Endogenous Extracellular Molecules X and Y Both Bind to a Receptor

question 27

Multiple Choice

Endogenous extracellular molecules X and Y both bind to a receptor on the target cell. Binding of molecule X to the receptor results in changes in the cell's behavior. Binding of molecule Y does not result in changes in the cell's behavior. Which molecule can be called the ligand?

• A) only molecule X
• B) only molecule Y
• C) neither molecule X nor Y
• D) both molecules X and Y

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