People who are infected with HIV do not get sick immediately. It can take the body months to attempt to fight off the virus and for a patient to test HIV-positive. So, paradoxically, the period when an HIV-positive person is most infectious coincides with the period he or she is least likely to know their status.
The ATP synthase of mitochondria and chloroplasts is an anabolic enzyme that harnesses the energy of a transmembrane proton gradient as an energy source for adding an inorganic phosphate group to a molecule of adenosine diphosphate (ADP) to form a molecule of adenosine triphosphate (ATP).
ATP is the enzyme that acts as the motor for the cell. ATP  generates the energy currency of the cell. The enzymes in the cell act as catalysts for chemical reactions.  They lower the activation energy of these reactions in order to  speed up the reaction rate. Enzymes are not transformed into new molecules after a  reaction.