DRAW IT Draw the following apoptotic pathway, whichoperates in human immune cells. A death signal isreceived when a molecule called Fas binds its cell-surfacereceptor. The binding of many Fas molecules to receptorscauses receptor clustering. The intracellular regions of thereceptors, when together, bind proteins called adaptorproteins. These in turn bind to inactive molecules ofcaspase-8, which become activated and then activatecaspase-3. Once activated, caspase-3 initiates apoptosis.

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.