If a cell cannot produce the enzyme necessary for a specific metabolic reaction diseases may result and cell with not function properly.
Enzymes are organic catalysts that makes chemical reactions possible in cells. They are positive catalysts that helps to lower the activation barrier needed to start up a chemical reaction.
If an enzyme is not available for a metabolic reaction, the reaction will be halted and not proceed.
This can result in termination of a process that produces useful materials for the body.
The body generally lacks in this material which can result in malfunctioning of the body.