Chapter 11 - Chapter11 CellCommunication LectureOutline...

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Chapter 11 Cell Communication Lecture Outline Overview: The Cellular Internet Cell-to-cell communication is absolutely essential for multicellular organisms. o Cells must communicate to coordinate their activities. Communication between cells is also important for many unicellular organisms. Biologists have discovered universal mechanisms of cellular regulation involving the same  small set of cell-signaling mechanisms. o The ubiquity of these mechanisms provides additional evidence for the evolutionary  relatedness of all life. Cells most often communicate by chemical signals, although signals may also take other  forms. Concept 11.1 External signals are converted to responses within the cell. What messages are passed from cell to cell? How do cells respond to these messages? Cell signaling evolved early in the history of life. One topic of cell “conversation” is sex. The cells of  Saccharomyces cerevisiae,  the yeast of bread, wine, and beer, identify potential  mates by chemical signaling. There are two sexes,  and  each of which secretes a specific signaling molecule,  factor and  factor, respectively. These factors each bind to receptor proteins on the other mating type. After 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 
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Chapter 11 - Chapter11 CellCommunication LectureOutline...

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