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Rating Newest Oldest. Best Answer: In biochemistry, a receptor is a protein molecule, embedded in either the plasma membrane or cytoplasm of a cell, to which a mobile signaling (or signal) molecule may attach.
1 Binding of the signal molecule to the receptor protein will activate intracellular signaling proteins that initiate a signaling cascade. 2  Target proteins: the conformations or other properties of the target proteins are altered when a signaling pathway is active and changes the behavior of the cell. protein-coupled receptors comprise a large protein family of transmembrane receptors. They are found only in eukaryotes. The ligands which bind and activate these receptors include: photosensitive compounds, odors, pheromones, hormones, and neurotransmitters.