For a receptor to be highly specific for its ligand, the binding affinity must be high. Which of the following is TRUE regarding high binding affinity?
a. The lower the Kd, the greater the binding affinity.
b. The higher the Kd, the greater the binding affinity.
c. Think about the relationship between Kd and binding affinity.
d. The lower the Ka, the greater the binding affinity.
e. If the Kd is equal to zero, the binding affinity is at its greatest.