Final answer:
The subjects mentioned in the question are related to cellular respiration and photosynthesis processes in biology.
Step-by-step explanation:
The subjects mentioned in the question are all related to cellular respiration and photosynthesis processes in biology. PSI and PSII are photosystems involved in photosynthesis, while the electron transport chain is a series of molecules that transfer electrons during cellular respiration. ATP synthase is an enzyme that synthesizes ATP, the energy currency of cells. These topics are important in understanding how cells generate energy and the role of light in photosynthesis.