P700, or Photosystem I, (where P stands for pigment) is the reaction-center chlorophyll a molecule in association with photosystem I. A photosynthetic reaction center is a complex of three types of protein that is the site where molecular excitations originating from sunlight are transformed into a series of electron-transfer Chlorophyll is a green Pigment found in most Plants Algae and Cyanobacteria. Photosystems (ancient Greek: phos = light and systema = assembly are Protein complexes involved in Photosynthesis. Its absorption spectrum peaks at 700 nm. A material's absorption spectrum shows the fraction of incident Electromagnetic radiation absorbed by the material over a range of Frequencies. When photosystem I absorbs light, an electron is excited to a higher energy level in the P700 chlorophyll. A quantum mechanical system or particle that is bound, confined spacially can only take on certain discrete values of energy as opposed to classical particles which The resulting P700 with excited electron is designated P700*. The electron is subsequently captured by the primary electron acceptor. Type I photosystems use ferredoxin-like iron-sulfur cluster proteins as terminal electron acceptors. Ferredoxins (from Latin ferrum: Iron + Redox, often abbreviated "fd" are Iron-sulfur proteins that mediate Electron Photosystem I is more complex than photosystem II (P680), as it has a more complex antenna system, has more subunits in its overall structure, and may exhibit cyclic or non-cyclic electron transfer from the excited P700* to the electron acceptor. P680, or Photosystem II primary donor, (where P stands for pigment is a group of pigments associated with Photosystem II and consists of 4 chlorophyll ''a''
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