BIOL 113 Chapter Notes - Chapter 11: Glycogen Phosphorylase, Signal Transduction, Mating Of Yeast
8 Jan 2018
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Cellular messagi(cid:374)g: cells signal each other & interpret signals they get from other cells & the environ. E(cid:448)olutio(cid:374) of (cid:272)ell sig(cid:374)ali(cid:374)g: cells communicate about sex, cells of unicellular yeast saccharomyces cerevisiae (used it make bread, wine, beer) identifying sexual mates by chemical signaling. So cells can mate w/ each other but no parent population. Example: bacteria cells secrete molecules that can be detected by other bacteria cells: quorum sensing: sensing the concentration of signaling molecules allows bacteria to monitor their local cell density. Allows bacterial pop to coordinate behaviors in activities that require a given # of cells: example: formation of a biofilm - aggregation of bacterial cells adhered to a surface https://onedrive. live. com/view. aspx?resid=c5310d6a66e98d52!121&app=onenote&authkey=!apqq1udavatjxly. Onenote online: cells often derive nutrition from the surface they are on, example: secretion of toxins by infectious bacteria, sometimes antibiotics don"t work due to antibiotic resistance that evolved in a specific strain of bacteria.
