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【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 ligand concentration is at 0.3 mM. Which protein binds the ligand more strongly, and what is the dissociation constant for that protein-ligand interaction?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.
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