【单选题】Two proteins bind to the same ligand, and protein A has half of its binding sites occupied when the ligand concentration is 0.5 mM, while protein B has half of its binding sites occupied when the liga...
A.
Protein A binds more strongly, and K d = 0.3 mM.
B.
Protein A binds more strongly, and K d = 0.5 mM.
C.
Protein B binds more strongly, and K d = 0.3 mM.
D.
Protein B binds more strongly, and K d = 0.5 mM.
E.
Both proteins bind the ligand with the same affinity, and K d = 0.4 mM.