In addition surrounding the. ATP synthase complex F o F 1-ATP synthase. Diagram Of A Chloroplast Inside A Cell Showing Thylakoid Stacks Photosynthesis Cell Cell Wall Singer and Garth Nicolson developed the fluid mosaic model to describe biological membranes. . Cell depolarization or membrane depolarization is a process that shifts the electrical charge distribution so that the cell is less negatively charged compared to the environment. At the heart of a photosystem lies the reaction center which is an enzyme that uses light to reduce and oxidize molecules give off and take up electrons. Reaction centers are multi-protein complexes found within the thylakoid membrane. Yagi Studio Getty Images Good work. These reactions take place on the thylakoid membrane inside the chloroplast. Plasma Membrane Proteins. These reactions occur when the pigment chlorophyll. ATP is created when hydrogen ions are pumped into t