Enzymes are a which speed up the rate of a reaction but are not used up or changed during the reaction. the enzyme lactase will speed up the reaction of braking down lactose.

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics

that is wrong, its not thymus.