Enzymes

In this picture you can see the fire from the burner, this fire acts as an enzyme to the water in the pan helping to speed up the process of boiling the water itself.

Made up of amino acids, these catalysts are essential for creating cells and speeding up chemical reactions. Enzymes are made up of many linked amino acids that work together to speed up the functions in a cell making it possible for that cell to regulate its' tasks in a unique and specific fashion. Different cells require different numbers of enzymes, but in order for that cell to continue to function there must be some form of enzyme activity allowing these cells to perform their functions.

Sources:
Brain, Marshall. How Cells Work. howstuffworks.com. Retrieved August 24, 2011, from http://science.howstuffworks.com/environmental/life/cellular-microscopic/cell2.htm