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Unformatted text preview: of cell signaling. Cell signaling evolved early in the history of life. One topic of cell conversation is sex. Saccharomyces cerevisiae, the yeast of bread, wine, and beer, identifies potential mates by chemical signaling. There are two sexes, a and , each of which secretes a specific signaling molecule, a factor and factor, respectively. These factors each bind to receptor proteins on the other mating type. Once the mating factors have bound to the receptors, the two cells grow toward each other and undergo other cellular changes. The two cells fuse, or mate, to form an a/ cell containing the genes of both cells. The process by which a signal on a cells surface is converted into a specific cellular response is a series of steps called a signal-transduction pathway....
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- Fall '10