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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.
CHAPTER 24 Plasma Membrane Receptors. Cells use about 20 different families of receptor proteins to detect and respond to the myriad of incoming chemical and physical stimuli (Appendix 24-1). Most receptors are plasma membrane proteins that interact with chemical ligands or are