BIOL 1F90 Lecture Notes - Lecture 17: Photosystem Ii, P680, Photosystem I

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Thylakoid membranes contain two distinct complexes of proteins and pigment molecules: photosystem ii (psii), whi(cid:272)h is (cid:272)onne(cid:272)ted (cid:271)y an ele(cid:272)tron transport (cid:272)hain to , photosystem i (psi) Light energy captured by pigments can be transferred to other molecules to ultimately produce energy intermediates for cellular work: generated h+ gradient is used to synthesize atp, nadp+ is reduced to nadph. Both photosystems have two main components: light-harvesting complex. Contains pigment molecules (e. g. chlorophyll) that directly absorb photons of light. Absorption boosts an electron to a higher energy level. Energy is transferred to adjacent pigment molecules by resonance energy transfer, until reaching the reaction centre: reaction centre. Energy is transferred to a form of chlorophyll a called p680, converting it to. A high energy electron is quickly transferred from p680* to a primary electron acceptor (stable), yielding p680+ Missing electron is replaced with a low-energy electron from water.

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