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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.
Cell surface receptors are integral membrane proteins and, as such, have regions that contribute to three basic domains: 1  Extracellular domains: Some of the residues exposed to the outside of the cell interact with and bind the hormone-another term for these regions is the ligand-binding domain.