Catalase is an enzyme found in liver. It is used to break down hydrogen peroxide, a waste product produced by cells. Determine what characteristic of an enzyme is exhibited in the following scenarios when 5 drops of water are placed on a piece of liver, nothing happens. Later 5 drops of hydrogen peroxide are placed on the liver, and it forms lots of bubbles?
1) Optimum pH
2) Optimum temperature
3) Reusable
4) Specific substrate