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).
Two of the phosphates are easily broken down to release energy and are added in a covalent bond during processes like respiration. ATP is the source for driving active transport and reactions like cellular respiration and photosynthesis. ATP is broken down by hydrolysis. This results in adenosine diphosphate and an inorganic phosphate. Along with this comes the release of energy which can be used all through-out the system. Taking this step one further you can produce AMP, which contains only one phosphate group.