Biology 1002B Study Guide - Midterm Guide: Channelrhodopsin, Biological Pigment, Visual Phototransduction
11 Feb 2018
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Document Summary
Basic organization and functional features of the eyespot: the carotenoid granule layers block light that come from the back side, the plasma membrane converts light to information. Key aspects of phototransduction [from light hitting eyespot through flagella movement: there are 7 transmembrane proteins, rhodopsin is not the gated channel is chlamydomonas. Photophysics of light absorption [excited states, decay: when an electron is at a higher excited state, heat is lost, when an electron is at ground state, it absorbs red light. The colour of a pigment reveals about its excited states: certain pigments absorb better at certain wavelengths. Mechanism of photoisomerization of retinal and its consequences. It causes a change in retinal: changes the shape of pigment. Correct interpretation of the term homology: shared ancestry between a pair of structure, genes, or different taxa. Distinction between photochemistry as it occurs in eyes and eyespots compared to how it occurs within a photosystem in photosynthesis: difference in structure.
