Mica Piro Chapter 11: Cell Communication External Signals are Converted to Responses Within the Cell (11.1) Evolution of Cell Signaling One topic of sell ?conversation? is sex?a type of yeast cell identify their mates by chemical signaling 2 sexes: a and ? Each type secretes a specific factor that binds to receptors only on the other type of cell When exposed to each other?s mating actors, a pair of cells of opposite type change shape, grow toward each other, and fuse/matethe new a/? cell contains all the genes of both original cells Once received by the yeast cell surface receptor, a mating signal is changed, or transduced, into a form that brings about the response of mating, which occurs in a series of steps called a signal transduction pathway