A virus uses theon the outside of its body to unlock and enter our cells. This object on the outside is also known as an antigen and can be identified by the immune system to fight the virus in the future.

antibodies

Explanation:

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