A solution containing proteins of a particular type is exposed to the same concentrations of ligands X and Y, but the percent saturation of molecule X is greater than the percent saturation of molecule Y. Which is most likely to be a true statement?
A. The binding sites for ligand X have greater specificity than the binding site for ligand Y.
B. The protein has a higher affinity for ligand X than for ligand Y.
C. Ligand X must be a competitive inhibitor of ligand Y.
D. Both ligands must bind to the same binding site on the protein.
E. The binding sites for ligand X are 100% saturated.
Answer: B
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