What do the enzymes inside a cell do?

Even the tiniest microscopic bacteria cell can have about 1,000 enzymes at work inside.  Enzymes are what make all the chemical reactions in the cell possible.  The human body is made up of trillions of cells, and there are different cells for different functions.  Cells are little bundles of chemical reactions. They reproduce, they create energy, and they break molecules down and build them up. All that action going on is made possible by the enzymes. 

Enzymes are proteins inside the cells. They are formed by special chains of amino acids that come together in different shapes to do special jobs, like breaking down sugar and fat molecules or to make more enzymes. The cells need the enzymes to live, and each different enzyme has its own work to do.  When the body is missing a type of enzyme, the cells can't work properly. This can lead to problems for the person whose body is missing the enzymes.