👉 Photophosphorylation is a biological process where light energy is used to phosphorylate specific proteins or nucleic acids. This process occurs in several different types of cells, including Eukaryotic cells and some prokaryotic organisms like bacteria. In this process, light-dependent reactions (like photosynthesis) are catalyzed by the enzyme phosphoribosyltransferase. The light energy is used to transfer a phosphate group from the light molecule (usually ATP or NADP+)