what happens when an agonist, instead of the endogenous (natural) hormone binds to the hormone recepters of a target. A. an antagonist is necessary to remove the agonist B. the agonist blockd any response in the target cell C. the cell responds by producing its own hormone D. transcription factors are blocked from binding to the promotor region E. the agonist has the same effect as the endogenous hormone.

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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.