BIOL-UA 11 Chapter : Cell Communication
Document Summary
Yeast cells use chemical signaling to identify cells of opposite mating type and initiate the. Signal transduction pathway conversion of a received signal into a specific cellular response through a series of steps. Similarities between signal transduction in yeast and mammals suggests that early versions of today"s cell-signaling mechanisms evolved well before the first multicellular creatures appeared on earth. The ability of a cell to respond to a signaling molecule depends on whether the cell has a specific receptor molecule that can bind to the signaling molecule. The cell-signaling process helps ensure that crucial activities occur in the right cells, at the right time, and in proper coordination with the activities of other cells of the organism. The signaling molecule is complementary in shape to a specific site on the receptor and. Ligand a molecule that specifically binds to another molecule (signaling molecules.
