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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.
A signaling molecule. The term ligand is used for a molecule that specifically binds to another molecule, often a larger one. Ligand binding generally causes a receptor protein to undergo a change in shape.For many receptors, this shape change directly activates the receptor, enabling it to interact with other cellular molecules.For other kinds of receptors, the immediate effect of a ligand binding is to cause the aggregation of two or more receptor molecules, which leads to further molecular events inside the cell.or many receptors, this shape change directly activates the receptor, enabling it to interact with other cellular molecules. For other kinds of receptors, the immediate effect of a ligand binding is to cause the aggregation of two or more receptor molecules, which leads to further molecular events inside the cell.