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Title: Is photosystem I or II more important? Post by: plwebb1 on Oct 24, 2014 If so, why? Do they not do the same thing?
Title: Re: Is photosystem I or II more important? Post by: emhen on Oct 24, 2014 Photosystems are arrangements of chlorophyll and other pigments packed into thylakoids. Many Prokaryotes have only one photosystem, Photosystem II (so numbered because, while it was most likely the first to evolve, it was the second one discovered). Eukaryotes have Photosystem II plus Photosystem I. Photosystem I uses chlorophyll a, in the form referred to as P700. Photosystem II uses a form of chlorophyll a known as P680.
Title: Re: Is photosystem I or II more important? Post by: skip5284 on Oct 24, 2014 Photosystem I clusters boost electrons to a higher energy state by absorbing light with a wavelength of 700 nm (nanometers).
Photosystem II clusters do the same thing except with light that has a wavelength of 680 nm. So, they aren't necessarily the same thing :nerd: |