BIOL 1F90 Lecture Notes - Lecture 21: Ferredoxin, P700, Chemiosmosis
11 Nov 2017
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An absorption spectrum depicts the wavelengths of light absorbed by different pigments: wavelengths that are not absorbed are reflected and give the plant its colour. Rate of photosynthesis at specific wavelengths is depicted by an action spectrum: highest at the wavelengths absorbed by chlorophylls and carotenoids. Thylakoid membranes contain two distinct complexes of proteins and pigment molecules: photosystem ii (psii), which is connected by an electron transport chain 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. Both photosystems have two main components: light-harvesting complex, reaction centre. Electrons transfer from psii to an electron transport chain in the thylakoid membrane. Electron transfers release some energy that is used to pump h+ into the thylakoid lumen. 2013 mcgraw-hill ryerson ltd. all rights reserved.
