Two Receptors,A and B,can Bind the Same Chemical Signaling Molecules

Multiple Choice

Two receptors,A and B,can bind the same chemical signaling molecules but the concentration of those molecules required to reach 50% saturation is twice as great for receptor B.Therefore,the receptors have the same ________,but different ________.

A) specificity;affinity
B) specificity;saturation
C) affinity;specificity
D) affinity;competition
E) competition;affinity