Cell to cell communication is essential for multi-cellular organisms, such as human beings and oak trees, in order to coordinate their activities enabling the organism to develop. Cell communication is essential for unicellular organisms as well. The networking of these cells is very complicated. Chemical signaling is the most common mode of communication between cells. Studies suggest that identification of cells is done by chemical signaling in the cells of yeast,Â Saccharomyces cerevisiae. These cells are of two types a andÂ aÂ and secrete factor a and factorÂ aÂ respectively. These factors attract each other resulting in the fusion of two opposite cells. All the genes of both the original cells are transferred into the new cell. A signal on a cellâ€™s surface is transformed into a particularÂ cellular responseÂ in a sequence of responses referred to asÂ a signal transduction pathwayÂ (Recce, 2005). The molecular details of signal transduction in yeast and mammals are very similar. These and other resemblances between signaling systems in bacteria and plants propose that premature versions of the cell-signaling mechanisms advanced well before earth saw its first multi-cellular organism. Scientists believe that they first evolved into ancient prokaryotes and eukaryotes and were later used for new purposes by their multi-cellular descendants.
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