The dissociation constant of this drug has the receptor of 15nM. 
What is a drug receptor?
The macromolecules known as receptors play a role in chemical signalling within and between cells. 
- They can be found on the cell surface membrane or in the cytoplasm (see table Some Types of Physiologic and Drug-Receptor Proteins).
-  Receptor activation controls cellular biochemical processes directly or indirectly (eg, ion conductance, protein phosphorylation, DNA transcription, enzymatic activity).
The term "ligand" refers to a molecule that binds to a receptor, such as medication, hormone, or neurotransmitter. 
- The binding may be reversible and particular. 
- A receptor can be activated or inactivated by a ligand; activation can change how well cell functions. 
- Each ligand may interact with different subtypes of receptors. 
- Few, if any, medications exhibit 100% selectivity for a single receptor or subtype, but the majority do.
Learn more about receptors here, 
https://brainly.com/question/11985070
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