Biology 1002B Lecture Notes - Lecture 2: Chlamydomonas, Gel Electrophoresis, Heat Shock Protein
19 Dec 2017
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Relationship between pigments and associated protein: pigments are never free, they are always bound to a protein, ex. Channelrhodopsin= pigment retinal is bound to the protein opsin: photoreceptor requires pigment and protein. Four (cid:498)fates(cid:499) of the excited state of chlorophyll resulting from absorption of photons: electron will loose heat. Relationship between energy of photon and electron excited states to explain pigment colour and absorption spectrum: when an electron looses energy it drops from a higher excited state to a lower excited state and vice versa. & photosynthesis: photochemistry is using the energy of an electron to drive a photochemical change. (ex. Oxidize a molecule): energy transfer is not oxidation/reduction. Transfer energy not an electron: photochemistry in phototransduction the chemical event is switching from cis to trans or trans to cis (isomerization of retinal, photochemistry in photosynthesis, chemical event is oxidization of chlorophil, these are both photochemical events.
