A receptor has a Kd for its ligand of 50 nM. This receptor
a) has a higher affinity for its ligand than does a receptor with a Kd of 100 nM.
b) has a higher affinity for its ligand than does a receptor with a Kd of 10 nM.
c) is mostly bound by its ligand when the ligand concentration is 100 nM.
d) must be an intracellular receptor.
e) both a and c are true of this ligand.
Answer: E