.
Another function of the enzymes is that they control the amount of energy released by the reaction, as this reaction happens in a step-wise manner so no explosions take place inside the cell.