(Solved): The dissociation constant Kd is the ligand concentration required to bind 50% of the cell surfac ...

The dissociation constant $K_d$ is the ligand concentration required to bind $50\%$ of the cell surface receptors. Which of the following statements about $K_d$ is true? A. $K_d$ increases as receptor ligand binding increases. B. $K_d$ decreases as receptor ligand binding increase. C. The higher the $K_d$ the higher the ligand concentration required to occupy $50\%$ of the cell surface receptors. D. The higher the $K_d$ the higher the ligand concentration required to occupy $100\%$ of the cell surface receptors.