Question: what is the difference between p680 and p700

title: P700
text: P700 , or photosystem I primary donor , ( where P stands for pigment ) is the reaction - center chlorophyll a molecule in association with photosystem I. Its absorption spectrum peaks at 700 nm . When photosystem I absorbs light , an electron is excited to a higher energy level in the P700 chlorophyll . The resulting P700 with excited electron is designated P700 * , and is the strongest biological reducing agent ( in contrast to P680 of photosystem II , the strongest biological oxidizing agent ) . The electron is subsequently captured by the primary electron acceptor . Type I photosystems use ferredoxin - like iron - sulfur cluster proteins as terminal electron acceptors . 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 . 

Answer: answer: P700, or 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.
answer: P700, or 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. The resulting P700 with excited electron is designated P700 * , and is the strongest biological reducing agent ( in contrast to P680 of photosystem II , the strongest biological oxidizing agent ) .