Question: how many chlorophyll molecules are stored in a single photosystem?
Answer: Photosynthesis in green plants is mediated by two kinds of membrane-bound, light-sensitive complexes—photosystem I (PS I) and photosystem II (PS II). Photosystem I typically includes 13 polypeptide chains, more than 60 chlorophyll molecules, a quinone (vitamin K1), and three 4Fe-4S clusters.