Biology 1001A Lecture Notes - Lecture 4: Channelrhodopsin, Simple Eye In Invertebrates, Carotenoid
12 Apr 2018
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Chal(cid:455)(cid:373) uses the e(cid:455)espot to gather i(cid:374)for(cid:373)atio(cid:374) a(cid:271)out it"s e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t. A lot of eyespots in chloroplast have nothing to do with photosynthesis. Eyespot that links eyespot sensing with flagella movement is not found in the chloroplasts but is found in the plasma membrane (channelrhodopsins photo translucency) Light must be captured by channelrhodopsins molecules (light can bounce off the carotenoid layers and reflect into the channelrhodopsins) Rear side of carotenoid layer will block light coming from the chalmy cell is blocked from hitting channelrhodopsins (can orientate itself) Channelrhodopsins: light-gated ion channel allows specific ions (opens in the presence of light) Animal cells and chlamydomonas cells are polarized (requires energy to maintain) voltage different across the plasma membrane inside is negative and outside is positively charged. Depolarizing the membrane voltage difference is lower when channelrhodopsins is open (how neuron works causes action potential)
