During the production of the amino acid tryptophan, the final product (tryptophan) slows the process when it is found in high levels (high supply, low demand) in the cell by binding to an enzyme in the metabolic pathway. When tryptophan is at low levels in the cell (low supply, high demand), it is released from the enzyme and the production process increases. This is an example of positive feedback  irreversible inhibition  competitive inhibition  feedback inhibition  noncompetitive inhibition

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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.